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📁 ..
📄 Sine-1000Hz-300ms.aif(60.25 KB)
📄 __init__.py(47 B)
📄 __main__.py(41 B)
📁 __pycache__
📄 _test_multiprocessing.py(183.09 KB)
📄 allsans.pem(9.87 KB)
📄 ann_module.py(1.08 KB)
📄 ann_module2.py(519 B)
📄 ann_module3.py(448 B)
📁 audiodata
📄 audiotest.au(27.48 KB)
📄 audiotests.py(12.46 KB)
📄 audit-tests.py(8.9 KB)
📄 autotest.py(209 B)
📄 bad_coding.py(24 B)
📄 bad_coding2.py(30 B)
📄 bad_getattr.py(61 B)
📄 bad_getattr2.py(77 B)
📄 bad_getattr3.py(139 B)
📄 badcert.pem(1.88 KB)
📄 badkey.pem(2.11 KB)
📄 badsyntax_3131.py(32 B)
📄 badsyntax_future10.py(95 B)
📄 badsyntax_future3.py(172 B)
📄 badsyntax_future4.py(153 B)
📄 badsyntax_future5.py(184 B)
📄 badsyntax_future6.py(161 B)
📄 badsyntax_future7.py(196 B)
📄 badsyntax_future8.py(122 B)
📄 badsyntax_future9.py(142 B)
📄 badsyntax_pep3120.py(14 B)
📄 bisect_cmd.py(4.85 KB)
📄 bytecode_helper.py(1.56 KB)
📁 capath
📄 cfgparser.1(67 B)
📄 cfgparser.2(19.02 KB)
📄 cfgparser.3(1.55 KB)
📁 cjkencodings
📄 clinic.test(94.65 KB)
📄 cmath_testcases.txt(141.05 KB)
📄 coding20731.py(22 B)
📄 curses_tests.py(1.22 KB)
📁 data
📄 dataclass_module_1.py(837 B)
📄 dataclass_module_1_str.py(835 B)
📄 dataclass_module_2.py(756 B)
📄 dataclass_module_2_str.py(754 B)
📄 dataclass_textanno.py(126 B)
📄 datetimetester.py(239.84 KB)
📁 decimaltestdata
📄 dis_module.py(76 B)
📄 doctest_aliases.py(240 B)
📄 double_const.py(1.18 KB)
📁 dtracedata
📁 eintrdata
📄 empty.vbs(70 B)
📁 encoded_modules
📄 exception_hierarchy.txt(1.78 KB)
📄 ffdh3072.pem(2.16 KB)
📄 final_a.py(411 B)
📄 final_b.py(411 B)
📄 floating_points.txt(15.92 KB)
📄 fork_wait.py(2.53 KB)
📄 formatfloat_testcases.txt(7.45 KB)
📄 future_test1.py(229 B)
📄 future_test2.py(149 B)
📄 gdb_sample.py(153 B)
📄 good_getattr.py(198 B)
📄 idnsans.pem(9.71 KB)
📄 ieee754.txt(3.21 KB)
📁 imghdrdata
📄 imp_dummy.py(63 B)
📄 inspect_fodder.py(1.88 KB)
📄 inspect_fodder2.py(2.06 KB)
📄 keycert.passwd.pem(4.13 KB)
📄 keycert.pem(3.96 KB)
📄 keycert2.pem(3.98 KB)
📄 keycert3.pem(9.23 KB)
📄 keycert4.pem(9.24 KB)
📄 keycertecc.pem(5.5 KB)
📁 libregrtest
📄 list_tests.py(16.54 KB)
📄 lock_tests.py(28.26 KB)
📄 mailcap.txt(1.24 KB)
📄 make_ssl_certs.py(9.25 KB)
📄 mapping_tests.py(21.75 KB)
📄 math_testcases.txt(23.19 KB)
📄 memory_watchdog.py(859 B)
📄 mime.types(47.37 KB)
📄 mock_socket.py(3.53 KB)
📄 mod_generics_cache.py(1.13 KB)
📄 mp_fork_bomb.py(448 B)
📄 mp_preload.py(351 B)
📄 multibytecodec_support.py(14.17 KB)
📄 nokia.pem(1.88 KB)
📄 nosan.pem(7.54 KB)
📄 nullbytecert.pem(5.31 KB)
📄 nullcert.pem(0 B)
📄 outstanding_bugs.py(370 B)
📄 pickletester.py(135.99 KB)
📄 profilee.py(2.97 KB)
📄 pstats.pck(65.05 KB)
📄 pycacert.pem(5.53 KB)
📄 pycakey.pem(2.43 KB)
📄 pyclbr_input.py(648 B)
📄 pydoc_mod.py(713 B)
📄 pydocfodder.py(6.18 KB)
📄 pythoninfo.py(20.34 KB)
📄 randv2_32.pck(7.34 KB)
📄 randv2_64.pck(7.19 KB)
📄 randv3.pck(7.82 KB)
📄 re_tests.py(25.93 KB)
📄 recursion.tar(516 B)
📄 regrtest.py(1.34 KB)
📄 relimport.py(27 B)
📄 reperf.py(538 B)
📄 revocation.crl(800 B)
📄 sample_doctest.py(1.02 KB)
📄 sample_doctest_no_docstrings.py(227 B)
📄 sample_doctest_no_doctests.py(269 B)
📄 secp384r1.pem(256 B)
📄 selfsigned_pythontestdotnet.pem(2.08 KB)
📄 seq_tests.py(14.18 KB)
📄 sgml_input.html(8.1 KB)
📄 signalinterproctester.py(2.7 KB)
📁 sndhdrdata
📄 sortperf.py(4.69 KB)
📄 ssl_cert.pem(1.53 KB)
📄 ssl_key.passwd.pem(2.59 KB)
📄 ssl_key.pem(2.43 KB)
📄 ssl_servers.py(7.04 KB)
📄 ssltests.py(1.03 KB)
📄 string_tests.py(64.65 KB)
📁 subprocessdata
📁 support
📄 talos-2019-0758.pem(1.3 KB)
📄 test___all__.py(4.12 KB)
📄 test___future__.py(2.36 KB)
📄 test__locale.py(7.83 KB)
📄 test__opcode.py(3.03 KB)
📄 test__osx_support.py(13.66 KB)
📄 test__xxsubinterpreters.py(68.7 KB)
📄 test_abc.py(18 KB)
📄 test_abstract_numbers.py(1.49 KB)
📄 test_aifc.py(17.68 KB)
📄 test_argparse.py(172.67 KB)
📄 test_array.py(52.57 KB)
📄 test_asdl_parser.py(4.15 KB)
📄 test_ast.py(88.53 KB)
📄 test_asyncgen.py(31.44 KB)
📄 test_asynchat.py(9.28 KB)
📁 test_asyncio
📄 test_asyncore.py(25.81 KB)
📄 test_atexit.py(5.81 KB)
📄 test_audioop.py(28.24 KB)
📄 test_audit.py(4.05 KB)
📄 test_augassign.py(7.68 KB)
📄 test_base64.py(30.17 KB)
📄 test_baseexception.py(6.86 KB)
📄 test_bdb.py(41.55 KB)
📄 test_bigaddrspace.py(2.92 KB)
📄 test_bigmem.py(44.88 KB)
📄 test_binascii.py(18 KB)
📄 test_binhex.py(1.79 KB)
📄 test_binop.py(14.14 KB)
📄 test_bisect.py(13.63 KB)
📄 test_bool.py(12.48 KB)
📄 test_buffer.py(160.04 KB)
📄 test_bufio.py(2.54 KB)
📄 test_builtin.py(78.38 KB)
📄 test_bytes.py(72.23 KB)
📄 test_bz2.py(36.76 KB)
📄 test_c_locale_coercion.py(18.82 KB)
📄 test_calendar.py(48.71 KB)
📄 test_call.py(20.88 KB)
📄 test_capi.py(30.46 KB)
📄 test_cgi.py(22.15 KB)
📄 test_cgitb.py(2.5 KB)
📄 test_charmapcodec.py(1.68 KB)
📄 test_class.py(17.42 KB)
📄 test_clinic.py(21.71 KB)
📄 test_cmath.py(24.07 KB)
📄 test_cmd.py(6.1 KB)
📄 test_cmd_line.py(33.72 KB)
📄 test_cmd_line_script.py(31.46 KB)
📄 test_code.py(13.66 KB)
📄 test_code_module.py(5.51 KB)
📄 test_codeccallbacks.py(40.97 KB)
📄 test_codecencodings_cn.py(3.86 KB)
📄 test_codecencodings_hk.py(701 B)
📄 test_codecencodings_iso2022.py(1.36 KB)
📄 test_codecencodings_jp.py(4.79 KB)
📄 test_codecencodings_kr.py(2.96 KB)
📄 test_codecencodings_tw.py(681 B)
📄 test_codecmaps_cn.py(746 B)
📄 test_codecmaps_hk.py(386 B)
📄 test_codecmaps_jp.py(1.7 KB)
📄 test_codecmaps_kr.py(1.16 KB)
📄 test_codecmaps_tw.py(705 B)
📄 test_codecs.py(129.38 KB)
📄 test_codeop.py(7.97 KB)
📄 test_collections.py(83.93 KB)
📄 test_colorsys.py(3.83 KB)
📄 test_compare.py(3.82 KB)
📄 test_compile.py(36.48 KB)
📄 test_compileall.py(26.7 KB)
📄 test_complex.py(30.24 KB)
📄 test_concurrent_futures.py(44.93 KB)
📄 test_configparser.py(84.93 KB)
📄 test_contains.py(3.49 KB)
📄 test_context.py(29.33 KB)
📄 test_contextlib.py(32.54 KB)
📄 test_contextlib_async.py(14.82 KB)
📄 test_copy.py(25.81 KB)
📄 test_copyreg.py(4.39 KB)
📄 test_coroutines.py(62.52 KB)
📄 test_cprofile.py(6.33 KB)
📄 test_crashers.py(1.17 KB)
📄 test_crypt.py(3.97 KB)
📄 test_csv.py(47.77 KB)
📄 test_ctypes.py(184 B)
📄 test_curses.py(45.47 KB)
📄 test_dataclasses.py(108.8 KB)
📄 test_datetime.py(2.15 KB)
📄 test_dbm.py(6.45 KB)
📄 test_dbm_dumb.py(10.61 KB)
📄 test_dbm_gnu.py(6.22 KB)
📄 test_dbm_ndbm.py(5.05 KB)
📄 test_decimal.py(206.63 KB)
📄 test_decorators.py(9.48 KB)
📄 test_defaultdict.py(5.88 KB)
📄 test_deque.py(34.46 KB)
📄 test_descr.py(190.58 KB)
📄 test_descrtut.py(11.53 KB)
📄 test_devpoll.py(4.5 KB)
📄 test_dict.py(45 KB)
📄 test_dict_version.py(5.88 KB)
📄 test_dictcomps.py(4.42 KB)
📄 test_dictviews.py(11.68 KB)
📄 test_difflib.py(19.64 KB)
📄 test_difflib_expect.html(100.85 KB)
📄 test_dis.py(48.4 KB)
📄 test_distutils.py(375 B)
📄 test_doctest.py(98.67 KB)
📄 test_doctest.txt(300 B)
📄 test_doctest2.py(2.3 KB)
📄 test_doctest2.txt(392 B)
📄 test_doctest3.txt(82 B)
📄 test_doctest4.txt(244 B)
📄 test_docxmlrpc.py(8.67 KB)
📄 test_dtrace.py(5.23 KB)
📄 test_dummy_thread.py(9.69 KB)
📄 test_dummy_threading.py(1.7 KB)
📄 test_dynamic.py(4.29 KB)
📄 test_dynamicclassattribute.py(9.57 KB)
📄 test_eintr.py(1.32 KB)
📁 test_email
📄 test_embed.py(49.23 KB)
📄 test_ensurepip.py(9.83 KB)
📄 test_enum.py(113.68 KB)
📄 test_enumerate.py(8.46 KB)
📄 test_eof.py(1.94 KB)
📄 test_epoll.py(9.03 KB)
📄 test_errno.py(1.04 KB)
📄 test_exception_hierarchy.py(7.43 KB)
📄 test_exception_variations.py(3.86 KB)
📄 test_exceptions.py(49.81 KB)
📄 test_extcall.py(13.49 KB)
📄 test_faulthandler.py(28.13 KB)
📄 test_fcntl.py(6.21 KB)
📄 test_file.py(11.02 KB)
📄 test_file_eintr.py(10.6 KB)
📄 test_filecmp.py(8.69 KB)
📄 test_fileinput.py(37.33 KB)
📄 test_fileio.py(19.96 KB)
📄 test_finalization.py(14.66 KB)
📄 test_float.py(63.41 KB)
📄 test_flufl.py(1.32 KB)
📄 test_fnmatch.py(5.07 KB)
📄 test_fork1.py(3.67 KB)
📄 test_format.py(22.58 KB)
📄 test_fractions.py(29.83 KB)
📄 test_frame.py(5.67 KB)
📄 test_frozen.py(943 B)
📄 test_fstring.py(46.16 KB)
📄 test_ftplib.py(39.71 KB)
📄 test_funcattrs.py(13.54 KB)
📄 test_functools.py(90.59 KB)
📄 test_future.py(11.9 KB)
📄 test_future3.py(490 B)
📄 test_future4.py(222 B)
📄 test_future5.py(510 B)
📄 test_gc.py(40.49 KB)
📄 test_gdb.py(40.88 KB)
📄 test_generator_stop.py(943 B)
📄 test_generators.py(58.51 KB)
📄 test_genericclass.py(9.28 KB)
📄 test_genericpath.py(21.7 KB)
📄 test_genexps.py(7.12 KB)
📄 test_getargs2.py(50 KB)
📄 test_getopt.py(6.75 KB)
📄 test_getpass.py(6.29 KB)
📄 test_gettext.py(41.38 KB)
📄 test_glob.py(13.03 KB)
📄 test_global.py(1.31 KB)
📄 test_grammar.py(57.5 KB)
📄 test_grp.py(3.54 KB)
📄 test_gzip.py(29.9 KB)
📄 test_hash.py(11.45 KB)
📄 test_hashlib.py(39.43 KB)
📄 test_heapq.py(16.4 KB)
📄 test_hmac.py(22.24 KB)
📄 test_html.py(4.23 KB)
📄 test_htmlparser.py(33.19 KB)
📄 test_http_cookiejar.py(78.36 KB)
📄 test_http_cookies.py(18.71 KB)
📄 test_httplib.py(76.98 KB)
📄 test_httpservers.py(45.24 KB)
📄 test_idle.py(825 B)
📄 test_imaplib.py(38.95 KB)
📄 test_imghdr.py(4.66 KB)
📄 test_imp.py(17.73 KB)
📁 test_import
📁 test_importlib
📄 test_index.py(8.37 KB)
📄 test_inspect.py(151.79 KB)
📄 test_int.py(20.8 KB)
📄 test_int_literal.py(6.89 KB)
📄 test_io.py(163.94 KB)
📄 test_ioctl.py(3.2 KB)
📄 test_ipaddress.py(90.98 KB)
📄 test_isinstance.py(10.25 KB)
📄 test_iter.py(31.81 KB)
📄 test_iterlen.py(7.1 KB)
📄 test_itertools.py(101.41 KB)
📁 test_json
📄 test_keyword.py(1.23 KB)
📄 test_keywordonlyarg.py(6.85 KB)
📄 test_kqueue.py(8.76 KB)
📄 test_largefile.py(6.83 KB)
📄 test_lib2to3.py(101 B)
📄 test_linecache.py(7.79 KB)
📄 test_list.py(7.4 KB)
📄 test_listcomps.py(3.76 KB)
📄 test_lltrace.py(1012 B)
📄 test_locale.py(23.87 KB)
📄 test_logging.py(182.43 KB)
📄 test_long.py(53.21 KB)
📄 test_longexp.py(233 B)
📄 test_lzma.py(87.92 KB)
📄 test_mailbox.py(91.92 KB)
📄 test_mailcap.py(9.88 KB)
📄 test_marshal.py(20.57 KB)
📄 test_math.py(82.18 KB)
📄 test_memoryio.py(31.48 KB)
📄 test_memoryview.py(17.78 KB)
📄 test_metaclass.py(6.2 KB)
📄 test_mimetypes.py(12.14 KB)
📄 test_minidom.py(66.95 KB)
📄 test_mmap.py(29.04 KB)
📄 test_module.py(10.3 KB)
📄 test_modulefinder.py(12.2 KB)
📄 test_msilib.py(5.06 KB)
📄 test_multibytecodec.py(15.04 KB)
📄 test_multiprocessing_fork.py(477 B)
📄 test_multiprocessing_forkserver.py(392 B)
📄 test_multiprocessing_main_handling.py(11.45 KB)
📄 test_multiprocessing_spawn.py(277 B)
📄 test_named_expressions.py(16.51 KB)
📄 test_netrc.py(5.96 KB)
📄 test_nis.py(1.13 KB)
📄 test_nntplib.py(61.7 KB)
📄 test_normalization.py(3.66 KB)
📄 test_ntpath.py(35.08 KB)
📄 test_numeric_tower.py(7.18 KB)
📄 test_opcodes.py(3.61 KB)
📄 test_openpty.py(600 B)
📄 test_operator.py(23.54 KB)
📄 test_optparse.py(60.99 KB)
📄 test_ordered_dict.py(30.22 KB)
📄 test_os.py(150.53 KB)
📄 test_ossaudiodev.py(7.06 KB)
📄 test_osx_env.py(1.3 KB)
📄 test_parser.py(35.72 KB)
📄 test_pathlib.py(97.12 KB)
📄 test_pdb.py(55.36 KB)
📄 test_peepholer.py(19.41 KB)
📄 test_pickle.py(19.16 KB)
📄 test_picklebuffer.py(4.96 KB)
📄 test_pickletools.py(4.33 KB)
📄 test_pipes.py(6.59 KB)
📄 test_pkg.py(9.59 KB)
📄 test_pkgimport.py(2.67 KB)
📄 test_pkgutil.py(19.25 KB)
📄 test_platform.py(14.31 KB)
📄 test_plistlib.py(41.43 KB)
📄 test_poll.py(7.23 KB)
📄 test_popen.py(1.98 KB)
📄 test_poplib.py(16.97 KB)
📄 test_positional_only_arg.py(17.5 KB)
📄 test_posix.py(75.76 KB)
📄 test_posixpath.py(29.19 KB)
📄 test_pow.py(5.44 KB)
📄 test_pprint.py(43.85 KB)
📄 test_print.py(7.37 KB)
📄 test_profile.py(8.72 KB)
📄 test_property.py(8.77 KB)
📄 test_pstats.py(3.04 KB)
📄 test_pty.py(11.97 KB)
📄 test_pulldom.py(12.66 KB)
📄 test_pwd.py(4.17 KB)
📄 test_py_compile.py(10.78 KB)
📄 test_pyclbr.py(10 KB)
📄 test_pydoc.py(56.98 KB)
📄 test_pyexpat.py(26.54 KB)
📄 test_queue.py(20.36 KB)
📄 test_quopri.py(7.78 KB)
📄 test_raise.py(12.86 KB)
📄 test_random.py(45.59 KB)
📄 test_range.py(23.35 KB)
📄 test_re.py(106.41 KB)
📄 test_readline.py(12.95 KB)
📄 test_regrtest.py(46.36 KB)
📄 test_repl.py(3.96 KB)
📄 test_reprlib.py(15.12 KB)
📄 test_resource.py(7.02 KB)
📄 test_richcmp.py(11.91 KB)
📄 test_rlcompleter.py(6.3 KB)
📄 test_robotparser.py(10.69 KB)
📄 test_runpy.py(33.86 KB)
📄 test_sax.py(46.9 KB)
📄 test_sched.py(6.41 KB)
📄 test_scope.py(19.7 KB)
📄 test_script_helper.py(5.78 KB)
📄 test_secrets.py(4.28 KB)
📄 test_select.py(2.69 KB)
📄 test_selectors.py(17.79 KB)
📄 test_set.py(64.41 KB)
📄 test_setcomps.py(3.7 KB)
📄 test_shelve.py(6.24 KB)
📄 test_shlex.py(13.29 KB)
📄 test_shutil.py(101.55 KB)
📄 test_signal.py(46.62 KB)
📄 test_site.py(24.71 KB)
📄 test_slice.py(8.25 KB)
📄 test_smtpd.py(40.14 KB)
📄 test_smtplib.py(56.51 KB)
📄 test_smtpnet.py(2.87 KB)
📄 test_sndhdr.py(1.43 KB)
📄 test_socket.py(232.71 KB)
📄 test_socketserver.py(17.7 KB)
📄 test_sort.py(13.42 KB)
📄 test_source_encoding.py(7.89 KB)
📄 test_spwd.py(2.71 KB)
📄 test_sqlite.py(948 B)
📄 test_ssl.py(203.3 KB)
📄 test_startfile.py(1.29 KB)
📄 test_stat.py(8.3 KB)
📄 test_statistics.py(106.5 KB)
📄 test_strftime.py(7.54 KB)
📄 test_string.py(19.8 KB)
📄 test_string_literals.py(9.88 KB)
📄 test_stringprep.py(3.04 KB)
📄 test_strptime.py(34.42 KB)
📄 test_strtod.py(20.06 KB)
📄 test_struct.py(34.41 KB)
📄 test_structmembers.py(4.7 KB)
📄 test_structseq.py(3.87 KB)
📄 test_subclassinit.py(8.12 KB)
📄 test_subprocess.py(142.64 KB)
📄 test_sunau.py(6.07 KB)
📄 test_sundry.py(2.07 KB)
📄 test_super.py(9.6 KB)
📄 test_support.py(24.12 KB)
📄 test_symbol.py(2.06 KB)
📄 test_symtable.py(9.13 KB)
📄 test_syntax.py(25.75 KB)
📄 test_sys.py(55.24 KB)
📄 test_sys_setprofile.py(12.31 KB)
📄 test_sys_settrace.py(43.08 KB)
📄 test_sysconfig.py(17.01 KB)
📄 test_syslog.py(1.15 KB)
📄 test_tabnanny.py(13.44 KB)
📄 test_tarfile.py(98.31 KB)
📄 test_tcl.py(30.74 KB)
📄 test_telnetlib.py(12.7 KB)
📄 test_tempfile.py(52.57 KB)
📄 test_textwrap.py(38.84 KB)
📄 test_thread.py(8.41 KB)
📄 test_threaded_import.py(8.9 KB)
📄 test_threadedtempfile.py(1.85 KB)
📄 test_threading.py(47.52 KB)
📄 test_threading_local.py(6.09 KB)
📄 test_threadsignals.py(10.09 KB)
📄 test_time.py(38.43 KB)
📄 test_timeit.py(14.8 KB)
📄 test_timeout.py(11.19 KB)
📄 test_tix.py(756 B)
📄 test_tk.py(362 B)
📄 test_tokenize.py(63.18 KB)
📁 test_tools
📄 test_trace.py(19.89 KB)
📄 test_traceback.py(46.97 KB)
📄 test_tracemalloc.py(37.41 KB)
📄 test_ttk_guionly.py(746 B)
📄 test_ttk_textonly.py(299 B)
📄 test_tuple.py(18.85 KB)
📄 test_turtle.py(12.79 KB)
📄 test_type_comments.py(10.13 KB)
📄 test_typechecks.py(2.55 KB)
📄 test_types.py(58 KB)
📄 test_typing.py(122.05 KB)
📄 test_ucn.py(9.35 KB)
📄 test_unary.py(1.63 KB)
📄 test_unicode.py(129.94 KB)
📄 test_unicode_file.py(5.74 KB)
📄 test_unicode_file_functions.py(6.84 KB)
📄 test_unicode_identifiers.py(891 B)
📄 test_unicodedata.py(12.7 KB)
📄 test_unittest.py(286 B)
📄 test_univnewlines.py(3.83 KB)
📄 test_unpack.py(3.01 KB)
📄 test_unpack_ex.py(8.73 KB)
📄 test_urllib.py(71.24 KB)
📄 test_urllib2.py(76.95 KB)
📄 test_urllib2_localnet.py(24.24 KB)
📄 test_urllib2net.py(12.39 KB)
📄 test_urllib_response.py(1.69 KB)
📄 test_urllibnet.py(8.9 KB)
📄 test_urlparse.py(64.87 KB)
📄 test_userdict.py(7.64 KB)
📄 test_userlist.py(1.97 KB)
📄 test_userstring.py(2.4 KB)
📄 test_utf8_mode.py(9.22 KB)
📄 test_utf8source.py(1.15 KB)
📄 test_uu.py(8.02 KB)
📄 test_uuid.py(35.74 KB)
📄 test_venv.py(20.46 KB)
📄 test_wait3.py(1.16 KB)
📄 test_wait4.py(1.15 KB)
📁 test_warnings
📄 test_wave.py(6.57 KB)
📄 test_weakref.py(69.47 KB)
📄 test_weakset.py(15.03 KB)
📄 test_webbrowser.py(10.47 KB)
📄 test_winconsoleio.py(6.14 KB)
📄 test_winreg.py(21.38 KB)
📄 test_winsound.py(4.57 KB)
📄 test_with.py(25.78 KB)
📄 test_wsgiref.py(30.1 KB)
📄 test_xdrlib.py(2.17 KB)
📄 test_xml_dom_minicompat.py(4.18 KB)
📄 test_xml_etree.py(147.87 KB)
📄 test_xml_etree_c.py(8.06 KB)
📄 test_xmlrpc.py(55.96 KB)
📄 test_xmlrpc_net.py(1015 B)
📄 test_xxtestfuzz.py(670 B)
📄 test_yield_from.py(30.01 KB)
📄 test_zipapp.py(15.92 KB)
📄 test_zipfile.py(115.45 KB)
📄 test_zipfile64.py(5.8 KB)
📄 test_zipimport.py(29.28 KB)
📄 test_zipimport_support.py(10.44 KB)
📄 test_zlib.py(34.48 KB)
📄 testcodec.py(1.02 KB)
📄 testtar.tar(425 KB)
📄 tf_inherit_check.py(714 B)
📄 threaded_import_hangers.py(1.45 KB)
📄 time_hashlib.py(2.87 KB)
📄 tokenize_tests-latin1-coding-cookie-and-utf8-bom-sig.txt(443 B)
📄 tokenize_tests-no-coding-cookie-and-utf8-bom-sig-only.txt(302 B)
📄 tokenize_tests-utf8-coding-cookie-and-no-utf8-bom-sig.txt(421 B)
📄 tokenize_tests-utf8-coding-cookie-and-utf8-bom-sig.txt(326 B)
📄 tokenize_tests.txt(2.65 KB)
📁 tracedmodules
📄 win_console_handler.py(1.38 KB)
📁 xmltestdata
📄 xmltests.py(499 B)
📄 zip_cp437_header.zip(270 B)
📄 zipdir.zip(374 B)
📁 ziptestdata

Editing: test_weakref.py

import gc
import sys
import unittest
import collections
import weakref
import operator
import contextlib
import copy
import threading
import time
import random

from test import support
from test.support import script_helper

# Used in ReferencesTestCase.test_ref_created_during_del() .
ref_from_del = None

# Used by FinalizeTestCase as a global that may be replaced by None
# when the interpreter shuts down.
_global_var = 'foobar'

class C:
    def method(self):
        pass

class Callable:
    bar = None

def __call__(self, x):
        self.bar = x

def create_function():
    def f(): pass
    return f

def create_bound_method():
    return C().method

class Object:
    def __init__(self, arg):
        self.arg = arg
    def __repr__(self):
        return "<Object %r>" % self.arg
    def __eq__(self, other):
        if isinstance(other, Object):
            return self.arg == other.arg
        return NotImplemented
    def __lt__(self, other):
        if isinstance(other, Object):
            return self.arg < other.arg
        return NotImplemented
    def __hash__(self):
        return hash(self.arg)
    def some_method(self):
        return 4
    def other_method(self):
        return 5

class RefCycle:
    def __init__(self):
        self.cycle = self

class TestBase(unittest.TestCase):

def setUp(self):
        self.cbcalled = 0

def callback(self, ref):
        self.cbcalled += 1

@contextlib.contextmanager
def collect_in_thread(period=0.0001):
    """
    Ensure GC collections happen in a different thread, at a high frequency.
    """
    please_stop = False

def collect():
        while not please_stop:
            time.sleep(period)
            gc.collect()

with support.disable_gc():
        t = threading.Thread(target=collect)
        t.start()
        try:
            yield
        finally:
            please_stop = True
            t.join()

class ReferencesTestCase(TestBase):

def test_basic_ref(self):
        self.check_basic_ref(C)
        self.check_basic_ref(create_function)
        self.check_basic_ref(create_bound_method)

# Just make sure the tp_repr handler doesn't raise an exception.
        # Live reference:
        o = C()
        wr = weakref.ref(o)
        repr(wr)
        # Dead reference:
        del o
        repr(wr)

def test_basic_callback(self):
        self.check_basic_callback(C)
        self.check_basic_callback(create_function)
        self.check_basic_callback(create_bound_method)

@support.cpython_only
    def test_cfunction(self):
        import _testcapi
        create_cfunction = _testcapi.create_cfunction
        f = create_cfunction()
        wr = weakref.ref(f)
        self.assertIs(wr(), f)
        del f
        self.assertIsNone(wr())
        self.check_basic_ref(create_cfunction)
        self.check_basic_callback(create_cfunction)

def test_multiple_callbacks(self):
        o = C()
        ref1 = weakref.ref(o, self.callback)
        ref2 = weakref.ref(o, self.callback)
        del o
        self.assertIsNone(ref1(), "expected reference to be invalidated")
        self.assertIsNone(ref2(), "expected reference to be invalidated")
        self.assertEqual(self.cbcalled, 2,
                     "callback not called the right number of times")

def test_multiple_selfref_callbacks(self):
        # Make sure all references are invalidated before callbacks are called
        #
        # What's important here is that we're using the first
        # reference in the callback invoked on the second reference
        # (the most recently created ref is cleaned up first).  This
        # tests that all references to the object are invalidated
        # before any of the callbacks are invoked, so that we only
        # have one invocation of _weakref.c:cleanup_helper() active
        # for a particular object at a time.
        #
        def callback(object, self=self):
            self.ref()
        c = C()
        self.ref = weakref.ref(c, callback)
        ref1 = weakref.ref(c, callback)
        del c

def test_constructor_kwargs(self):
        c = C()
        self.assertRaises(TypeError, weakref.ref, c, callback=None)

def test_proxy_ref(self):
        o = C()
        o.bar = 1
        ref1 = weakref.proxy(o, self.callback)
        ref2 = weakref.proxy(o, self.callback)
        del o

def check(proxy):
            proxy.bar

self.assertRaises(ReferenceError, check, ref1)
        self.assertRaises(ReferenceError, check, ref2)
        self.assertRaises(ReferenceError, bool, weakref.proxy(C()))
        self.assertEqual(self.cbcalled, 2)

def check_basic_ref(self, factory):
        o = factory()
        ref = weakref.ref(o)
        self.assertIsNotNone(ref(),
                     "weak reference to live object should be live")
        o2 = ref()
        self.assertIs(o, o2,
                     "<ref>() should return original object if live")

def check_basic_callback(self, factory):
        self.cbcalled = 0
        o = factory()
        ref = weakref.ref(o, self.callback)
        del o
        self.assertEqual(self.cbcalled, 1,
                     "callback did not properly set 'cbcalled'")
        self.assertIsNone(ref(),
                     "ref2 should be dead after deleting object reference")

def test_ref_reuse(self):
        o = C()
        ref1 = weakref.ref(o)
        # create a proxy to make sure that there's an intervening creation
        # between these two; it should make no difference
        proxy = weakref.proxy(o)
        ref2 = weakref.ref(o)
        self.assertIs(ref1, ref2,
                     "reference object w/out callback should be re-used")

o = C()
        proxy = weakref.proxy(o)
        ref1 = weakref.ref(o)
        ref2 = weakref.ref(o)
        self.assertIs(ref1, ref2,
                     "reference object w/out callback should be re-used")
        self.assertEqual(weakref.getweakrefcount(o), 2,
                     "wrong weak ref count for object")
        del proxy
        self.assertEqual(weakref.getweakrefcount(o), 1,
                     "wrong weak ref count for object after deleting proxy")

def test_proxy_reuse(self):
        o = C()
        proxy1 = weakref.proxy(o)
        ref = weakref.ref(o)
        proxy2 = weakref.proxy(o)
        self.assertIs(proxy1, proxy2,
                     "proxy object w/out callback should have been re-used")

def test_basic_proxy(self):
        o = C()
        self.check_proxy(o, weakref.proxy(o))

L = collections.UserList()
        p = weakref.proxy(L)
        self.assertFalse(p, "proxy for empty UserList should be false")
        p.append(12)
        self.assertEqual(len(L), 1)
        self.assertTrue(p, "proxy for non-empty UserList should be true")
        p[:] = [2, 3]
        self.assertEqual(len(L), 2)
        self.assertEqual(len(p), 2)
        self.assertIn(3, p, "proxy didn't support __contains__() properly")
        p[1] = 5
        self.assertEqual(L[1], 5)
        self.assertEqual(p[1], 5)
        L2 = collections.UserList(L)
        p2 = weakref.proxy(L2)
        self.assertEqual(p, p2)
        ## self.assertEqual(repr(L2), repr(p2))
        L3 = collections.UserList(range(10))
        p3 = weakref.proxy(L3)
        self.assertEqual(L3[:], p3[:])
        self.assertEqual(L3[5:], p3[5:])
        self.assertEqual(L3[:5], p3[:5])
        self.assertEqual(L3[2:5], p3[2:5])

def test_proxy_unicode(self):
        # See bug 5037
        class C(object):
            def __str__(self):
                return "string"
            def __bytes__(self):
                return b"bytes"
        instance = C()
        self.assertIn("__bytes__", dir(weakref.proxy(instance)))
        self.assertEqual(bytes(weakref.proxy(instance)), b"bytes")

def test_proxy_index(self):
        class C:
            def __index__(self):
                return 10
        o = C()
        p = weakref.proxy(o)
        self.assertEqual(operator.index(p), 10)

def test_proxy_div(self):
        class C:
            def __floordiv__(self, other):
                return 42
            def __ifloordiv__(self, other):
                return 21
        o = C()
        p = weakref.proxy(o)
        self.assertEqual(p // 5, 42)
        p //= 5
        self.assertEqual(p, 21)

def test_proxy_matmul(self):
        class C:
            def __matmul__(self, other):
                return 1729
            def __rmatmul__(self, other):
                return -163
            def __imatmul__(self, other):
                return 561
        o = C()
        p = weakref.proxy(o)
        self.assertEqual(p @ 5, 1729)
        self.assertEqual(5 @ p, -163)
        p @= 5
        self.assertEqual(p, 561)

# The PyWeakref_* C API is documented as allowing either NULL or
    # None as the value for the callback, where either means "no
    # callback".  The "no callback" ref and proxy objects are supposed
    # to be shared so long as they exist by all callers so long as
    # they are active.  In Python 2.3.3 and earlier, this guarantee
    # was not honored, and was broken in different ways for
    # PyWeakref_NewRef() and PyWeakref_NewProxy().  (Two tests.)

def test_shared_ref_without_callback(self):
        self.check_shared_without_callback(weakref.ref)

def test_shared_proxy_without_callback(self):
        self.check_shared_without_callback(weakref.proxy)

def check_shared_without_callback(self, makeref):
        o = Object(1)
        p1 = makeref(o, None)
        p2 = makeref(o, None)
        self.assertIs(p1, p2, "both callbacks were None in the C API")
        del p1, p2
        p1 = makeref(o)
        p2 = makeref(o, None)
        self.assertIs(p1, p2, "callbacks were NULL, None in the C API")
        del p1, p2
        p1 = makeref(o)
        p2 = makeref(o)
        self.assertIs(p1, p2, "both callbacks were NULL in the C API")
        del p1, p2
        p1 = makeref(o, None)
        p2 = makeref(o)
        self.assertIs(p1, p2, "callbacks were None, NULL in the C API")

def test_callable_proxy(self):
        o = Callable()
        ref1 = weakref.proxy(o)

self.check_proxy(o, ref1)

self.assertIs(type(ref1), weakref.CallableProxyType,
                     "proxy is not of callable type")
        ref1('twinkies!')
        self.assertEqual(o.bar, 'twinkies!',
                     "call through proxy not passed through to original")
        ref1(x='Splat.')
        self.assertEqual(o.bar, 'Splat.',
                     "call through proxy not passed through to original")

# expect due to too few args
        self.assertRaises(TypeError, ref1)

# expect due to too many args
        self.assertRaises(TypeError, ref1, 1, 2, 3)

def check_proxy(self, o, proxy):
        o.foo = 1
        self.assertEqual(proxy.foo, 1,
                     "proxy does not reflect attribute addition")
        o.foo = 2
        self.assertEqual(proxy.foo, 2,
                     "proxy does not reflect attribute modification")
        del o.foo
        self.assertFalse(hasattr(proxy, 'foo'),
                     "proxy does not reflect attribute removal")

proxy.foo = 1
        self.assertEqual(o.foo, 1,
                     "object does not reflect attribute addition via proxy")
        proxy.foo = 2
        self.assertEqual(o.foo, 2,
            "object does not reflect attribute modification via proxy")
        del proxy.foo
        self.assertFalse(hasattr(o, 'foo'),
                     "object does not reflect attribute removal via proxy")

def test_proxy_deletion(self):
        # Test clearing of SF bug #762891
        class Foo:
            result = None
            def __delitem__(self, accessor):
                self.result = accessor
        g = Foo()
        f = weakref.proxy(g)
        del f[0]
        self.assertEqual(f.result, 0)

def test_proxy_bool(self):
        # Test clearing of SF bug #1170766
        class List(list): pass
        lyst = List()
        self.assertEqual(bool(weakref.proxy(lyst)), bool(lyst))

def test_proxy_iter(self):
        # Test fails with a debug build of the interpreter
        # (see bpo-38395).

obj = None

class MyObj:
            def __iter__(self):
                nonlocal obj
                del obj
                return NotImplemented

obj = MyObj()
        p = weakref.proxy(obj)
        with self.assertRaises(TypeError):
            # "blech" in p calls MyObj.__iter__ through the proxy,
            # without keeping a reference to the real object, so it
            # can be killed in the middle of the call
            "blech" in p

def test_getweakrefcount(self):
        o = C()
        ref1 = weakref.ref(o)
        ref2 = weakref.ref(o, self.callback)
        self.assertEqual(weakref.getweakrefcount(o), 2,
                     "got wrong number of weak reference objects")

proxy1 = weakref.proxy(o)
        proxy2 = weakref.proxy(o, self.callback)
        self.assertEqual(weakref.getweakrefcount(o), 4,
                     "got wrong number of weak reference objects")

del ref1, ref2, proxy1, proxy2
        self.assertEqual(weakref.getweakrefcount(o), 0,
                     "weak reference objects not unlinked from"
                     " referent when discarded.")

# assumes ints do not support weakrefs
        self.assertEqual(weakref.getweakrefcount(1), 0,
                     "got wrong number of weak reference objects for int")

def test_getweakrefs(self):
        o = C()
        ref1 = weakref.ref(o, self.callback)
        ref2 = weakref.ref(o, self.callback)
        del ref1
        self.assertEqual(weakref.getweakrefs(o), [ref2],
                     "list of refs does not match")

o = C()
        ref1 = weakref.ref(o, self.callback)
        ref2 = weakref.ref(o, self.callback)
        del ref2
        self.assertEqual(weakref.getweakrefs(o), [ref1],
                     "list of refs does not match")

del ref1
        self.assertEqual(weakref.getweakrefs(o), [],
                     "list of refs not cleared")

# assumes ints do not support weakrefs
        self.assertEqual(weakref.getweakrefs(1), [],
                     "list of refs does not match for int")

def test_newstyle_number_ops(self):
        class F(float):
            pass
        f = F(2.0)
        p = weakref.proxy(f)
        self.assertEqual(p + 1.0, 3.0)
        self.assertEqual(1.0 + p, 3.0)  # this used to SEGV

def test_callbacks_protected(self):
        # Callbacks protected from already-set exceptions?
        # Regression test for SF bug #478534.
        class BogusError(Exception):
            pass
        data = {}
        def remove(k):
            del data[k]
        def encapsulate():
            f = lambda : ()
            data[weakref.ref(f, remove)] = None
            raise BogusError
        try:
            encapsulate()
        except BogusError:
            pass
        else:
            self.fail("exception not properly restored")
        try:
            encapsulate()
        except BogusError:
            pass
        else:
            self.fail("exception not properly restored")

def test_sf_bug_840829(self):
        # "weakref callbacks and gc corrupt memory"
        # subtype_dealloc erroneously exposed a new-style instance
        # already in the process of getting deallocated to gc,
        # causing double-deallocation if the instance had a weakref
        # callback that triggered gc.
        # If the bug exists, there probably won't be an obvious symptom
        # in a release build.  In a debug build, a segfault will occur
        # when the second attempt to remove the instance from the "list
        # of all objects" occurs.

import gc

class C(object):
            pass

c = C()
        wr = weakref.ref(c, lambda ignore: gc.collect())
        del c

# There endeth the first part.  It gets worse.
        del wr

c1 = C()
        c1.i = C()
        wr = weakref.ref(c1.i, lambda ignore: gc.collect())

c2 = C()
        c2.c1 = c1
        del c1  # still alive because c2 points to it

# Now when subtype_dealloc gets called on c2, it's not enough just
        # that c2 is immune from gc while the weakref callbacks associated
        # with c2 execute (there are none in this 2nd half of the test, btw).
        # subtype_dealloc goes on to call the base classes' deallocs too,
        # so any gc triggered by weakref callbacks associated with anything
        # torn down by a base class dealloc can also trigger double
        # deallocation of c2.
        del c2

def test_callback_in_cycle_1(self):
        import gc

class J(object):
            pass

class II(object):
            def acallback(self, ignore):
                self.J

I = II()
        I.J = J
        I.wr = weakref.ref(J, I.acallback)

# Now J and II are each in a self-cycle (as all new-style class
        # objects are, since their __mro__ points back to them).  I holds
        # both a weak reference (I.wr) and a strong reference (I.J) to class
        # J.  I is also in a cycle (I.wr points to a weakref that references
        # I.acallback).  When we del these three, they all become trash, but
        # the cycles prevent any of them from getting cleaned up immediately.
        # Instead they have to wait for cyclic gc to deduce that they're
        # trash.
        #
        # gc used to call tp_clear on all of them, and the order in which
        # it does that is pretty accidental.  The exact order in which we
        # built up these things manages to provoke gc into running tp_clear
        # in just the right order (I last).  Calling tp_clear on II leaves
        # behind an insane class object (its __mro__ becomes NULL).  Calling
        # tp_clear on J breaks its self-cycle, but J doesn't get deleted
        # just then because of the strong reference from I.J.  Calling
        # tp_clear on I starts to clear I's __dict__, and just happens to
        # clear I.J first -- I.wr is still intact.  That removes the last
        # reference to J, which triggers the weakref callback.  The callback
        # tries to do "self.J", and instances of new-style classes look up
        # attributes ("J") in the class dict first.  The class (II) wants to
        # search II.__mro__, but that's NULL.   The result was a segfault in
        # a release build, and an assert failure in a debug build.
        del I, J, II
        gc.collect()

def test_callback_in_cycle_2(self):
        import gc

# This is just like test_callback_in_cycle_1, except that II is an
        # old-style class.  The symptom is different then:  an instance of an
        # old-style class looks in its own __dict__ first.  'J' happens to
        # get cleared from I.__dict__ before 'wr', and 'J' was never in II's
        # __dict__, so the attribute isn't found.  The difference is that
        # the old-style II doesn't have a NULL __mro__ (it doesn't have any
        # __mro__), so no segfault occurs.  Instead it got:
        #    test_callback_in_cycle_2 (__main__.ReferencesTestCase) ...
        #    Exception exceptions.AttributeError:
        #   "II instance has no attribute 'J'" in <bound method II.acallback
        #       of <?.II instance at 0x00B9B4B8>> ignored

class J(object):
            pass

class II:
            def acallback(self, ignore):
                self.J

I = II()
        I.J = J
        I.wr = weakref.ref(J, I.acallback)

del I, J, II
        gc.collect()

def test_callback_in_cycle_3(self):
        import gc

# This one broke the first patch that fixed the last two.  In this
        # case, the objects reachable from the callback aren't also reachable
        # from the object (c1) *triggering* the callback:  you can get to
        # c1 from c2, but not vice-versa.  The result was that c2's __dict__
        # got tp_clear'ed by the time the c2.cb callback got invoked.

class C:
            def cb(self, ignore):
                self.me
                self.c1
                self.wr

c1, c2 = C(), C()

c2.me = c2
        c2.c1 = c1
        c2.wr = weakref.ref(c1, c2.cb)

del c1, c2
        gc.collect()

def test_callback_in_cycle_4(self):
        import gc

# Like test_callback_in_cycle_3, except c2 and c1 have different
        # classes.  c2's class (C) isn't reachable from c1 then, so protecting
        # objects reachable from the dying object (c1) isn't enough to stop
        # c2's class (C) from getting tp_clear'ed before c2.cb is invoked.
        # The result was a segfault (C.__mro__ was NULL when the callback
        # tried to look up self.me).

class C(object):
            def cb(self, ignore):
                self.me
                self.c1
                self.wr

class D:
            pass

c1, c2 = D(), C()

c2.me = c2
        c2.c1 = c1
        c2.wr = weakref.ref(c1, c2.cb)

del c1, c2, C, D
        gc.collect()

@support.requires_type_collecting
    def test_callback_in_cycle_resurrection(self):
        import gc

# Do something nasty in a weakref callback:  resurrect objects
        # from dead cycles.  For this to be attempted, the weakref and
        # its callback must also be part of the cyclic trash (else the
        # objects reachable via the callback couldn't be in cyclic trash
        # to begin with -- the callback would act like an external root).
        # But gc clears trash weakrefs with callbacks early now, which
        # disables the callbacks, so the callbacks shouldn't get called
        # at all (and so nothing actually gets resurrected).

alist = []
        class C(object):
            def __init__(self, value):
                self.attribute = value

def acallback(self, ignore):
                alist.append(self.c)

c1, c2 = C(1), C(2)
        c1.c = c2
        c2.c = c1
        c1.wr = weakref.ref(c2, c1.acallback)
        c2.wr = weakref.ref(c1, c2.acallback)

def C_went_away(ignore):
            alist.append("C went away")
        wr = weakref.ref(C, C_went_away)

del c1, c2, C   # make them all trash
        self.assertEqual(alist, [])  # del isn't enough to reclaim anything

gc.collect()
        # c1.wr and c2.wr were part of the cyclic trash, so should have
        # been cleared without their callbacks executing.  OTOH, the weakref
        # to C is bound to a function local (wr), and wasn't trash, so that
        # callback should have been invoked when C went away.
        self.assertEqual(alist, ["C went away"])
        # The remaining weakref should be dead now (its callback ran).
        self.assertEqual(wr(), None)

del alist[:]
        gc.collect()
        self.assertEqual(alist, [])

def test_callbacks_on_callback(self):
        import gc

# Set up weakref callbacks *on* weakref callbacks.
        alist = []
        def safe_callback(ignore):
            alist.append("safe_callback called")

class C(object):
            def cb(self, ignore):
                alist.append("cb called")

c, d = C(), C()
        c.other = d
        d.other = c
        callback = c.cb
        c.wr = weakref.ref(d, callback)     # this won't trigger
        d.wr = weakref.ref(callback, d.cb)  # ditto
        external_wr = weakref.ref(callback, safe_callback)  # but this will
        self.assertIs(external_wr(), callback)

# The weakrefs attached to c and d should get cleared, so that
        # C.cb is never called.  But external_wr isn't part of the cyclic
        # trash, and no cyclic trash is reachable from it, so safe_callback
        # should get invoked when the bound method object callback (c.cb)
        # -- which is itself a callback, and also part of the cyclic trash --
        # gets reclaimed at the end of gc.

del callback, c, d, C
        self.assertEqual(alist, [])  # del isn't enough to clean up cycles
        gc.collect()
        self.assertEqual(alist, ["safe_callback called"])
        self.assertEqual(external_wr(), None)

del alist[:]
        gc.collect()
        self.assertEqual(alist, [])

def test_gc_during_ref_creation(self):
        self.check_gc_during_creation(weakref.ref)

def test_gc_during_proxy_creation(self):
        self.check_gc_during_creation(weakref.proxy)

def check_gc_during_creation(self, makeref):
        thresholds = gc.get_threshold()
        gc.set_threshold(1, 1, 1)
        gc.collect()
        class A:
            pass

def callback(*args):
            pass

referenced = A()

a = A()
        a.a = a
        a.wr = makeref(referenced)

try:
            # now make sure the object and the ref get labeled as
            # cyclic trash:
            a = A()
            weakref.ref(referenced, callback)

finally:
            gc.set_threshold(*thresholds)

def test_ref_created_during_del(self):
        # Bug #1377858
        # A weakref created in an object's __del__() would crash the
        # interpreter when the weakref was cleaned up since it would refer to
        # non-existent memory.  This test should not segfault the interpreter.
        class Target(object):
            def __del__(self):
                global ref_from_del
                ref_from_del = weakref.ref(self)

w = Target()

def test_init(self):
        # Issue 3634
        # <weakref to class>.__init__() doesn't check errors correctly
        r = weakref.ref(Exception)
        self.assertRaises(TypeError, r.__init__, 0, 0, 0, 0, 0)
        # No exception should be raised here
        gc.collect()

def test_classes(self):
        # Check that classes are weakrefable.
        class A(object):
            pass
        l = []
        weakref.ref(int)
        a = weakref.ref(A, l.append)
        A = None
        gc.collect()
        self.assertEqual(a(), None)
        self.assertEqual(l, [a])

def test_equality(self):
        # Alive weakrefs defer equality testing to their underlying object.
        x = Object(1)
        y = Object(1)
        z = Object(2)
        a = weakref.ref(x)
        b = weakref.ref(y)
        c = weakref.ref(z)
        d = weakref.ref(x)
        # Note how we directly test the operators here, to stress both
        # __eq__ and __ne__.
        self.assertTrue(a == b)
        self.assertFalse(a != b)
        self.assertFalse(a == c)
        self.assertTrue(a != c)
        self.assertTrue(a == d)
        self.assertFalse(a != d)
        del x, y, z
        gc.collect()
        for r in a, b, c:
            # Sanity check
            self.assertIs(r(), None)
        # Dead weakrefs compare by identity: whether `a` and `d` are the
        # same weakref object is an implementation detail, since they pointed
        # to the same original object and didn't have a callback.
        # (see issue #16453).
        self.assertFalse(a == b)
        self.assertTrue(a != b)
        self.assertFalse(a == c)
        self.assertTrue(a != c)
        self.assertEqual(a == d, a is d)
        self.assertEqual(a != d, a is not d)

def test_ordering(self):
        # weakrefs cannot be ordered, even if the underlying objects can.
        ops = [operator.lt, operator.gt, operator.le, operator.ge]
        x = Object(1)
        y = Object(1)
        a = weakref.ref(x)
        b = weakref.ref(y)
        for op in ops:
            self.assertRaises(TypeError, op, a, b)
        # Same when dead.
        del x, y
        gc.collect()
        for op in ops:
            self.assertRaises(TypeError, op, a, b)

def test_hashing(self):
        # Alive weakrefs hash the same as the underlying object
        x = Object(42)
        y = Object(42)
        a = weakref.ref(x)
        b = weakref.ref(y)
        self.assertEqual(hash(a), hash(42))
        del x, y
        gc.collect()
        # Dead weakrefs:
        # - retain their hash is they were hashed when alive;
        # - otherwise, cannot be hashed.
        self.assertEqual(hash(a), hash(42))
        self.assertRaises(TypeError, hash, b)

def test_trashcan_16602(self):
        # Issue #16602: when a weakref's target was part of a long
        # deallocation chain, the trashcan mechanism could delay clearing
        # of the weakref and make the target object visible from outside
        # code even though its refcount had dropped to 0.  A crash ensued.
        class C:
            def __init__(self, parent):
                if not parent:
                    return
                wself = weakref.ref(self)
                def cb(wparent):
                    o = wself()
                self.wparent = weakref.ref(parent, cb)

d = weakref.WeakKeyDictionary()
        root = c = C(None)
        for n in range(100):
            d[c] = c = C(c)
        del root
        gc.collect()

def test_callback_attribute(self):
        x = Object(1)
        callback = lambda ref: None
        ref1 = weakref.ref(x, callback)
        self.assertIs(ref1.__callback__, callback)

ref2 = weakref.ref(x)
        self.assertIsNone(ref2.__callback__)

def test_callback_attribute_after_deletion(self):
        x = Object(1)
        ref = weakref.ref(x, self.callback)
        self.assertIsNotNone(ref.__callback__)
        del x
        support.gc_collect()
        self.assertIsNone(ref.__callback__)

def test_set_callback_attribute(self):
        x = Object(1)
        callback = lambda ref: None
        ref1 = weakref.ref(x, callback)
        with self.assertRaises(AttributeError):
            ref1.__callback__ = lambda ref: None

def test_callback_gcs(self):
        class ObjectWithDel(Object):
            def __del__(self): pass
        x = ObjectWithDel(1)
        ref1 = weakref.ref(x, lambda ref: support.gc_collect())
        del x
        support.gc_collect()

class SubclassableWeakrefTestCase(TestBase):

def test_subclass_refs(self):
        class MyRef(weakref.ref):
            def __init__(self, ob, callback=None, value=42):
                self.value = value
                super().__init__(ob, callback)
            def __call__(self):
                self.called = True
                return super().__call__()
        o = Object("foo")
        mr = MyRef(o, value=24)
        self.assertIs(mr(), o)
        self.assertTrue(mr.called)
        self.assertEqual(mr.value, 24)
        del o
        self.assertIsNone(mr())
        self.assertTrue(mr.called)

def test_subclass_refs_dont_replace_standard_refs(self):
        class MyRef(weakref.ref):
            pass
        o = Object(42)
        r1 = MyRef(o)
        r2 = weakref.ref(o)
        self.assertIsNot(r1, r2)
        self.assertEqual(weakref.getweakrefs(o), [r2, r1])
        self.assertEqual(weakref.getweakrefcount(o), 2)
        r3 = MyRef(o)
        self.assertEqual(weakref.getweakrefcount(o), 3)
        refs = weakref.getweakrefs(o)
        self.assertEqual(len(refs), 3)
        self.assertIs(r2, refs[0])
        self.assertIn(r1, refs[1:])
        self.assertIn(r3, refs[1:])

def test_subclass_refs_dont_conflate_callbacks(self):
        class MyRef(weakref.ref):
            pass
        o = Object(42)
        r1 = MyRef(o, id)
        r2 = MyRef(o, str)
        self.assertIsNot(r1, r2)
        refs = weakref.getweakrefs(o)
        self.assertIn(r1, refs)
        self.assertIn(r2, refs)

def test_subclass_refs_with_slots(self):
        class MyRef(weakref.ref):
            __slots__ = "slot1", "slot2"
            def __new__(type, ob, callback, slot1, slot2):
                return weakref.ref.__new__(type, ob, callback)
            def __init__(self, ob, callback, slot1, slot2):
                self.slot1 = slot1
                self.slot2 = slot2
            def meth(self):
                return self.slot1 + self.slot2
        o = Object(42)
        r = MyRef(o, None, "abc", "def")
        self.assertEqual(r.slot1, "abc")
        self.assertEqual(r.slot2, "def")
        self.assertEqual(r.meth(), "abcdef")
        self.assertFalse(hasattr(r, "__dict__"))

def test_subclass_refs_with_cycle(self):
        """Confirm https://bugs.python.org/issue3100 is fixed."""
        # An instance of a weakref subclass can have attributes.
        # If such a weakref holds the only strong reference to the object,
        # deleting the weakref will delete the object. In this case,
        # the callback must not be called, because the ref object is
        # being deleted.
        class MyRef(weakref.ref):
            pass

# Use a local callback, for "regrtest -R::"
        # to detect refcounting problems
        def callback(w):
            self.cbcalled += 1

o = C()
        r1 = MyRef(o, callback)
        r1.o = o
        del o

del r1 # Used to crash here

self.assertEqual(self.cbcalled, 0)

# Same test, with two weakrefs to the same object
        # (since code paths are different)
        o = C()
        r1 = MyRef(o, callback)
        r2 = MyRef(o, callback)
        r1.r = r2
        r2.o = o
        del o
        del r2

del r1 # Used to crash here

self.assertEqual(self.cbcalled, 0)

class WeakMethodTestCase(unittest.TestCase):

def _subclass(self):
        """Return an Object subclass overriding `some_method`."""
        class C(Object):
            def some_method(self):
                return 6
        return C

def test_alive(self):
        o = Object(1)
        r = weakref.WeakMethod(o.some_method)
        self.assertIsInstance(r, weakref.ReferenceType)
        self.assertIsInstance(r(), type(o.some_method))
        self.assertIs(r().__self__, o)
        self.assertIs(r().__func__, o.some_method.__func__)
        self.assertEqual(r()(), 4)

def test_object_dead(self):
        o = Object(1)
        r = weakref.WeakMethod(o.some_method)
        del o
        gc.collect()
        self.assertIs(r(), None)

def test_method_dead(self):
        C = self._subclass()
        o = C(1)
        r = weakref.WeakMethod(o.some_method)
        del C.some_method
        gc.collect()
        self.assertIs(r(), None)

def test_callback_when_object_dead(self):
        # Test callback behaviour when object dies first.
        C = self._subclass()
        calls = []
        def cb(arg):
            calls.append(arg)
        o = C(1)
        r = weakref.WeakMethod(o.some_method, cb)
        del o
        gc.collect()
        self.assertEqual(calls, [r])
        # Callback is only called once.
        C.some_method = Object.some_method
        gc.collect()
        self.assertEqual(calls, [r])

def test_callback_when_method_dead(self):
        # Test callback behaviour when method dies first.
        C = self._subclass()
        calls = []
        def cb(arg):
            calls.append(arg)
        o = C(1)
        r = weakref.WeakMethod(o.some_method, cb)
        del C.some_method
        gc.collect()
        self.assertEqual(calls, [r])
        # Callback is only called once.
        del o
        gc.collect()
        self.assertEqual(calls, [r])

@support.cpython_only
    def test_no_cycles(self):
        # A WeakMethod doesn't create any reference cycle to itself.
        o = Object(1)
        def cb(_):
            pass
        r = weakref.WeakMethod(o.some_method, cb)
        wr = weakref.ref(r)
        del r
        self.assertIs(wr(), None)

def test_equality(self):
        def _eq(a, b):
            self.assertTrue(a == b)
            self.assertFalse(a != b)
        def _ne(a, b):
            self.assertTrue(a != b)
            self.assertFalse(a == b)
        x = Object(1)
        y = Object(1)
        a = weakref.WeakMethod(x.some_method)
        b = weakref.WeakMethod(y.some_method)
        c = weakref.WeakMethod(x.other_method)
        d = weakref.WeakMethod(y.other_method)
        # Objects equal, same method
        _eq(a, b)
        _eq(c, d)
        # Objects equal, different method
        _ne(a, c)
        _ne(a, d)
        _ne(b, c)
        _ne(b, d)
        # Objects unequal, same or different method
        z = Object(2)
        e = weakref.WeakMethod(z.some_method)
        f = weakref.WeakMethod(z.other_method)
        _ne(a, e)
        _ne(a, f)
        _ne(b, e)
        _ne(b, f)
        del x, y, z
        gc.collect()
        # Dead WeakMethods compare by identity
        refs = a, b, c, d, e, f
        for q in refs:
            for r in refs:
                self.assertEqual(q == r, q is r)
                self.assertEqual(q != r, q is not r)

def test_hashing(self):
        # Alive WeakMethods are hashable if the underlying object is
        # hashable.
        x = Object(1)
        y = Object(1)
        a = weakref.WeakMethod(x.some_method)
        b = weakref.WeakMethod(y.some_method)
        c = weakref.WeakMethod(y.other_method)
        # Since WeakMethod objects are equal, the hashes should be equal.
        self.assertEqual(hash(a), hash(b))
        ha = hash(a)
        # Dead WeakMethods retain their old hash value
        del x, y
        gc.collect()
        self.assertEqual(hash(a), ha)
        self.assertEqual(hash(b), ha)
        # If it wasn't hashed when alive, a dead WeakMethod cannot be hashed.
        self.assertRaises(TypeError, hash, c)

class MappingTestCase(TestBase):

COUNT = 10

def check_len_cycles(self, dict_type, cons):
        N = 20
        items = [RefCycle() for i in range(N)]
        dct = dict_type(cons(o) for o in items)
        # Keep an iterator alive
        it = dct.items()
        try:
            next(it)
        except StopIteration:
            pass
        del items
        gc.collect()
        n1 = len(dct)
        del it
        gc.collect()
        n2 = len(dct)
        # one item may be kept alive inside the iterator
        self.assertIn(n1, (0, 1))
        self.assertEqual(n2, 0)

def test_weak_keyed_len_cycles(self):
        self.check_len_cycles(weakref.WeakKeyDictionary, lambda k: (k, 1))

def test_weak_valued_len_cycles(self):
        self.check_len_cycles(weakref.WeakValueDictionary, lambda k: (1, k))

def check_len_race(self, dict_type, cons):
        # Extended sanity checks for len() in the face of cyclic collection
        self.addCleanup(gc.set_threshold, *gc.get_threshold())
        for th in range(1, 100):
            N = 20
            gc.collect(0)
            gc.set_threshold(th, th, th)
            items = [RefCycle() for i in range(N)]
            dct = dict_type(cons(o) for o in items)
            del items
            # All items will be collected at next garbage collection pass
            it = dct.items()
            try:
                next(it)
            except StopIteration:
                pass
            n1 = len(dct)
            del it
            n2 = len(dct)
            self.assertGreaterEqual(n1, 0)
            self.assertLessEqual(n1, N)
            self.assertGreaterEqual(n2, 0)
            self.assertLessEqual(n2, n1)

def test_weak_keyed_len_race(self):
        self.check_len_race(weakref.WeakKeyDictionary, lambda k: (k, 1))

def test_weak_valued_len_race(self):
        self.check_len_race(weakref.WeakValueDictionary, lambda k: (1, k))

def test_weak_values(self):
        #
        #  This exercises d.copy(), d.items(), d[], del d[], len(d).
        #
        dict, objects = self.make_weak_valued_dict()
        for o in objects:
            self.assertEqual(weakref.getweakrefcount(o), 1)
            self.assertIs(o, dict[o.arg],
                         "wrong object returned by weak dict!")
        items1 = list(dict.items())
        items2 = list(dict.copy().items())
        items1.sort()
        items2.sort()
        self.assertEqual(items1, items2,
                     "cloning of weak-valued dictionary did not work!")
        del items1, items2
        self.assertEqual(len(dict), self.COUNT)
        del objects[0]
        self.assertEqual(len(dict), self.COUNT - 1,
                     "deleting object did not cause dictionary update")
        del objects, o
        self.assertEqual(len(dict), 0,
                     "deleting the values did not clear the dictionary")
        # regression on SF bug #447152:
        dict = weakref.WeakValueDictionary()
        self.assertRaises(KeyError, dict.__getitem__, 1)
        dict[2] = C()
        self.assertRaises(KeyError, dict.__getitem__, 2)

def test_weak_keys(self):
        #
        #  This exercises d.copy(), d.items(), d[] = v, d[], del d[],
        #  len(d), k in d.
        #
        dict, objects = self.make_weak_keyed_dict()
        for o in objects:
            self.assertEqual(weakref.getweakrefcount(o), 1,
                         "wrong number of weak references to %r!" % o)
            self.assertIs(o.arg, dict[o],
                         "wrong object returned by weak dict!")
        items1 = dict.items()
        items2 = dict.copy().items()
        self.assertEqual(set(items1), set(items2),
                     "cloning of weak-keyed dictionary did not work!")
        del items1, items2
        self.assertEqual(len(dict), self.COUNT)
        del objects[0]
        self.assertEqual(len(dict), (self.COUNT - 1),
                     "deleting object did not cause dictionary update")
        del objects, o
        self.assertEqual(len(dict), 0,
                     "deleting the keys did not clear the dictionary")
        o = Object(42)
        dict[o] = "What is the meaning of the universe?"
        self.assertIn(o, dict)
        self.assertNotIn(34, dict)

def test_weak_keyed_iters(self):
        dict, objects = self.make_weak_keyed_dict()
        self.check_iters(dict)

# Test keyrefs()
        refs = dict.keyrefs()
        self.assertEqual(len(refs), len(objects))
        objects2 = list(objects)
        for wr in refs:
            ob = wr()
            self.assertIn(ob, dict)
            self.assertIn(ob, dict)
            self.assertEqual(ob.arg, dict[ob])
            objects2.remove(ob)
        self.assertEqual(len(objects2), 0)

# Test iterkeyrefs()
        objects2 = list(objects)
        self.assertEqual(len(list(dict.keyrefs())), len(objects))
        for wr in dict.keyrefs():
            ob = wr()
            self.assertIn(ob, dict)
            self.assertIn(ob, dict)
            self.assertEqual(ob.arg, dict[ob])
            objects2.remove(ob)
        self.assertEqual(len(objects2), 0)

def test_weak_valued_iters(self):
        dict, objects = self.make_weak_valued_dict()
        self.check_iters(dict)

# Test valuerefs()
        refs = dict.valuerefs()
        self.assertEqual(len(refs), len(objects))
        objects2 = list(objects)
        for wr in refs:
            ob = wr()
            self.assertEqual(ob, dict[ob.arg])
            self.assertEqual(ob.arg, dict[ob.arg].arg)
            objects2.remove(ob)
        self.assertEqual(len(objects2), 0)

# Test itervaluerefs()
        objects2 = list(objects)
        self.assertEqual(len(list(dict.itervaluerefs())), len(objects))
        for wr in dict.itervaluerefs():
            ob = wr()
            self.assertEqual(ob, dict[ob.arg])
            self.assertEqual(ob.arg, dict[ob.arg].arg)
            objects2.remove(ob)
        self.assertEqual(len(objects2), 0)

def check_iters(self, dict):
        # item iterator:
        items = list(dict.items())
        for item in dict.items():
            items.remove(item)
        self.assertFalse(items, "items() did not touch all items")

# key iterator, via __iter__():
        keys = list(dict.keys())
        for k in dict:
            keys.remove(k)
        self.assertFalse(keys, "__iter__() did not touch all keys")

# key iterator, via iterkeys():
        keys = list(dict.keys())
        for k in dict.keys():
            keys.remove(k)
        self.assertFalse(keys, "iterkeys() did not touch all keys")

# value iterator:
        values = list(dict.values())
        for v in dict.values():
            values.remove(v)
        self.assertFalse(values,
                     "itervalues() did not touch all values")

def check_weak_destroy_while_iterating(self, dict, objects, iter_name):
        n = len(dict)
        it = iter(getattr(dict, iter_name)())
        next(it)             # Trigger internal iteration
        # Destroy an object
        del objects[-1]
        gc.collect()    # just in case
        # We have removed either the first consumed object, or another one
        self.assertIn(len(list(it)), [len(objects), len(objects) - 1])
        del it
        # The removal has been committed
        self.assertEqual(len(dict), n - 1)

def check_weak_destroy_and_mutate_while_iterating(self, dict, testcontext):
        # Check that we can explicitly mutate the weak dict without
        # interfering with delayed removal.
        # `testcontext` should create an iterator, destroy one of the
        # weakref'ed objects and then return a new key/value pair corresponding
        # to the destroyed object.
        with testcontext() as (k, v):
            self.assertNotIn(k, dict)
        with testcontext() as (k, v):
            self.assertRaises(KeyError, dict.__delitem__, k)
        self.assertNotIn(k, dict)
        with testcontext() as (k, v):
            self.assertRaises(KeyError, dict.pop, k)
        self.assertNotIn(k, dict)
        with testcontext() as (k, v):
            dict[k] = v
        self.assertEqual(dict[k], v)
        ddict = copy.copy(dict)
        with testcontext() as (k, v):
            dict.update(ddict)
        self.assertEqual(dict, ddict)
        with testcontext() as (k, v):
            dict.clear()
        self.assertEqual(len(dict), 0)

def check_weak_del_and_len_while_iterating(self, dict, testcontext):
        # Check that len() works when both iterating and removing keys
        # explicitly through various means (.pop(), .clear()...), while
        # implicit mutation is deferred because an iterator is alive.
        # (each call to testcontext() should schedule one item for removal
        #  for this test to work properly)
        o = Object(123456)
        with testcontext():
            n = len(dict)
            # Since underlaying dict is ordered, first item is popped
            dict.pop(next(dict.keys()))
            self.assertEqual(len(dict), n - 1)
            dict[o] = o
            self.assertEqual(len(dict), n)
        # last item in objects is removed from dict in context shutdown
        with testcontext():
            self.assertEqual(len(dict), n - 1)
            # Then, (o, o) is popped
            dict.popitem()
            self.assertEqual(len(dict), n - 2)
        with testcontext():
            self.assertEqual(len(dict), n - 3)
            del dict[next(dict.keys())]
            self.assertEqual(len(dict), n - 4)
        with testcontext():
            self.assertEqual(len(dict), n - 5)
            dict.popitem()
            self.assertEqual(len(dict), n - 6)
        with testcontext():
            dict.clear()
            self.assertEqual(len(dict), 0)
        self.assertEqual(len(dict), 0)

def test_weak_keys_destroy_while_iterating(self):
        # Issue #7105: iterators shouldn't crash when a key is implicitly removed
        dict, objects = self.make_weak_keyed_dict()
        self.check_weak_destroy_while_iterating(dict, objects, 'keys')
        self.check_weak_destroy_while_iterating(dict, objects, 'items')
        self.check_weak_destroy_while_iterating(dict, objects, 'values')
        self.check_weak_destroy_while_iterating(dict, objects, 'keyrefs')
        dict, objects = self.make_weak_keyed_dict()
        @contextlib.contextmanager
        def testcontext():
            try:
                it = iter(dict.items())
                next(it)
                # Schedule a key/value for removal and recreate it
                v = objects.pop().arg
                gc.collect()      # just in case
                yield Object(v), v
            finally:
                it = None           # should commit all removals
                gc.collect()
        self.check_weak_destroy_and_mutate_while_iterating(dict, testcontext)
        # Issue #21173: len() fragile when keys are both implicitly and
        # explicitly removed.
        dict, objects = self.make_weak_keyed_dict()
        self.check_weak_del_and_len_while_iterating(dict, testcontext)

def test_weak_values_destroy_while_iterating(self):
        # Issue #7105: iterators shouldn't crash when a key is implicitly removed
        dict, objects = self.make_weak_valued_dict()
        self.check_weak_destroy_while_iterating(dict, objects, 'keys')
        self.check_weak_destroy_while_iterating(dict, objects, 'items')
        self.check_weak_destroy_while_iterating(dict, objects, 'values')
        self.check_weak_destroy_while_iterating(dict, objects, 'itervaluerefs')
        self.check_weak_destroy_while_iterating(dict, objects, 'valuerefs')
        dict, objects = self.make_weak_valued_dict()
        @contextlib.contextmanager
        def testcontext():
            try:
                it = iter(dict.items())
                next(it)
                # Schedule a key/value for removal and recreate it
                k = objects.pop().arg
                gc.collect()      # just in case
                yield k, Object(k)
            finally:
                it = None           # should commit all removals
                gc.collect()
        self.check_weak_destroy_and_mutate_while_iterating(dict, testcontext)
        dict, objects = self.make_weak_valued_dict()
        self.check_weak_del_and_len_while_iterating(dict, testcontext)

def test_make_weak_keyed_dict_from_dict(self):
        o = Object(3)
        dict = weakref.WeakKeyDictionary({o:364})
        self.assertEqual(dict[o], 364)

def test_make_weak_keyed_dict_from_weak_keyed_dict(self):
        o = Object(3)
        dict = weakref.WeakKeyDictionary({o:364})
        dict2 = weakref.WeakKeyDictionary(dict)
        self.assertEqual(dict[o], 364)

def make_weak_keyed_dict(self):
        dict = weakref.WeakKeyDictionary()
        objects = list(map(Object, range(self.COUNT)))
        for o in objects:
            dict[o] = o.arg
        return dict, objects

def test_make_weak_valued_dict_from_dict(self):
        o = Object(3)
        dict = weakref.WeakValueDictionary({364:o})
        self.assertEqual(dict[364], o)

def test_make_weak_valued_dict_from_weak_valued_dict(self):
        o = Object(3)
        dict = weakref.WeakValueDictionary({364:o})
        dict2 = weakref.WeakValueDictionary(dict)
        self.assertEqual(dict[364], o)

def test_make_weak_valued_dict_misc(self):
        # errors
        self.assertRaises(TypeError, weakref.WeakValueDictionary.__init__)
        self.assertRaises(TypeError, weakref.WeakValueDictionary, {}, {})
        self.assertRaises(TypeError, weakref.WeakValueDictionary, (), ())
        # special keyword arguments
        o = Object(3)
        for kw in 'self', 'dict', 'other', 'iterable':
            d = weakref.WeakValueDictionary(**{kw: o})
            self.assertEqual(list(d.keys()), [kw])
            self.assertEqual(d[kw], o)

def make_weak_valued_dict(self):
        dict = weakref.WeakValueDictionary()
        objects = list(map(Object, range(self.COUNT)))
        for o in objects:
            dict[o.arg] = o
        return dict, objects

def check_popitem(self, klass, key1, value1, key2, value2):
        weakdict = klass()
        weakdict[key1] = value1
        weakdict[key2] = value2
        self.assertEqual(len(weakdict), 2)
        k, v = weakdict.popitem()
        self.assertEqual(len(weakdict), 1)
        if k is key1:
            self.assertIs(v, value1)
        else:
            self.assertIs(v, value2)
        k, v = weakdict.popitem()
        self.assertEqual(len(weakdict), 0)
        if k is key1:
            self.assertIs(v, value1)
        else:
            self.assertIs(v, value2)

def test_weak_valued_dict_popitem(self):
        self.check_popitem(weakref.WeakValueDictionary,
                           "key1", C(), "key2", C())

def test_weak_keyed_dict_popitem(self):
        self.check_popitem(weakref.WeakKeyDictionary,
                           C(), "value 1", C(), "value 2")

def check_setdefault(self, klass, key, value1, value2):
        self.assertIsNot(value1, value2,
                     "invalid test"
                     " -- value parameters must be distinct objects")
        weakdict = klass()
        o = weakdict.setdefault(key, value1)
        self.assertIs(o, value1)
        self.assertIn(key, weakdict)
        self.assertIs(weakdict.get(key), value1)
        self.assertIs(weakdict[key], value1)

o = weakdict.setdefault(key, value2)
        self.assertIs(o, value1)
        self.assertIn(key, weakdict)
        self.assertIs(weakdict.get(key), value1)
        self.assertIs(weakdict[key], value1)

def test_weak_valued_dict_setdefault(self):
        self.check_setdefault(weakref.WeakValueDictionary,
                              "key", C(), C())

def test_weak_keyed_dict_setdefault(self):
        self.check_setdefault(weakref.WeakKeyDictionary,
                              C(), "value 1", "value 2")

def check_update(self, klass, dict):
        #
        #  This exercises d.update(), len(d), d.keys(), k in d,
        #  d.get(), d[].
        #
        weakdict = klass()
        weakdict.update(dict)
        self.assertEqual(len(weakdict), len(dict))
        for k in weakdict.keys():
            self.assertIn(k, dict, "mysterious new key appeared in weak dict")
            v = dict.get(k)
            self.assertIs(v, weakdict[k])
            self.assertIs(v, weakdict.get(k))
        for k in dict.keys():
            self.assertIn(k, weakdict, "original key disappeared in weak dict")
            v = dict[k]
            self.assertIs(v, weakdict[k])
            self.assertIs(v, weakdict.get(k))

def test_weak_valued_dict_update(self):
        self.check_update(weakref.WeakValueDictionary,
                          {1: C(), 'a': C(), C(): C()})
        # errors
        self.assertRaises(TypeError, weakref.WeakValueDictionary.update)
        d = weakref.WeakValueDictionary()
        self.assertRaises(TypeError, d.update, {}, {})
        self.assertRaises(TypeError, d.update, (), ())
        self.assertEqual(list(d.keys()), [])
        # special keyword arguments
        o = Object(3)
        for kw in 'self', 'dict', 'other', 'iterable':
            d = weakref.WeakValueDictionary()
            d.update(**{kw: o})
            self.assertEqual(list(d.keys()), [kw])
            self.assertEqual(d[kw], o)

def test_weak_keyed_dict_update(self):
        self.check_update(weakref.WeakKeyDictionary,
                          {C(): 1, C(): 2, C(): 3})

def test_weak_keyed_delitem(self):
        d = weakref.WeakKeyDictionary()
        o1 = Object('1')
        o2 = Object('2')
        d[o1] = 'something'
        d[o2] = 'something'
        self.assertEqual(len(d), 2)
        del d[o1]
        self.assertEqual(len(d), 1)
        self.assertEqual(list(d.keys()), [o2])

def test_weak_valued_delitem(self):
        d = weakref.WeakValueDictionary()
        o1 = Object('1')
        o2 = Object('2')
        d['something'] = o1
        d['something else'] = o2
        self.assertEqual(len(d), 2)
        del d['something']
        self.assertEqual(len(d), 1)
        self.assertEqual(list(d.items()), [('something else', o2)])

def test_weak_keyed_bad_delitem(self):
        d = weakref.WeakKeyDictionary()
        o = Object('1')
        # An attempt to delete an object that isn't there should raise
        # KeyError.  It didn't before 2.3.
        self.assertRaises(KeyError, d.__delitem__, o)
        self.assertRaises(KeyError, d.__getitem__, o)

# If a key isn't of a weakly referencable type, __getitem__ and
        # __setitem__ raise TypeError.  __delitem__ should too.
        self.assertRaises(TypeError, d.__delitem__,  13)
        self.assertRaises(TypeError, d.__getitem__,  13)
        self.assertRaises(TypeError, d.__setitem__,  13, 13)

def test_weak_keyed_cascading_deletes(self):
        # SF bug 742860.  For some reason, before 2.3 __delitem__ iterated
        # over the keys via self.data.iterkeys().  If things vanished from
        # the dict during this (or got added), that caused a RuntimeError.

d = weakref.WeakKeyDictionary()
        mutate = False

class C(object):
            def __init__(self, i):
                self.value = i
            def __hash__(self):
                return hash(self.value)
            def __eq__(self, other):
                if mutate:
                    # Side effect that mutates the dict, by removing the
                    # last strong reference to a key.
                    del objs[-1]
                return self.value == other.value

objs = [C(i) for i in range(4)]
        for o in objs:
            d[o] = o.value
        del o   # now the only strong references to keys are in objs
        # Find the order in which iterkeys sees the keys.
        objs = list(d.keys())
        # Reverse it, so that the iteration implementation of __delitem__
        # has to keep looping to find the first object we delete.
        objs.reverse()

# Turn on mutation in C.__eq__.  The first time through the loop,
        # under the iterkeys() business the first comparison will delete
        # the last item iterkeys() would see, and that causes a
        #     RuntimeError: dictionary changed size during iteration
        # when the iterkeys() loop goes around to try comparing the next
        # key.  After this was fixed, it just deletes the last object *our*
        # "for o in obj" loop would have gotten to.
        mutate = True
        count = 0
        for o in objs:
            count += 1
            del d[o]
        self.assertEqual(len(d), 0)
        self.assertEqual(count, 2)

def test_make_weak_valued_dict_repr(self):
        dict = weakref.WeakValueDictionary()
        self.assertRegex(repr(dict), '<WeakValueDictionary at 0x.*>')

def test_make_weak_keyed_dict_repr(self):
        dict = weakref.WeakKeyDictionary()
        self.assertRegex(repr(dict), '<WeakKeyDictionary at 0x.*>')

def test_threaded_weak_valued_setdefault(self):
        d = weakref.WeakValueDictionary()
        with collect_in_thread():
            for i in range(100000):
                x = d.setdefault(10, RefCycle())
                self.assertIsNot(x, None)  # we never put None in there!
                del x

def test_threaded_weak_valued_pop(self):
        d = weakref.WeakValueDictionary()
        with collect_in_thread():
            for i in range(100000):
                d[10] = RefCycle()
                x = d.pop(10, 10)
                self.assertIsNot(x, None)  # we never put None in there!

def test_threaded_weak_valued_consistency(self):
        # Issue #28427: old keys should not remove new values from
        # WeakValueDictionary when collecting from another thread.
        d = weakref.WeakValueDictionary()
        with collect_in_thread():
            for i in range(200000):
                o = RefCycle()
                d[10] = o
                # o is still alive, so the dict can't be empty
                self.assertEqual(len(d), 1)
                o = None  # lose ref

def check_threaded_weak_dict_copy(self, type_, deepcopy):
        # `type_` should be either WeakKeyDictionary or WeakValueDictionary.
        # `deepcopy` should be either True or False.
        exc = []

class DummyKey:
            def __init__(self, ctr):
                self.ctr = ctr

class DummyValue:
            def __init__(self, ctr):
                self.ctr = ctr

def dict_copy(d, exc):
            try:
                if deepcopy is True:
                    _ = copy.deepcopy(d)
                else:
                    _ = d.copy()
            except Exception as ex:
                exc.append(ex)

def pop_and_collect(lst):
            gc_ctr = 0
            while lst:
                i = random.randint(0, len(lst) - 1)
                gc_ctr += 1
                lst.pop(i)
                if gc_ctr % 10000 == 0:
                    gc.collect()  # just in case

self.assertIn(type_, (weakref.WeakKeyDictionary, weakref.WeakValueDictionary))

d = type_()
        keys = []
        values = []
        # Initialize d with many entries
        for i in range(70000):
            k, v = DummyKey(i), DummyValue(i)
            keys.append(k)
            values.append(v)
            d[k] = v
            del k
            del v

t_copy = threading.Thread(target=dict_copy, args=(d, exc,))
        if type_ is weakref.WeakKeyDictionary:
            t_collect = threading.Thread(target=pop_and_collect, args=(keys,))
        else:  # weakref.WeakValueDictionary
            t_collect = threading.Thread(target=pop_and_collect, args=(values,))

t_copy.start()
        t_collect.start()

t_copy.join()
        t_collect.join()

# Test exceptions
        if exc:
            raise exc[0]

def test_threaded_weak_key_dict_copy(self):
        # Issue #35615: Weakref keys or values getting GC'ed during dict
        # copying should not result in a crash.
        self.check_threaded_weak_dict_copy(weakref.WeakKeyDictionary, False)

def test_threaded_weak_key_dict_deepcopy(self):
        # Issue #35615: Weakref keys or values getting GC'ed during dict
        # copying should not result in a crash.
        self.check_threaded_weak_dict_copy(weakref.WeakKeyDictionary, True)

def test_threaded_weak_value_dict_copy(self):
        # Issue #35615: Weakref keys or values getting GC'ed during dict
        # copying should not result in a crash.
        self.check_threaded_weak_dict_copy(weakref.WeakValueDictionary, False)

def test_threaded_weak_value_dict_deepcopy(self):
        # Issue #35615: Weakref keys or values getting GC'ed during dict
        # copying should not result in a crash.
        self.check_threaded_weak_dict_copy(weakref.WeakValueDictionary, True)

@support.cpython_only
    def test_remove_closure(self):
        d = weakref.WeakValueDictionary()
        self.assertIsNone(d._remove.__closure__)

from test import mapping_tests

class WeakValueDictionaryTestCase(mapping_tests.BasicTestMappingProtocol):
    """Check that WeakValueDictionary conforms to the mapping protocol"""
    __ref = {"key1":Object(1), "key2":Object(2), "key3":Object(3)}
    type2test = weakref.WeakValueDictionary
    def _reference(self):
        return self.__ref.copy()

class WeakKeyDictionaryTestCase(mapping_tests.BasicTestMappingProtocol):
    """Check that WeakKeyDictionary conforms to the mapping protocol"""
    __ref = {Object("key1"):1, Object("key2"):2, Object("key3"):3}
    type2test = weakref.WeakKeyDictionary
    def _reference(self):
        return self.__ref.copy()

class FinalizeTestCase(unittest.TestCase):

class A:
        pass

def _collect_if_necessary(self):
        # we create no ref-cycles so in CPython no gc should be needed
        if sys.implementation.name != 'cpython':
            support.gc_collect()

def test_finalize(self):
        def add(x,y,z):
            res.append(x + y + z)
            return x + y + z

a = self.A()

res = []
        f = weakref.finalize(a, add, 67, 43, z=89)
        self.assertEqual(f.alive, True)
        self.assertEqual(f.peek(), (a, add, (67,43), {'z':89}))
        self.assertEqual(f(), 199)
        self.assertEqual(f(), None)
        self.assertEqual(f(), None)
        self.assertEqual(f.peek(), None)
        self.assertEqual(f.detach(), None)
        self.assertEqual(f.alive, False)
        self.assertEqual(res, [199])

res = []
        f = weakref.finalize(a, add, 67, 43, 89)
        self.assertEqual(f.peek(), (a, add, (67,43,89), {}))
        self.assertEqual(f.detach(), (a, add, (67,43,89), {}))
        self.assertEqual(f(), None)
        self.assertEqual(f(), None)
        self.assertEqual(f.peek(), None)
        self.assertEqual(f.detach(), None)
        self.assertEqual(f.alive, False)
        self.assertEqual(res, [])

res = []
        f = weakref.finalize(a, add, x=67, y=43, z=89)
        del a
        self._collect_if_necessary()
        self.assertEqual(f(), None)
        self.assertEqual(f(), None)
        self.assertEqual(f.peek(), None)
        self.assertEqual(f.detach(), None)
        self.assertEqual(f.alive, False)
        self.assertEqual(res, [199])

def test_arg_errors(self):
        def fin(*args, **kwargs):
            res.append((args, kwargs))

a = self.A()

res = []
        f = weakref.finalize(a, fin, 1, 2, func=3, obj=4)
        self.assertEqual(f.peek(), (a, fin, (1, 2), {'func': 3, 'obj': 4}))
        f()
        self.assertEqual(res, [((1, 2), {'func': 3, 'obj': 4})])

res = []
        with self.assertWarns(DeprecationWarning):
            f = weakref.finalize(a, func=fin, arg=1)
        self.assertEqual(f.peek(), (a, fin, (), {'arg': 1}))
        f()
        self.assertEqual(res, [((), {'arg': 1})])

res = []
        with self.assertWarns(DeprecationWarning):
            f = weakref.finalize(obj=a, func=fin, arg=1)
        self.assertEqual(f.peek(), (a, fin, (), {'arg': 1}))
        f()
        self.assertEqual(res, [((), {'arg': 1})])

self.assertRaises(TypeError, weakref.finalize, a)
        self.assertRaises(TypeError, weakref.finalize)

def test_order(self):
        a = self.A()
        res = []

f1 = weakref.finalize(a, res.append, 'f1')
        f2 = weakref.finalize(a, res.append, 'f2')
        f3 = weakref.finalize(a, res.append, 'f3')
        f4 = weakref.finalize(a, res.append, 'f4')
        f5 = weakref.finalize(a, res.append, 'f5')

# make sure finalizers can keep themselves alive
        del f1, f4

self.assertTrue(f2.alive)
        self.assertTrue(f3.alive)
        self.assertTrue(f5.alive)

self.assertTrue(f5.detach())
        self.assertFalse(f5.alive)

f5()                       # nothing because previously unregistered
        res.append('A')
        f3()                       # => res.append('f3')
        self.assertFalse(f3.alive)
        res.append('B')
        f3()                       # nothing because previously called
        res.append('C')
        del a
        self._collect_if_necessary()
                                   # => res.append('f4')
                                   # => res.append('f2')
                                   # => res.append('f1')
        self.assertFalse(f2.alive)
        res.append('D')
        f2()                       # nothing because previously called by gc

expected = ['A', 'f3', 'B', 'C', 'f4', 'f2', 'f1', 'D']
        self.assertEqual(res, expected)

def test_all_freed(self):
        # we want a weakrefable subclass of weakref.finalize
        class MyFinalizer(weakref.finalize):
            pass

a = self.A()
        res = []
        def callback():
            res.append(123)
        f = MyFinalizer(a, callback)

wr_callback = weakref.ref(callback)
        wr_f = weakref.ref(f)
        del callback, f

self.assertIsNotNone(wr_callback())
        self.assertIsNotNone(wr_f())

del a
        self._collect_if_necessary()

self.assertIsNone(wr_callback())
        self.assertIsNone(wr_f())
        self.assertEqual(res, [123])

@classmethod
    def run_in_child(cls):
        def error():
            # Create an atexit finalizer from inside a finalizer called
            # at exit.  This should be the next to be run.
            g1 = weakref.finalize(cls, print, 'g1')
            print('f3 error')
            1/0

# cls should stay alive till atexit callbacks run
        f1 = weakref.finalize(cls, print, 'f1', _global_var)
        f2 = weakref.finalize(cls, print, 'f2', _global_var)
        f3 = weakref.finalize(cls, error)
        f4 = weakref.finalize(cls, print, 'f4', _global_var)

assert f1.atexit == True
        f2.atexit = False
        assert f3.atexit == True
        assert f4.atexit == True

def test_atexit(self):
        prog = ('from test.test_weakref import FinalizeTestCase;'+
                'FinalizeTestCase.run_in_child()')
        rc, out, err = script_helper.assert_python_ok('-c', prog)
        out = out.decode('ascii').splitlines()
        self.assertEqual(out, ['f4 foobar', 'f3 error', 'g1', 'f1 foobar'])
        self.assertTrue(b'ZeroDivisionError' in err)

libreftest = """ Doctest for examples in the library reference: weakref.rst

>>> import weakref
>>> class Dict(dict):
...     pass
...
>>> obj = Dict(red=1, green=2, blue=3)   # this object is weak referencable
>>> r = weakref.ref(obj)
>>> print(r() is obj)
True

>>> import weakref
>>> class Object:
...     pass
...
>>> o = Object()
>>> r = weakref.ref(o)
>>> o2 = r()
>>> o is o2
True
>>> del o, o2
>>> print(r())
None

>>> import weakref
>>> class ExtendedRef(weakref.ref):
...     def __init__(self, ob, callback=None, **annotations):
...         super().__init__(ob, callback)
...         self.__counter = 0
...         for k, v in annotations.items():
...             setattr(self, k, v)
...     def __call__(self):
...         '''Return a pair containing the referent and the number of
...         times the reference has been called.
...         '''
...         ob = super().__call__()
...         if ob is not None:
...             self.__counter += 1
...             ob = (ob, self.__counter)
...         return ob
...
>>> class A:   # not in docs from here, just testing the ExtendedRef
...     pass
...
>>> a = A()
>>> r = ExtendedRef(a, foo=1, bar="baz")
>>> r.foo
1
>>> r.bar
'baz'
>>> r()[1]
1
>>> r()[1]
2
>>> r()[0] is a
True

>>> import weakref
>>> _id2obj_dict = weakref.WeakValueDictionary()
>>> def remember(obj):
...     oid = id(obj)
...     _id2obj_dict[oid] = obj
...     return oid
...
>>> def id2obj(oid):
...     return _id2obj_dict[oid]
...
>>> a = A()             # from here, just testing
>>> a_id = remember(a)
>>> id2obj(a_id) is a
True
>>> del a
>>> try:
...     id2obj(a_id)
... except KeyError:
...     print('OK')
... else:
...     print('WeakValueDictionary error')
OK

"""

__test__ = {'libreftest' : libreftest}

def test_main():
    support.run_unittest(
        ReferencesTestCase,
        WeakMethodTestCase,
        MappingTestCase,
        WeakValueDictionaryTestCase,
        WeakKeyDictionaryTestCase,
        SubclassableWeakrefTestCase,
        FinalizeTestCase,
        )
    support.run_doctest(sys.modules[__name__])

if __name__ == "__main__":
    test_main()

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