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Name	Size	Permission
audiodata	[ DIR ]	drwxr-xr-x
certdata	[ DIR ]	drwxr-xr-x
cjkencodings	[ DIR ]	drwxr-xr-x
configdata	[ DIR ]	drwxr-xr-x
crashers	[ DIR ]	drwxr-xr-x
data	[ DIR ]	drwxr-xr-x
decimaltestdata	[ DIR ]	drwxr-xr-x
dtracedata	[ DIR ]	drwxr-xr-x
encoded_modules	[ DIR ]	drwxr-xr-x
imghdrdata	[ DIR ]	drwxr-xr-x
leakers	[ DIR ]	drwxr-xr-x
libregrtest	[ DIR ]	drwxr-xr-x
regrtestdata	[ DIR ]	drwxr-xr-x
sndhdrdata	[ DIR ]	drwxr-xr-x
subprocessdata	[ DIR ]	drwxr-xr-x
support	[ DIR ]	drwxr-xr-x
test_asyncio	[ DIR ]	drwxr-xr-x
test_capi	[ DIR ]	drwxr-xr-x
test_concurrent_futures	[ DIR ]	drwxr-xr-x
test_cppext	[ DIR ]	drwxr-xr-x
test_ctypes	[ DIR ]	drwxr-xr-x
test_dataclasses	[ DIR ]	drwxr-xr-x
test_doctest	[ DIR ]	drwxr-xr-x
test_email	[ DIR ]	drwxr-xr-x
test_future_stmt	[ DIR ]	drwxr-xr-x
test_gdb	[ DIR ]	drwxr-xr-x
test_import	[ DIR ]	drwxr-xr-x
test_importlib	[ DIR ]	drwxr-xr-x
test_inspect	[ DIR ]	drwxr-xr-x
test_json	[ DIR ]	drwxr-xr-x
test_lib2to3	[ DIR ]	drwxr-xr-x
test_module	[ DIR ]	drwxr-xr-x
test_multiprocessing_fork	[ DIR ]	drwxr-xr-x
test_multiprocessing_forkserve...	[ DIR ]	drwxr-xr-x
test_multiprocessing_spawn	[ DIR ]	drwxr-xr-x
test_peg_generator	[ DIR ]	drwxr-xr-x
test_pydoc	[ DIR ]	drwxr-xr-x
test_sqlite3	[ DIR ]	drwxr-xr-x
test_tkinter	[ DIR ]	drwxr-xr-x
test_tomllib	[ DIR ]	drwxr-xr-x
test_tools	[ DIR ]	drwxr-xr-x
test_ttk	[ DIR ]	drwxr-xr-x
test_unittest	[ DIR ]	drwxr-xr-x
test_warnings	[ DIR ]	drwxr-xr-x
test_zipfile	[ DIR ]	drwxr-xr-x
test_zoneinfo	[ DIR ]	drwxr-xr-x
tokenizedata	[ DIR ]	drwxr-xr-x
tracedmodules	[ DIR ]	drwxr-xr-x
typinganndata	[ DIR ]	drwxr-xr-x
wheeldata	[ DIR ]	drwxr-xr-x
xmltestdata	[ DIR ]	drwxr-xr-x
ziptestdata	[ DIR ]	drwxr-xr-x
Sine-1000Hz-300ms.aif	60.25 KB	-rw-r--r--
__init__.py	47 B	-rw-r--r--
__main__.py	67 B	-rw-r--r--
_test_atexit.py	3.61 KB	-rw-r--r--
_test_eintr.py	17.75 KB	-rw-r--r--
_test_embed_set_config.py	8.64 KB	-rw-r--r--
_test_embed_structseq.py	1.99 KB	-rw-r--r--
_test_multiprocessing.py	206.66 KB	-rw-r--r--
_test_venv_multiprocessing.py	796 B	-rw-r--r--
archiver_tests.py	6.1 KB	-rw-r--r--
audiotest.au	27.48 KB	-rw-r--r--
audiotests.py	12.13 KB	-rw-r--r--
audit-tests.py	13.19 KB	-rw-r--r--
autotest.py	214 B	-rw-r--r--
badsyntax_pep3120.py	14 B	-rw-r--r--
bisect_cmd.py	5.34 KB	-rwxr-xr-x
clinic.test.c	138.59 KB	-rw-r--r--
cmath_testcases.txt	141.2 KB	-rw-r--r--
curses_tests.py	1.21 KB	-rwxr-xr-x
datetimetester.py	260.28 KB	-rw-r--r--
dis_module.py	76 B	-rw-r--r--
empty.vbs	70 B	-rw-r--r--
exception_hierarchy.txt	2.33 KB	-rw-r--r--
floating_points.txt	15.92 KB	-rw-r--r--
fork_wait.py	2.29 KB	-rw-r--r--
formatfloat_testcases.txt	7.45 KB	-rw-r--r--
ieee754.txt	3.15 KB	-rw-r--r--
levenshtein_examples.json	406.44 KB	-rw-r--r--
list_tests.py	16.64 KB	-rw-r--r--
lock_tests.py	35.48 KB	-rw-r--r--
mailcap.txt	1.24 KB	-rw-r--r--
mapping_tests.py	21.87 KB	-rw-r--r--
math_testcases.txt	23.19 KB	-rw-r--r--
memory_watchdog.py	711 B	-rw-r--r--
mime.types	47.37 KB	-rw-r--r--
mock_socket.py	3.69 KB	-rw-r--r--
mp_fork_bomb.py	448 B	-rw-r--r--
mp_preload.py	351 B	-rw-r--r--
multibytecodec_support.py	14.19 KB	-rw-r--r--
pickletester.py	143.84 KB	-rw-r--r--
profilee.py	2.97 KB	-rw-r--r--
pstats.pck	65.05 KB	-rw-r--r--
pyclbr_input.py	648 B	-rw-r--r--
pythoninfo.py	28.32 KB	-rw-r--r--
randv2_32.pck	7.34 KB	-rw-r--r--
randv2_64.pck	7.19 KB	-rw-r--r--
randv3.pck	7.82 KB	-rw-r--r--
re_tests.py	25.93 KB	-rwxr-xr-x
recursion.tar	516 B	-rw-r--r--
regrtest.py	1.27 KB	-rwxr-xr-x
relimport.py	27 B	-rw-r--r--
reperf.py	538 B	-rw-r--r--
seq_tests.py	14.96 KB	-rw-r--r--
signalinterproctester.py	3.12 KB	-rw-r--r--
ssl_servers.py	7.12 KB	-rw-r--r--
ssltests.py	1.03 KB	-rw-r--r--
string_tests.py	71.24 KB	-rw-r--r--
test___all__.py	5.04 KB	-rw-r--r--
test__locale.py	8.09 KB	-rw-r--r--
test__opcode.py	4.14 KB	-rw-r--r--
test__osx_support.py	13.62 KB	-rw-r--r--
test__xxinterpchannels.py	52.19 KB	-rw-r--r--
test__xxsubinterpreters.py	27.5 KB	-rw-r--r--
test_abc.py	23.81 KB	-rw-r--r--
test_abstract_numbers.py	5.81 KB	-rw-r--r--
test_aifc.py	17.84 KB	-rw-r--r--
test_argparse.py	189 KB	-rw-r--r--
test_array.py	55.27 KB	-rwxr-xr-x
test_asdl_parser.py	4.44 KB	-rw-r--r--
test_ast.py	140.71 KB	-rw-r--r--
test_asyncgen.py	47.39 KB	-rw-r--r--
test_atexit.py	3.2 KB	-rw-r--r--
test_audioop.py	28.32 KB	-rw-r--r--
test_audit.py	8.6 KB	-rw-r--r--
test_augassign.py	7.68 KB	-rw-r--r--
test_base64.py	35.05 KB	-rw-r--r--
test_baseexception.py	7.77 KB	-rw-r--r--
test_bdb.py	43.75 KB	-rw-r--r--
test_bigaddrspace.py	2.83 KB	-rw-r--r--
test_bigmem.py	45.01 KB	-rw-r--r--
test_binascii.py	19.35 KB	-rw-r--r--
test_binop.py	14.14 KB	-rw-r--r--
test_bisect.py	16.63 KB	-rw-r--r--
test_bool.py	14.25 KB	-rw-r--r--
test_buffer.py	171.31 KB	-rw-r--r--
test_bufio.py	2.56 KB	-rw-r--r--
test_builtin.py	95.14 KB	-rw-r--r--
test_bytes.py	80.57 KB	-rw-r--r--
test_bz2.py	42.61 KB	-rw-r--r--
test_c_locale_coercion.py	20.99 KB	-rw-r--r--
test_calendar.py	51.25 KB	-rw-r--r--
test_call.py	35.21 KB	-rw-r--r--
test_cgi.py	22.27 KB	-rw-r--r--
test_cgitb.py	2.62 KB	-rw-r--r--
test_charmapcodec.py	1.77 KB	-rw-r--r--
test_class.py	19.77 KB	-rw-r--r--
test_clinic.py	83.96 KB	-rw-r--r--
test_cmath.py	23.55 KB	-rw-r--r--
test_cmd.py	6.49 KB	-rw-r--r--
test_cmd_line.py	39.51 KB	-rw-r--r--
test_cmd_line_script.py	34.93 KB	-rw-r--r--
test_code.py	25.7 KB	-rw-r--r--
test_code_module.py	5.53 KB	-rw-r--r--
test_codeccallbacks.py	47.43 KB	-rw-r--r--
test_codecencodings_cn.py	3.86 KB	-rw-r--r--
test_codecencodings_hk.py	701 B	-rw-r--r--
test_codecencodings_iso2022.py	3.65 KB	-rw-r--r--
test_codecencodings_jp.py	4.79 KB	-rw-r--r--
test_codecencodings_kr.py	2.96 KB	-rw-r--r--
test_codecencodings_tw.py	681 B	-rw-r--r--
test_codecmaps_cn.py	746 B	-rw-r--r--
test_codecmaps_hk.py	386 B	-rw-r--r--
test_codecmaps_jp.py	1.7 KB	-rw-r--r--
test_codecmaps_kr.py	1.16 KB	-rw-r--r--
test_codecmaps_tw.py	705 B	-rw-r--r--
test_codecs.py	136.12 KB	-rw-r--r--
test_codeop.py	8.68 KB	-rw-r--r--
test_collections.py	93.47 KB	-rw-r--r--
test_colorsys.py	4.27 KB	-rw-r--r--
test_compare.py	17.46 KB	-rw-r--r--
test_compile.py	78.68 KB	-rw-r--r--
test_compileall.py	48.27 KB	-rw-r--r--
test_compiler_assemble.py	2.46 KB	-rw-r--r--
test_compiler_codegen.py	1.69 KB	-rw-r--r--
test_complex.py	35.37 KB	-rw-r--r--
test_configparser.py	85.34 KB	-rw-r--r--
test_contains.py	3.35 KB	-rw-r--r--
test_context.py	30.78 KB	-rw-r--r--
test_contextlib.py	43.12 KB	-rw-r--r--
test_contextlib_async.py	23.99 KB	-rw-r--r--
test_copy.py	26.52 KB	-rw-r--r--
test_copyreg.py	4.36 KB	-rw-r--r--
test_coroutines.py	67.47 KB	-rw-r--r--
test_cprofile.py	7.36 KB	-rw-r--r--
test_crashers.py	1.17 KB	-rw-r--r--
test_crypt.py	4.19 KB	-rw-r--r--
test_csv.py	61.27 KB	-rw-r--r--
test_curses.py	49.54 KB	-rw-r--r--
test_datetime.py	2.53 KB	-rw-r--r--
test_dbm.py	6.83 KB	-rw-r--r--
test_dbm_dumb.py	11.08 KB	-rw-r--r--
test_dbm_gnu.py	7.24 KB	-rw-r--r--
test_dbm_ndbm.py	5.91 KB	-rw-r--r--
test_decimal.py	216.13 KB	-rw-r--r--
test_decorators.py	14.63 KB	-rw-r--r--
test_defaultdict.py	6.1 KB	-rw-r--r--
test_deque.py	33.16 KB	-rw-r--r--
test_descr.py	196.13 KB	-rw-r--r--
test_descrtut.py	10.98 KB	-rw-r--r--
test_devpoll.py	4.44 KB	-rw-r--r--
test_dict.py	50.92 KB	-rw-r--r--
test_dict_version.py	6.1 KB	-rw-r--r--
test_dictcomps.py	5.15 KB	-rw-r--r--
test_dictviews.py	14.82 KB	-rw-r--r--
test_difflib.py	21.47 KB	-rw-r--r--
test_difflib_expect.html	100.85 KB	-rw-r--r--
test_dis.py	83 KB	-rw-r--r--
test_docxmlrpc.py	9.1 KB	-rw-r--r--
test_dtrace.py	7.98 KB	-rw-r--r--
test_dynamic.py	6 KB	-rw-r--r--
test_dynamicclassattribute.py	9.57 KB	-rw-r--r--
test_eintr.py	627 B	-rw-r--r--
test_embed.py	69.41 KB	-rw-r--r--
test_ensurepip.py	11.49 KB	-rw-r--r--
test_enum.py	186.78 KB	-rw-r--r--
test_enumerate.py	9.14 KB	-rw-r--r--
test_eof.py	3.1 KB	-rw-r--r--
test_epoll.py	9.4 KB	-rw-r--r--
test_errno.py	1.04 KB	-rw-r--r--
test_except_star.py	38.25 KB	-rw-r--r--
test_exception_group.py	34.03 KB	-rw-r--r--
test_exception_hierarchy.py	7.54 KB	-rw-r--r--
test_exception_variations.py	13.74 KB	-rw-r--r--
test_exceptions.py	76.46 KB	-rw-r--r--
test_extcall.py	14.69 KB	-rw-r--r--
test_faulthandler.py	30.31 KB	-rw-r--r--
test_fcntl.py	7.76 KB	-rw-r--r--
test_file.py	11.78 KB	-rw-r--r--
test_file_eintr.py	10.74 KB	-rw-r--r--
test_filecmp.py	10.33 KB	-rw-r--r--
test_fileinput.py	37.85 KB	-rw-r--r--
test_fileio.py	19.98 KB	-rw-r--r--
test_fileutils.py	951 B	-rw-r--r--
test_finalization.py	14.66 KB	-rw-r--r--
test_float.py	64.76 KB	-rw-r--r--
test_flufl.py	1.53 KB	-rw-r--r--
test_fnmatch.py	10.68 KB	-rw-r--r--
test_fork1.py	3.3 KB	-rw-r--r--
test_format.py	28.44 KB	-rw-r--r--
test_fractions.py	52.53 KB	-rw-r--r--
test_frame.py	14.04 KB	-rw-r--r--
test_frozen.py	2.2 KB	-rw-r--r--
test_fstring.py	64.71 KB	-rw-r--r--
test_ftplib.py	41.94 KB	-rw-r--r--
test_funcattrs.py	15.57 KB	-rw-r--r--
test_functools.py	109.31 KB	-rw-r--r--
test_gc.py	47.71 KB	-rw-r--r--
test_generator_stop.py	943 B	-rw-r--r--
test_generators.py	66.13 KB	-rw-r--r--
test_genericalias.py	17.78 KB	-rw-r--r--
test_genericclass.py	9.44 KB	-rw-r--r--
test_genericpath.py	22.29 KB	-rw-r--r--
test_genexps.py	7.3 KB	-rw-r--r--
test_getopt.py	6.6 KB	-rw-r--r--
test_getpass.py	6.37 KB	-rw-r--r--
test_getpath.py	44.36 KB	-rw-r--r--
test_gettext.py	35.67 KB	-rw-r--r--
test_glob.py	17.19 KB	-rw-r--r--
test_global.py	1.2 KB	-rw-r--r--
test_grammar.py	65.97 KB	-rw-r--r--
test_graphlib.py	8.31 KB	-rw-r--r--
test_grp.py	3.67 KB	-rw-r--r--
test_gzip.py	40.94 KB	-rw-r--r--
test_hash.py	12.11 KB	-rw-r--r--
test_hashlib.py	46.71 KB	-rw-r--r--
test_heapq.py	16.42 KB	-rw-r--r--
test_hmac.py	26.06 KB	-rw-r--r--
test_html.py	4.23 KB	-rw-r--r--
test_htmlparser.py	33.37 KB	-rw-r--r--
test_http_cookiejar.py	81.57 KB	-rw-r--r--
test_http_cookies.py	18.7 KB	-rw-r--r--
test_httplib.py	96.14 KB	-rw-r--r--
test_httpservers.py	56.43 KB	-rw-r--r--
test_idle.py	831 B	-rw-r--r--
test_imaplib.py	41.69 KB	-rw-r--r--
test_imghdr.py	4.81 KB	-rw-r--r--
test_index.py	8.37 KB	-rw-r--r--
test_int.py	33.34 KB	-rw-r--r--
test_int_literal.py	6.89 KB	-rw-r--r--
test_interpreters.py	32.11 KB	-rw-r--r--
test_io.py	182.76 KB	-rw-r--r--
test_ioctl.py	3.24 KB	-rw-r--r--
test_ipaddress.py	119.17 KB	-rw-r--r--
test_isinstance.py	12.95 KB	-rw-r--r--
test_iter.py	36.77 KB	-rw-r--r--
test_iterlen.py	7.1 KB	-rw-r--r--
test_itertools.py	106.61 KB	-rw-r--r--
test_keyword.py	2 KB	-rw-r--r--
test_keywordonlyarg.py	6.89 KB	-rw-r--r--
test_kqueue.py	9.36 KB	-rw-r--r--
test_largefile.py	10.17 KB	-rw-r--r--
test_launcher.py	27.23 KB	-rw-r--r--
test_linecache.py	11.04 KB	-rw-r--r--
test_list.py	8.93 KB	-rw-r--r--
test_listcomps.py	20.71 KB	-rw-r--r--
test_lltrace.py	3.71 KB	-rw-r--r--
test_locale.py	24.43 KB	-rw-r--r--
test_logging.py	241.62 KB	-rw-r--r--
test_long.py	63.33 KB	-rw-r--r--
test_longexp.py	233 B	-rw-r--r--
test_lzma.py	92.65 KB	-rw-r--r--
test_mailbox.py	93.91 KB	-rw-r--r--
test_mailcap.py	11.48 KB	-rw-r--r--
test_marshal.py	23.15 KB	-rw-r--r--
test_math.py	107.6 KB	-rw-r--r--
test_math_property.py	1.15 KB	-rw-r--r--
test_memoryio.py	32.65 KB	-rw-r--r--
test_memoryview.py	21.76 KB	-rw-r--r--
test_metaclass.py	6.19 KB	-rw-r--r--
test_mimetypes.py	15.28 KB	-rw-r--r--
test_minidom.py	68.42 KB	-rw-r--r--
test_mmap.py	38.56 KB	-rw-r--r--
test_modulefinder.py	12.21 KB	-rw-r--r--
test_monitoring.py	55.76 KB	-rw-r--r--
test_msilib.py	5.52 KB	-rw-r--r--
test_multibytecodec.py	15.79 KB	-rw-r--r--
test_multiprocessing_main_hand...	11.48 KB	-rw-r--r--
test_named_expressions.py	29.62 KB	-rw-r--r--
test_netrc.py	11.86 KB	-rw-r--r--
test_nis.py	1.25 KB	-rw-r--r--
test_nntplib.py	62.7 KB	-rw-r--r--
test_ntpath.py	52.48 KB	-rw-r--r--
test_numeric_tower.py	8 KB	-rw-r--r--
test_opcache.py	10.89 KB	-rw-r--r--
test_opcodes.py	3.62 KB	-rw-r--r--
test_openpty.py	600 B	-rw-r--r--
test_operator.py	26.72 KB	-rw-r--r--
test_optparse.py	61.02 KB	-rw-r--r--
test_ordered_dict.py	35.62 KB	-rw-r--r--
test_os.py	179.95 KB	-rw-r--r--
test_ossaudiodev.py	7.27 KB	-rw-r--r--
test_osx_env.py	1.31 KB	-rw-r--r--
test_pathlib.py	137.81 KB	-rw-r--r--
test_patma.py	86.03 KB	-rw-r--r--
test_pdb.py	86.53 KB	-rw-r--r--
test_peepholer.py	40.6 KB	-rw-r--r--
test_pep646_syntax.py	7.79 KB	-rw-r--r--
test_perf_profiler.py	11.27 KB	-rw-r--r--
test_perfmaps.py	685 B	-rw-r--r--
test_pickle.py	20.75 KB	-rw-r--r--
test_picklebuffer.py	4.99 KB	-rw-r--r--
test_pickletools.py	4.13 KB	-rw-r--r--
test_pipes.py	6.79 KB	-rw-r--r--
test_pkg.py	9.59 KB	-rw-r--r--
test_pkgutil.py	22.36 KB	-rw-r--r--
test_platform.py	21.59 KB	-rw-r--r--
test_plistlib.py	41.25 KB	-rw-r--r--
test_poll.py	7.39 KB	-rw-r--r--
test_popen.py	2.11 KB	-rw-r--r--
test_poplib.py	17.05 KB	-rw-r--r--
test_positional_only_arg.py	18.44 KB	-rw-r--r--
test_posix.py	95.07 KB	-rw-r--r--
test_posixpath.py	33.75 KB	-rw-r--r--
test_pow.py	6.38 KB	-rw-r--r--
test_pprint.py	50.59 KB	-rw-r--r--
test_print.py	7.72 KB	-rw-r--r--
test_profile.py	8.69 KB	-rw-r--r--
test_property.py	18.03 KB	-rw-r--r--
test_pstats.py	4.31 KB	-rw-r--r--
test_pty.py	16.18 KB	-rw-r--r--
test_pulldom.py	12.33 KB	-rw-r--r--
test_pwd.py	4.32 KB	-rw-r--r--
test_py_compile.py	11.93 KB	-rw-r--r--
test_pyclbr.py	10.15 KB	-rw-r--r--
test_pyexpat.py	29.35 KB	-rw-r--r--
test_queue.py	20.61 KB	-rw-r--r--
test_quopri.py	7.87 KB	-rw-r--r--
test_raise.py	13.44 KB	-rw-r--r--
test_random.py	56.69 KB	-rw-r--r--
test_range.py	26.53 KB	-rw-r--r--
test_re.py	131.37 KB	-rw-r--r--
test_readline.py	12.76 KB	-rw-r--r--
test_regrtest.py	90.02 KB	-rw-r--r--
test_repl.py	4.99 KB	-rw-r--r--
test_reprlib.py	27.77 KB	-rw-r--r--
test_resource.py	7.12 KB	-rw-r--r--
test_richcmp.py	11.95 KB	-rw-r--r--
test_rlcompleter.py	7.4 KB	-rw-r--r--
test_robotparser.py	11.02 KB	-rw-r--r--
test_runpy.py	33.95 KB	-rw-r--r--
test_sax.py	54.63 KB	-rw-r--r--
test_sched.py	7.38 KB	-rw-r--r--
test_scope.py	21.21 KB	-rw-r--r--
test_script_helper.py	5.82 KB	-rw-r--r--
test_secrets.py	4.28 KB	-rw-r--r--
test_select.py	3.42 KB	-rw-r--r--
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Code Editor : test_contextlib.py

"""Unit tests for contextlib.py, and other context managers."""

import io
import os
import sys
import tempfile
import threading
import traceback
import unittest
from contextlib import *  # Tests __all__
from test import support
from test.support import os_helper
from test.support.testcase import ExceptionIsLikeMixin
import weakref

class TestAbstractContextManager(unittest.TestCase):

def test_enter(self):
        class DefaultEnter(AbstractContextManager):
            def __exit__(self, *args):
                super().__exit__(*args)

manager = DefaultEnter()
        self.assertIs(manager.__enter__(), manager)

def test_exit_is_abstract(self):
        class MissingExit(AbstractContextManager):
            pass

with self.assertRaises(TypeError):
            MissingExit()

def test_structural_subclassing(self):
        class ManagerFromScratch:
            def __enter__(self):
                return self
            def __exit__(self, exc_type, exc_value, traceback):
                return None

self.assertTrue(issubclass(ManagerFromScratch, AbstractContextManager))

class DefaultEnter(AbstractContextManager):
            def __exit__(self, *args):
                super().__exit__(*args)

self.assertTrue(issubclass(DefaultEnter, AbstractContextManager))

class NoEnter(ManagerFromScratch):
            __enter__ = None

self.assertFalse(issubclass(NoEnter, AbstractContextManager))

class NoExit(ManagerFromScratch):
            __exit__ = None

self.assertFalse(issubclass(NoExit, AbstractContextManager))

class ContextManagerTestCase(unittest.TestCase):

def test_contextmanager_plain(self):
        state = []
        @contextmanager
        def woohoo():
            state.append(1)
            yield 42
            state.append(999)
        with woohoo() as x:
            self.assertEqual(state, [1])
            self.assertEqual(x, 42)
            state.append(x)
        self.assertEqual(state, [1, 42, 999])

def test_contextmanager_finally(self):
        state = []
        @contextmanager
        def woohoo():
            state.append(1)
            try:
                yield 42
            finally:
                state.append(999)
        with self.assertRaises(ZeroDivisionError):
            with woohoo() as x:
                self.assertEqual(state, [1])
                self.assertEqual(x, 42)
                state.append(x)
                raise ZeroDivisionError()
        self.assertEqual(state, [1, 42, 999])

def test_contextmanager_traceback(self):
        @contextmanager
        def f():
            yield

try:
            with f():
                1/0
        except ZeroDivisionError as e:
            frames = traceback.extract_tb(e.__traceback__)

self.assertEqual(len(frames), 1)
        self.assertEqual(frames[0].name, 'test_contextmanager_traceback')
        self.assertEqual(frames[0].line, '1/0')

# Repeat with RuntimeError (which goes through a different code path)
        class RuntimeErrorSubclass(RuntimeError):
            pass

try:
            with f():
                raise RuntimeErrorSubclass(42)
        except RuntimeErrorSubclass as e:
            frames = traceback.extract_tb(e.__traceback__)

self.assertEqual(len(frames), 1)
        self.assertEqual(frames[0].name, 'test_contextmanager_traceback')
        self.assertEqual(frames[0].line, 'raise RuntimeErrorSubclass(42)')

class StopIterationSubclass(StopIteration):
            pass

for stop_exc in (
            StopIteration('spam'),
            StopIterationSubclass('spam'),
        ):
            with self.subTest(type=type(stop_exc)):
                try:
                    with f():
                        raise stop_exc
                except type(stop_exc) as e:
                    self.assertIs(e, stop_exc)
                    frames = traceback.extract_tb(e.__traceback__)
                else:
                    self.fail(f'{stop_exc} was suppressed')

self.assertEqual(len(frames), 1)
                self.assertEqual(frames[0].name, 'test_contextmanager_traceback')
                self.assertEqual(frames[0].line, 'raise stop_exc')

def test_contextmanager_no_reraise(self):
        @contextmanager
        def whee():
            yield
        ctx = whee()
        ctx.__enter__()
        # Calling __exit__ should not result in an exception
        self.assertFalse(ctx.__exit__(TypeError, TypeError("foo"), None))

def test_contextmanager_trap_yield_after_throw(self):
        @contextmanager
        def whoo():
            try:
                yield
            except:
                yield
        ctx = whoo()
        ctx.__enter__()
        with self.assertRaises(RuntimeError):
            ctx.__exit__(TypeError, TypeError("foo"), None)
        if support.check_impl_detail(cpython=True):
            # The "gen" attribute is an implementation detail.
            self.assertFalse(ctx.gen.gi_suspended)

def test_contextmanager_trap_no_yield(self):
        @contextmanager
        def whoo():
            if False:
                yield
        ctx = whoo()
        with self.assertRaises(RuntimeError):
            ctx.__enter__()

def test_contextmanager_trap_second_yield(self):
        @contextmanager
        def whoo():
            yield
            yield
        ctx = whoo()
        ctx.__enter__()
        with self.assertRaises(RuntimeError):
            ctx.__exit__(None, None, None)
        if support.check_impl_detail(cpython=True):
            # The "gen" attribute is an implementation detail.
            self.assertFalse(ctx.gen.gi_suspended)

def test_contextmanager_non_normalised(self):
        @contextmanager
        def whoo():
            try:
                yield
            except RuntimeError:
                raise SyntaxError

ctx = whoo()
        ctx.__enter__()
        with self.assertRaises(SyntaxError):
            ctx.__exit__(RuntimeError, None, None)

def test_contextmanager_except(self):
        state = []
        @contextmanager
        def woohoo():
            state.append(1)
            try:
                yield 42
            except ZeroDivisionError as e:
                state.append(e.args[0])
                self.assertEqual(state, [1, 42, 999])
        with woohoo() as x:
            self.assertEqual(state, [1])
            self.assertEqual(x, 42)
            state.append(x)
            raise ZeroDivisionError(999)
        self.assertEqual(state, [1, 42, 999])

def test_contextmanager_except_stopiter(self):
        @contextmanager
        def woohoo():
            yield

class StopIterationSubclass(StopIteration):
            pass

for stop_exc in (StopIteration('spam'), StopIterationSubclass('spam')):
            with self.subTest(type=type(stop_exc)):
                try:
                    with woohoo():
                        raise stop_exc
                except Exception as ex:
                    self.assertIs(ex, stop_exc)
                else:
                    self.fail(f'{stop_exc} was suppressed')

def test_contextmanager_except_pep479(self):
        code = """\
from __future__ import generator_stop
from contextlib import contextmanager
@contextmanager
def woohoo():
    yield
"""
        locals = {}
        exec(code, locals, locals)
        woohoo = locals['woohoo']

stop_exc = StopIteration('spam')
        try:
            with woohoo():
                raise stop_exc
        except Exception as ex:
            self.assertIs(ex, stop_exc)
        else:
            self.fail('StopIteration was suppressed')

def test_contextmanager_do_not_unchain_non_stopiteration_exceptions(self):
        @contextmanager
        def test_issue29692():
            try:
                yield
            except Exception as exc:
                raise RuntimeError('issue29692:Chained') from exc
        try:
            with test_issue29692():
                raise ZeroDivisionError
        except Exception as ex:
            self.assertIs(type(ex), RuntimeError)
            self.assertEqual(ex.args[0], 'issue29692:Chained')
            self.assertIsInstance(ex.__cause__, ZeroDivisionError)

try:
            with test_issue29692():
                raise StopIteration('issue29692:Unchained')
        except Exception as ex:
            self.assertIs(type(ex), StopIteration)
            self.assertEqual(ex.args[0], 'issue29692:Unchained')
            self.assertIsNone(ex.__cause__)

def test_contextmanager_wrap_runtimeerror(self):
        @contextmanager
        def woohoo():
            try:
                yield
            except Exception as exc:
                raise RuntimeError(f'caught {exc}') from exc

with self.assertRaises(RuntimeError):
            with woohoo():
                1 / 0

# If the context manager wrapped StopIteration in a RuntimeError,
        # we also unwrap it, because we can't tell whether the wrapping was
        # done by the generator machinery or by the generator itself.
        with self.assertRaises(StopIteration):
            with woohoo():
                raise StopIteration

def _create_contextmanager_attribs(self):
        def attribs(**kw):
            def decorate(func):
                for k,v in kw.items():
                    setattr(func,k,v)
                return func
            return decorate
        @contextmanager
        @attribs(foo='bar')
        def baz(spam):
            """Whee!"""
            yield
        return baz

def test_contextmanager_attribs(self):
        baz = self._create_contextmanager_attribs()
        self.assertEqual(baz.__name__,'baz')
        self.assertEqual(baz.foo, 'bar')

@support.requires_docstrings
    def test_contextmanager_doc_attrib(self):
        baz = self._create_contextmanager_attribs()
        self.assertEqual(baz.__doc__, "Whee!")

@support.requires_docstrings
    def test_instance_docstring_given_cm_docstring(self):
        baz = self._create_contextmanager_attribs()(None)
        self.assertEqual(baz.__doc__, "Whee!")

def test_keywords(self):
        # Ensure no keyword arguments are inhibited
        @contextmanager
        def woohoo(self, func, args, kwds):
            yield (self, func, args, kwds)
        with woohoo(self=11, func=22, args=33, kwds=44) as target:
            self.assertEqual(target, (11, 22, 33, 44))

def test_nokeepref(self):
        class A:
            pass

@contextmanager
        def woohoo(a, b):
            a = weakref.ref(a)
            b = weakref.ref(b)
            # Allow test to work with a non-refcounted GC
            support.gc_collect()
            self.assertIsNone(a())
            self.assertIsNone(b())
            yield

with woohoo(A(), b=A()):
            pass

def test_param_errors(self):
        @contextmanager
        def woohoo(a, *, b):
            yield

with self.assertRaises(TypeError):
            woohoo()
        with self.assertRaises(TypeError):
            woohoo(3, 5)
        with self.assertRaises(TypeError):
            woohoo(b=3)

def test_recursive(self):
        depth = 0
        ncols = 0
        @contextmanager
        def woohoo():
            nonlocal ncols
            ncols += 1
            nonlocal depth
            before = depth
            depth += 1
            yield
            depth -= 1
            self.assertEqual(depth, before)

@woohoo()
        def recursive():
            if depth < 10:
                recursive()

recursive()
        self.assertEqual(ncols, 10)
        self.assertEqual(depth, 0)

class ClosingTestCase(unittest.TestCase):

@support.requires_docstrings
    def test_instance_docs(self):
        # Issue 19330: ensure context manager instances have good docstrings
        cm_docstring = closing.__doc__
        obj = closing(None)
        self.assertEqual(obj.__doc__, cm_docstring)

def test_closing(self):
        state = []
        class C:
            def close(self):
                state.append(1)
        x = C()
        self.assertEqual(state, [])
        with closing(x) as y:
            self.assertEqual(x, y)
        self.assertEqual(state, [1])

def test_closing_error(self):
        state = []
        class C:
            def close(self):
                state.append(1)
        x = C()
        self.assertEqual(state, [])
        with self.assertRaises(ZeroDivisionError):
            with closing(x) as y:
                self.assertEqual(x, y)
                1 / 0
        self.assertEqual(state, [1])

class NullcontextTestCase(unittest.TestCase):
    def test_nullcontext(self):
        class C:
            pass
        c = C()
        with nullcontext(c) as c_in:
            self.assertIs(c_in, c)

class FileContextTestCase(unittest.TestCase):

def testWithOpen(self):
        tfn = tempfile.mktemp()
        try:
            f = None
            with open(tfn, "w", encoding="utf-8") as f:
                self.assertFalse(f.closed)
                f.write("Booh\n")
            self.assertTrue(f.closed)
            f = None
            with self.assertRaises(ZeroDivisionError):
                with open(tfn, "r", encoding="utf-8") as f:
                    self.assertFalse(f.closed)
                    self.assertEqual(f.read(), "Booh\n")
                    1 / 0
            self.assertTrue(f.closed)
        finally:
            os_helper.unlink(tfn)

class LockContextTestCase(unittest.TestCase):

def boilerPlate(self, lock, locked):
        self.assertFalse(locked())
        with lock:
            self.assertTrue(locked())
        self.assertFalse(locked())
        with self.assertRaises(ZeroDivisionError):
            with lock:
                self.assertTrue(locked())
                1 / 0
        self.assertFalse(locked())

def testWithLock(self):
        lock = threading.Lock()
        self.boilerPlate(lock, lock.locked)

def testWithRLock(self):
        lock = threading.RLock()
        self.boilerPlate(lock, lock._is_owned)

def testWithCondition(self):
        lock = threading.Condition()
        def locked():
            return lock._is_owned()
        self.boilerPlate(lock, locked)

def testWithSemaphore(self):
        lock = threading.Semaphore()
        def locked():
            if lock.acquire(False):
                lock.release()
                return False
            else:
                return True
        self.boilerPlate(lock, locked)

def testWithBoundedSemaphore(self):
        lock = threading.BoundedSemaphore()
        def locked():
            if lock.acquire(False):
                lock.release()
                return False
            else:
                return True
        self.boilerPlate(lock, locked)

class mycontext(ContextDecorator):
    """Example decoration-compatible context manager for testing"""
    started = False
    exc = None
    catch = False

def __enter__(self):
        self.started = True
        return self

def __exit__(self, *exc):
        self.exc = exc
        return self.catch

class TestContextDecorator(unittest.TestCase):

@support.requires_docstrings
    def test_instance_docs(self):
        # Issue 19330: ensure context manager instances have good docstrings
        cm_docstring = mycontext.__doc__
        obj = mycontext()
        self.assertEqual(obj.__doc__, cm_docstring)

def test_contextdecorator(self):
        context = mycontext()
        with context as result:
            self.assertIs(result, context)
            self.assertTrue(context.started)

self.assertEqual(context.exc, (None, None, None))

def test_contextdecorator_with_exception(self):
        context = mycontext()

with self.assertRaisesRegex(NameError, 'foo'):
            with context:
                raise NameError('foo')
        self.assertIsNotNone(context.exc)
        self.assertIs(context.exc[0], NameError)

context = mycontext()
        context.catch = True
        with context:
            raise NameError('foo')
        self.assertIsNotNone(context.exc)
        self.assertIs(context.exc[0], NameError)

def test_decorator(self):
        context = mycontext()

@context
        def test():
            self.assertIsNone(context.exc)
            self.assertTrue(context.started)
        test()
        self.assertEqual(context.exc, (None, None, None))

def test_decorator_with_exception(self):
        context = mycontext()

@context
        def test():
            self.assertIsNone(context.exc)
            self.assertTrue(context.started)
            raise NameError('foo')

with self.assertRaisesRegex(NameError, 'foo'):
            test()
        self.assertIsNotNone(context.exc)
        self.assertIs(context.exc[0], NameError)

def test_decorating_method(self):
        context = mycontext()

class Test(object):

@context
            def method(self, a, b, c=None):
                self.a = a
                self.b = b
                self.c = c

# these tests are for argument passing when used as a decorator
        test = Test()
        test.method(1, 2)
        self.assertEqual(test.a, 1)
        self.assertEqual(test.b, 2)
        self.assertEqual(test.c, None)

test = Test()
        test.method('a', 'b', 'c')
        self.assertEqual(test.a, 'a')
        self.assertEqual(test.b, 'b')
        self.assertEqual(test.c, 'c')

test = Test()
        test.method(a=1, b=2)
        self.assertEqual(test.a, 1)
        self.assertEqual(test.b, 2)

def test_typo_enter(self):
        class mycontext(ContextDecorator):
            def __unter__(self):
                pass
            def __exit__(self, *exc):
                pass

with self.assertRaisesRegex(TypeError, 'the context manager'):
            with mycontext():
                pass

def test_typo_exit(self):
        class mycontext(ContextDecorator):
            def __enter__(self):
                pass
            def __uxit__(self, *exc):
                pass

with self.assertRaisesRegex(TypeError, 'the context manager.*__exit__'):
            with mycontext():
                pass

def test_contextdecorator_as_mixin(self):
        class somecontext(object):
            started = False
            exc = None

def __enter__(self):
                self.started = True
                return self

def __exit__(self, *exc):
                self.exc = exc

class mycontext(somecontext, ContextDecorator):
            pass

context = mycontext()
        @context
        def test():
            self.assertIsNone(context.exc)
            self.assertTrue(context.started)
        test()
        self.assertEqual(context.exc, (None, None, None))

def test_contextmanager_as_decorator(self):
        @contextmanager
        def woohoo(y):
            state.append(y)
            yield
            state.append(999)

state = []
        @woohoo(1)
        def test(x):
            self.assertEqual(state, [1])
            state.append(x)
        test('something')
        self.assertEqual(state, [1, 'something', 999])

# Issue #11647: Ensure the decorated function is 'reusable'
        state = []
        test('something else')
        self.assertEqual(state, [1, 'something else', 999])

class TestBaseExitStack:
    exit_stack = None

@support.requires_docstrings
    def test_instance_docs(self):
        # Issue 19330: ensure context manager instances have good docstrings
        cm_docstring = self.exit_stack.__doc__
        obj = self.exit_stack()
        self.assertEqual(obj.__doc__, cm_docstring)

def test_no_resources(self):
        with self.exit_stack():
            pass

def test_callback(self):
        expected = [
            ((), {}),
            ((1,), {}),
            ((1,2), {}),
            ((), dict(example=1)),
            ((1,), dict(example=1)),
            ((1,2), dict(example=1)),
            ((1,2), dict(self=3, callback=4)),
        ]
        result = []
        def _exit(*args, **kwds):
            """Test metadata propagation"""
            result.append((args, kwds))
        with self.exit_stack() as stack:
            for args, kwds in reversed(expected):
                if args and kwds:
                    f = stack.callback(_exit, *args, **kwds)
                elif args:
                    f = stack.callback(_exit, *args)
                elif kwds:
                    f = stack.callback(_exit, **kwds)
                else:
                    f = stack.callback(_exit)
                self.assertIs(f, _exit)
            for wrapper in stack._exit_callbacks:
                self.assertIs(wrapper[1].__wrapped__, _exit)
                self.assertNotEqual(wrapper[1].__name__, _exit.__name__)
                self.assertIsNone(wrapper[1].__doc__, _exit.__doc__)
        self.assertEqual(result, expected)

result = []
        with self.exit_stack() as stack:
            with self.assertRaises(TypeError):
                stack.callback(arg=1)
            with self.assertRaises(TypeError):
                self.exit_stack.callback(arg=2)
            with self.assertRaises(TypeError):
                stack.callback(callback=_exit, arg=3)
        self.assertEqual(result, [])

def test_push(self):
        exc_raised = ZeroDivisionError
        def _expect_exc(exc_type, exc, exc_tb):
            self.assertIs(exc_type, exc_raised)
        def _suppress_exc(*exc_details):
            return True
        def _expect_ok(exc_type, exc, exc_tb):
            self.assertIsNone(exc_type)
            self.assertIsNone(exc)
            self.assertIsNone(exc_tb)
        class ExitCM(object):
            def __init__(self, check_exc):
                self.check_exc = check_exc
            def __enter__(self):
                self.fail("Should not be called!")
            def __exit__(self, *exc_details):
                self.check_exc(*exc_details)
        with self.exit_stack() as stack:
            stack.push(_expect_ok)
            self.assertIs(stack._exit_callbacks[-1][1], _expect_ok)
            cm = ExitCM(_expect_ok)
            stack.push(cm)
            self.assertIs(stack._exit_callbacks[-1][1].__self__, cm)
            stack.push(_suppress_exc)
            self.assertIs(stack._exit_callbacks[-1][1], _suppress_exc)
            cm = ExitCM(_expect_exc)
            stack.push(cm)
            self.assertIs(stack._exit_callbacks[-1][1].__self__, cm)
            stack.push(_expect_exc)
            self.assertIs(stack._exit_callbacks[-1][1], _expect_exc)
            stack.push(_expect_exc)
            self.assertIs(stack._exit_callbacks[-1][1], _expect_exc)
            1/0

def test_enter_context(self):
        class TestCM(object):
            def __enter__(self):
                result.append(1)
            def __exit__(self, *exc_details):
                result.append(3)

result = []
        cm = TestCM()
        with self.exit_stack() as stack:
            @stack.callback  # Registered first => cleaned up last
            def _exit():
                result.append(4)
            self.assertIsNotNone(_exit)
            stack.enter_context(cm)
            self.assertIs(stack._exit_callbacks[-1][1].__self__, cm)
            result.append(2)
        self.assertEqual(result, [1, 2, 3, 4])

def test_enter_context_errors(self):
        class LacksEnterAndExit:
            pass
        class LacksEnter:
            def __exit__(self, *exc_info):
                pass
        class LacksExit:
            def __enter__(self):
                pass

with self.exit_stack() as stack:
            with self.assertRaisesRegex(TypeError, 'the context manager'):
                stack.enter_context(LacksEnterAndExit())
            with self.assertRaisesRegex(TypeError, 'the context manager'):
                stack.enter_context(LacksEnter())
            with self.assertRaisesRegex(TypeError, 'the context manager'):
                stack.enter_context(LacksExit())
            self.assertFalse(stack._exit_callbacks)

def test_close(self):
        result = []
        with self.exit_stack() as stack:
            @stack.callback
            def _exit():
                result.append(1)
            self.assertIsNotNone(_exit)
            stack.close()
            result.append(2)
        self.assertEqual(result, [1, 2])

def test_pop_all(self):
        result = []
        with self.exit_stack() as stack:
            @stack.callback
            def _exit():
                result.append(3)
            self.assertIsNotNone(_exit)
            new_stack = stack.pop_all()
            result.append(1)
        result.append(2)
        new_stack.close()
        self.assertEqual(result, [1, 2, 3])

def test_exit_raise(self):
        with self.assertRaises(ZeroDivisionError):
            with self.exit_stack() as stack:
                stack.push(lambda *exc: False)
                1/0

def test_exit_suppress(self):
        with self.exit_stack() as stack:
            stack.push(lambda *exc: True)
            1/0

def test_exit_exception_traceback(self):
        # This test captures the current behavior of ExitStack so that we know
        # if we ever unintendedly change it. It is not a statement of what the
        # desired behavior is (for instance, we may want to remove some of the
        # internal contextlib frames).

def raise_exc(exc):
            raise exc

try:
            with self.exit_stack() as stack:
                stack.callback(raise_exc, ValueError)
                1/0
        except ValueError as e:
            exc = e

self.assertIsInstance(exc, ValueError)
        ve_frames = traceback.extract_tb(exc.__traceback__)
        expected = \
            [('test_exit_exception_traceback', 'with self.exit_stack() as stack:')] + \
            self.callback_error_internal_frames + \
            [('_exit_wrapper', 'callback(*args, **kwds)'),
             ('raise_exc', 'raise exc')]

self.assertEqual(
            [(f.name, f.line) for f in ve_frames], expected)

self.assertIsInstance(exc.__context__, ZeroDivisionError)
        zde_frames = traceback.extract_tb(exc.__context__.__traceback__)
        self.assertEqual([(f.name, f.line) for f in zde_frames],
                         [('test_exit_exception_traceback', '1/0')])

def test_exit_exception_chaining_reference(self):
        # Sanity check to make sure that ExitStack chaining matches
        # actual nested with statements
        class RaiseExc:
            def __init__(self, exc):
                self.exc = exc
            def __enter__(self):
                return self
            def __exit__(self, *exc_details):
                raise self.exc

class RaiseExcWithContext:
            def __init__(self, outer, inner):
                self.outer = outer
                self.inner = inner
            def __enter__(self):
                return self
            def __exit__(self, *exc_details):
                try:
                    raise self.inner
                except:
                    raise self.outer

class SuppressExc:
            def __enter__(self):
                return self
            def __exit__(self, *exc_details):
                type(self).saved_details = exc_details
                return True

try:
            with RaiseExc(IndexError):
                with RaiseExcWithContext(KeyError, AttributeError):
                    with SuppressExc():
                        with RaiseExc(ValueError):
                            1 / 0
        except IndexError as exc:
            self.assertIsInstance(exc.__context__, KeyError)
            self.assertIsInstance(exc.__context__.__context__, AttributeError)
            # Inner exceptions were suppressed
            self.assertIsNone(exc.__context__.__context__.__context__)
        else:
            self.fail("Expected IndexError, but no exception was raised")
        # Check the inner exceptions
        inner_exc = SuppressExc.saved_details[1]
        self.assertIsInstance(inner_exc, ValueError)
        self.assertIsInstance(inner_exc.__context__, ZeroDivisionError)

def test_exit_exception_chaining(self):
        # Ensure exception chaining matches the reference behaviour
        def raise_exc(exc):
            raise exc

saved_details = None
        def suppress_exc(*exc_details):
            nonlocal saved_details
            saved_details = exc_details
            return True

try:
            with self.exit_stack() as stack:
                stack.callback(raise_exc, IndexError)
                stack.callback(raise_exc, KeyError)
                stack.callback(raise_exc, AttributeError)
                stack.push(suppress_exc)
                stack.callback(raise_exc, ValueError)
                1 / 0
        except IndexError as exc:
            self.assertIsInstance(exc.__context__, KeyError)
            self.assertIsInstance(exc.__context__.__context__, AttributeError)
            # Inner exceptions were suppressed
            self.assertIsNone(exc.__context__.__context__.__context__)
        else:
            self.fail("Expected IndexError, but no exception was raised")
        # Check the inner exceptions
        inner_exc = saved_details[1]
        self.assertIsInstance(inner_exc, ValueError)
        self.assertIsInstance(inner_exc.__context__, ZeroDivisionError)

def test_exit_exception_explicit_none_context(self):
        # Ensure ExitStack chaining matches actual nested `with` statements
        # regarding explicit __context__ = None.

class MyException(Exception):
            pass

@contextmanager
        def my_cm():
            try:
                yield
            except BaseException:
                exc = MyException()
                try:
                    raise exc
                finally:
                    exc.__context__ = None

@contextmanager
        def my_cm_with_exit_stack():
            with self.exit_stack() as stack:
                stack.enter_context(my_cm())
                yield stack

for cm in (my_cm, my_cm_with_exit_stack):
            with self.subTest():
                try:
                    with cm():
                        raise IndexError()
                except MyException as exc:
                    self.assertIsNone(exc.__context__)
                else:
                    self.fail("Expected IndexError, but no exception was raised")

def test_exit_exception_non_suppressing(self):
        # http://bugs.python.org/issue19092
        def raise_exc(exc):
            raise exc

def suppress_exc(*exc_details):
            return True

try:
            with self.exit_stack() as stack:
                stack.callback(lambda: None)
                stack.callback(raise_exc, IndexError)
        except Exception as exc:
            self.assertIsInstance(exc, IndexError)
        else:
            self.fail("Expected IndexError, but no exception was raised")

try:
            with self.exit_stack() as stack:
                stack.callback(raise_exc, KeyError)
                stack.push(suppress_exc)
                stack.callback(raise_exc, IndexError)
        except Exception as exc:
            self.assertIsInstance(exc, KeyError)
        else:
            self.fail("Expected KeyError, but no exception was raised")

def test_exit_exception_with_correct_context(self):
        # http://bugs.python.org/issue20317
        @contextmanager
        def gets_the_context_right(exc):
            try:
                yield
            finally:
                raise exc

exc1 = Exception(1)
        exc2 = Exception(2)
        exc3 = Exception(3)
        exc4 = Exception(4)

# The contextmanager already fixes the context, so prior to the
        # fix, ExitStack would try to fix it *again* and get into an
        # infinite self-referential loop
        try:
            with self.exit_stack() as stack:
                stack.enter_context(gets_the_context_right(exc4))
                stack.enter_context(gets_the_context_right(exc3))
                stack.enter_context(gets_the_context_right(exc2))
                raise exc1
        except Exception as exc:
            self.assertIs(exc, exc4)
            self.assertIs(exc.__context__, exc3)
            self.assertIs(exc.__context__.__context__, exc2)
            self.assertIs(exc.__context__.__context__.__context__, exc1)
            self.assertIsNone(
                       exc.__context__.__context__.__context__.__context__)

def test_exit_exception_with_existing_context(self):
        # Addresses a lack of test coverage discovered after checking in a
        # fix for issue 20317 that still contained debugging code.
        def raise_nested(inner_exc, outer_exc):
            try:
                raise inner_exc
            finally:
                raise outer_exc
        exc1 = Exception(1)
        exc2 = Exception(2)
        exc3 = Exception(3)
        exc4 = Exception(4)
        exc5 = Exception(5)
        try:
            with self.exit_stack() as stack:
                stack.callback(raise_nested, exc4, exc5)
                stack.callback(raise_nested, exc2, exc3)
                raise exc1
        except Exception as exc:
            self.assertIs(exc, exc5)
            self.assertIs(exc.__context__, exc4)
            self.assertIs(exc.__context__.__context__, exc3)
            self.assertIs(exc.__context__.__context__.__context__, exc2)
            self.assertIs(
                 exc.__context__.__context__.__context__.__context__, exc1)
            self.assertIsNone(
                exc.__context__.__context__.__context__.__context__.__context__)

def test_body_exception_suppress(self):
        def suppress_exc(*exc_details):
            return True
        try:
            with self.exit_stack() as stack:
                stack.push(suppress_exc)
                1/0
        except IndexError as exc:
            self.fail("Expected no exception, got IndexError")

def test_exit_exception_chaining_suppress(self):
        with self.exit_stack() as stack:
            stack.push(lambda *exc: True)
            stack.push(lambda *exc: 1/0)
            stack.push(lambda *exc: {}[1])

def test_excessive_nesting(self):
        # The original implementation would die with RecursionError here
        with self.exit_stack() as stack:
            for i in range(10000):
                stack.callback(int)

def test_instance_bypass(self):
        class Example(object): pass
        cm = Example()
        cm.__enter__ = object()
        cm.__exit__ = object()
        stack = self.exit_stack()
        with self.assertRaisesRegex(TypeError, 'the context manager'):
            stack.enter_context(cm)
        stack.push(cm)
        self.assertIs(stack._exit_callbacks[-1][1], cm)

def test_dont_reraise_RuntimeError(self):
        # https://bugs.python.org/issue27122
        class UniqueException(Exception): pass
        class UniqueRuntimeError(RuntimeError): pass

@contextmanager
        def second():
            try:
                yield 1
            except Exception as exc:
                raise UniqueException("new exception") from exc

@contextmanager
        def first():
            try:
                yield 1
            except Exception as exc:
                raise exc

# The UniqueRuntimeError should be caught by second()'s exception
        # handler which chain raised a new UniqueException.
        with self.assertRaises(UniqueException) as err_ctx:
            with self.exit_stack() as es_ctx:
                es_ctx.enter_context(second())
                es_ctx.enter_context(first())
                raise UniqueRuntimeError("please no infinite loop.")

exc = err_ctx.exception
        self.assertIsInstance(exc, UniqueException)
        self.assertIsInstance(exc.__context__, UniqueRuntimeError)
        self.assertIsNone(exc.__context__.__context__)
        self.assertIsNone(exc.__context__.__cause__)
        self.assertIs(exc.__cause__, exc.__context__)

class TestExitStack(TestBaseExitStack, unittest.TestCase):
    exit_stack = ExitStack
    callback_error_internal_frames = [
        ('__exit__', 'raise exc_details[1]'),
        ('__exit__', 'if cb(*exc_details):'),
    ]

class TestRedirectStream:

redirect_stream = None
    orig_stream = None

@support.requires_docstrings
    def test_instance_docs(self):
        # Issue 19330: ensure context manager instances have good docstrings
        cm_docstring = self.redirect_stream.__doc__
        obj = self.redirect_stream(None)
        self.assertEqual(obj.__doc__, cm_docstring)

def test_no_redirect_in_init(self):
        orig_stdout = getattr(sys, self.orig_stream)
        self.redirect_stream(None)
        self.assertIs(getattr(sys, self.orig_stream), orig_stdout)

def test_redirect_to_string_io(self):
        f = io.StringIO()
        msg = "Consider an API like help(), which prints directly to stdout"
        orig_stdout = getattr(sys, self.orig_stream)
        with self.redirect_stream(f):
            print(msg, file=getattr(sys, self.orig_stream))
        self.assertIs(getattr(sys, self.orig_stream), orig_stdout)
        s = f.getvalue().strip()
        self.assertEqual(s, msg)

def test_enter_result_is_target(self):
        f = io.StringIO()
        with self.redirect_stream(f) as enter_result:
            self.assertIs(enter_result, f)

def test_cm_is_reusable(self):
        f = io.StringIO()
        write_to_f = self.redirect_stream(f)
        orig_stdout = getattr(sys, self.orig_stream)
        with write_to_f:
            print("Hello", end=" ", file=getattr(sys, self.orig_stream))
        with write_to_f:
            print("World!", file=getattr(sys, self.orig_stream))
        self.assertIs(getattr(sys, self.orig_stream), orig_stdout)
        s = f.getvalue()
        self.assertEqual(s, "Hello World!\n")

def test_cm_is_reentrant(self):
        f = io.StringIO()
        write_to_f = self.redirect_stream(f)
        orig_stdout = getattr(sys, self.orig_stream)
        with write_to_f:
            print("Hello", end=" ", file=getattr(sys, self.orig_stream))
            with write_to_f:
                print("World!", file=getattr(sys, self.orig_stream))
        self.assertIs(getattr(sys, self.orig_stream), orig_stdout)
        s = f.getvalue()
        self.assertEqual(s, "Hello World!\n")

class TestRedirectStdout(TestRedirectStream, unittest.TestCase):

redirect_stream = redirect_stdout
    orig_stream = "stdout"

class TestRedirectStderr(TestRedirectStream, unittest.TestCase):

redirect_stream = redirect_stderr
    orig_stream = "stderr"

class TestSuppress(ExceptionIsLikeMixin, unittest.TestCase):

@support.requires_docstrings
    def test_instance_docs(self):
        # Issue 19330: ensure context manager instances have good docstrings
        cm_docstring = suppress.__doc__
        obj = suppress()
        self.assertEqual(obj.__doc__, cm_docstring)

def test_no_result_from_enter(self):
        with suppress(ValueError) as enter_result:
            self.assertIsNone(enter_result)

def test_no_exception(self):
        with suppress(ValueError):
            self.assertEqual(pow(2, 5), 32)

def test_exact_exception(self):
        with suppress(TypeError):
            len(5)

def test_exception_hierarchy(self):
        with suppress(LookupError):
            'Hello'[50]

def test_other_exception(self):
        with self.assertRaises(ZeroDivisionError):
            with suppress(TypeError):
                1/0

def test_no_args(self):
        with self.assertRaises(ZeroDivisionError):
            with suppress():
                1/0

def test_multiple_exception_args(self):
        with suppress(ZeroDivisionError, TypeError):
            1/0
        with suppress(ZeroDivisionError, TypeError):
            len(5)

def test_cm_is_reentrant(self):
        ignore_exceptions = suppress(Exception)
        with ignore_exceptions:
            pass
        with ignore_exceptions:
            len(5)
        with ignore_exceptions:
            with ignore_exceptions: # Check nested usage
                len(5)
            outer_continued = True
            1/0
        self.assertTrue(outer_continued)

def test_exception_groups(self):
        eg_ve = lambda: ExceptionGroup(
            "EG with ValueErrors only",
            [ValueError("ve1"), ValueError("ve2"), ValueError("ve3")],
        )
        eg_all = lambda: ExceptionGroup(
            "EG with many types of exceptions",
            [ValueError("ve1"), KeyError("ke1"), ValueError("ve2"), KeyError("ke2")],
        )
        with suppress(ValueError):
            raise eg_ve()
        with suppress(ValueError, KeyError):
            raise eg_all()
        with self.assertRaises(ExceptionGroup) as eg1:
            with suppress(ValueError):
                raise eg_all()
        self.assertExceptionIsLike(
            eg1.exception,
            ExceptionGroup(
                "EG with many types of exceptions",
                [KeyError("ke1"), KeyError("ke2")],
            ),
        )
        # Check handling of BaseExceptionGroup, using GeneratorExit so that
        # we don't accidentally discard a ctrl-c with KeyboardInterrupt.
        with suppress(GeneratorExit):
            raise BaseExceptionGroup("message", [GeneratorExit()])
        # If we raise a BaseException group, we can still suppress parts
        with self.assertRaises(BaseExceptionGroup) as eg1:
            with suppress(KeyError):
                raise BaseExceptionGroup("message", [GeneratorExit("g"), KeyError("k")])
        self.assertExceptionIsLike(
            eg1.exception, BaseExceptionGroup("message", [GeneratorExit("g")]),
        )
        # If we suppress all the leaf BaseExceptions, we get a non-base ExceptionGroup
        with self.assertRaises(ExceptionGroup) as eg1:
            with suppress(GeneratorExit):
                raise BaseExceptionGroup("message", [GeneratorExit("g"), KeyError("k")])
        self.assertExceptionIsLike(
            eg1.exception, ExceptionGroup("message", [KeyError("k")]),
        )

class TestChdir(unittest.TestCase):
    def make_relative_path(self, *parts):
        return os.path.join(
            os.path.dirname(os.path.realpath(__file__)),
            *parts,
        )

def test_simple(self):
        old_cwd = os.getcwd()
        target = self.make_relative_path('data')
        self.assertNotEqual(old_cwd, target)

with chdir(target):
            self.assertEqual(os.getcwd(), target)
        self.assertEqual(os.getcwd(), old_cwd)

def test_reentrant(self):
        old_cwd = os.getcwd()
        target1 = self.make_relative_path('data')
        target2 = self.make_relative_path('ziptestdata')
        self.assertNotIn(old_cwd, (target1, target2))
        chdir1, chdir2 = chdir(target1), chdir(target2)

with chdir1:
            self.assertEqual(os.getcwd(), target1)
            with chdir2:
                self.assertEqual(os.getcwd(), target2)
                with chdir1:
                    self.assertEqual(os.getcwd(), target1)
                self.assertEqual(os.getcwd(), target2)
            self.assertEqual(os.getcwd(), target1)
        self.assertEqual(os.getcwd(), old_cwd)

def test_exception(self):
        old_cwd = os.getcwd()
        target = self.make_relative_path('data')
        self.assertNotEqual(old_cwd, target)

try:
            with chdir(target):
                self.assertEqual(os.getcwd(), target)
                raise RuntimeError("boom")
        except RuntimeError as re:
            self.assertEqual(str(re), "boom")
        self.assertEqual(os.getcwd(), old_cwd)

if __name__ == "__main__":
    unittest.main()

${this.title}

Code Editor : test_contextlib.py