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Name	Size	Permission
__pycache__	[ DIR ]	drwxrwxrwx
audiodata	[ DIR ]	drwxrwxrwx
capath	[ DIR ]	drwxrwxrwx
cjkencodings	[ DIR ]	drwxrwxrwx
crashers	[ DIR ]	drwxrwxrwx
data	[ DIR ]	drwxrwxrwx
decimaltestdata	[ DIR ]	drwxrwxrwx
dtracedata	[ DIR ]	drwxrwxrwx
encoded_modules	[ DIR ]	drwxrwxrwx
imghdrdata	[ DIR ]	drwxrwxrwx
leakers	[ DIR ]	drwxrwxrwx
libregrtest	[ DIR ]	drwxrwxrwx
sndhdrdata	[ DIR ]	drwxrwxrwx
subprocessdata	[ DIR ]	drwxrwxrwx
support	[ DIR ]	drwxrwxrwx
test_asyncio	[ DIR ]	drwxrwxrwx
test_email	[ DIR ]	drwxrwxrwx
test_import	[ DIR ]	drwxrwxrwx
test_importlib	[ DIR ]	drwxrwxrwx
test_json	[ DIR ]	drwxrwxrwx
test_peg_generator	[ DIR ]	drwxrwxrwx
test_tools	[ DIR ]	drwxrwxrwx
test_warnings	[ DIR ]	drwxrwxrwx
test_zoneinfo	[ DIR ]	drwxrwxrwx
tracedmodules	[ DIR ]	drwxrwxrwx
xmltestdata	[ DIR ]	drwxrwxrwx
ziptestdata	[ DIR ]	drwxrwxrwx
Sine-1000Hz-300ms.aif	60.25 KB	-rw-rw-rw-
__init__.py	48 B	-rw-rw-rw-
__main__.py	43 B	-rw-rw-rw-
_test_atexit.py	3.75 KB	-rw-rw-rw-
_test_eintr.py	18.17 KB	-rw-rw-rw-
_test_embed_set_config.py	8.81 KB	-rw-rw-rw-
_test_multiprocessing.py	199.1 KB	-rw-rw-rw-
_typed_dict_helper.py	512 B	-rw-rw-rw-
allsans.pem	10.03 KB	-rw-rw-rw-
ann_module.py	1.15 KB	-rw-rw-rw-
ann_module2.py	555 B	-rw-rw-rw-
ann_module3.py	466 B	-rw-rw-rw-
ann_module4.py	86 B	-rw-rw-rw-
ann_module5.py	212 B	-rw-rw-rw-
ann_module6.py	145 B	-rw-rw-rw-
ann_module7.py	306 B	-rw-rw-rw-
audiotest.au	27.48 KB	-rw-rw-rw-
audiotests.py	12.46 KB	-rw-rw-rw-
audit-tests.py	11.09 KB	-rw-rw-rw-
autotest.py	214 B	-rw-rw-rw-
bad_coding.py	25 B	-rw-rw-rw-
bad_coding2.py	32 B	-rw-rw-rw-
bad_getattr.py	65 B	-rw-rw-rw-
bad_getattr2.py	84 B	-rw-rw-rw-
bad_getattr3.py	144 B	-rw-rw-rw-
badcert.pem	1.92 KB	-rw-rw-rw-
badkey.pem	2.15 KB	-rw-rw-rw-
badsyntax_3131.py	34 B	-rw-rw-rw-
badsyntax_future10.py	98 B	-rw-rw-rw-
badsyntax_future3.py	182 B	-rw-rw-rw-
badsyntax_future4.py	163 B	-rw-rw-rw-
badsyntax_future5.py	196 B	-rw-rw-rw-
badsyntax_future6.py	171 B	-rw-rw-rw-
badsyntax_future7.py	207 B	-rw-rw-rw-
badsyntax_future8.py	132 B	-rw-rw-rw-
badsyntax_future9.py	152 B	-rw-rw-rw-
badsyntax_pep3120.py	15 B	-rw-rw-rw-
bisect_cmd.py	5.39 KB	-rw-rw-rw-
cfgparser.1	70 B	-rw-rw-rw-
cfgparser.2	19.54 KB	-rw-rw-rw-
cfgparser.3	1.62 KB	-rw-rw-rw-
clinic.test	97.34 KB	-rw-rw-rw-
cmath_testcases.txt	143.5 KB	-rw-rw-rw-
coding20731.py	22 B	-rw-rw-rw-
curses_tests.py	1.26 KB	-rw-rw-rw-
dataclass_module_1.py	869 B	-rw-rw-rw-
dataclass_module_1_str.py	867 B	-rw-rw-rw-
dataclass_module_2.py	788 B	-rw-rw-rw-
dataclass_module_2_str.py	786 B	-rw-rw-rw-
dataclass_textanno.py	138 B	-rw-rw-rw-
datetimetester.py	251.38 KB	-rw-rw-rw-
dis_module.py	81 B	-rw-rw-rw-
doctest_aliases.py	253 B	-rw-rw-rw-
doctest_lineno.py	964 B	-rw-rw-rw-
double_const.py	1.21 KB	-rw-rw-rw-
empty.vbs	70 B	-rw-rw-rw-
exception_hierarchy.txt	1.87 KB	-rw-rw-rw-
ffdh3072.pem	2.2 KB	-rw-rw-rw-
final_a.py	430 B	-rw-rw-rw-
final_b.py	430 B	-rw-rw-rw-
floating_points.txt	16.92 KB	-rw-rw-rw-
fork_wait.py	2.31 KB	-rw-rw-rw-
formatfloat_testcases.txt	7.8 KB	-rw-rw-rw-
future_test1.py	240 B	-rw-rw-rw-
future_test2.py	159 B	-rw-rw-rw-
gdb_sample.py	165 B	-rw-rw-rw-
good_getattr.py	209 B	-rw-rw-rw-
idnsans.pem	9.88 KB	-rw-rw-rw-
ieee754.txt	3.39 KB	-rw-rw-rw-
imp_dummy.py	66 B	-rw-rw-rw-
inspect_fodder.py	1.99 KB	-rw-rw-rw-
inspect_fodder2.py	3.64 KB	-rw-rw-rw-
inspect_stock_annotations.py	537 B	-rw-rw-rw-
inspect_stringized_annotations...	646 B	-rw-rw-rw-
inspect_stringized_annotations...	63 B	-rw-rw-rw-
keycert.passwd.pem	4.19 KB	-rw-rw-rw-
keycert.pem	4.03 KB	-rw-rw-rw-
keycert2.pem	4.05 KB	-rw-rw-rw-
keycert3.pem	9.39 KB	-rw-rw-rw-
keycert4.pem	9.4 KB	-rw-rw-rw-
keycertecc.pem	5.61 KB	-rw-rw-rw-
list_tests.py	17.2 KB	-rw-rw-rw-
lock_tests.py	31.14 KB	-rw-rw-rw-
mailcap.txt	1.28 KB	-rw-rw-rw-
make_ssl_certs.py	9.55 KB	-rw-rw-rw-
mapping_tests.py	22.49 KB	-rw-rw-rw-
math_testcases.txt	23.8 KB	-rw-rw-rw-
memory_watchdog.py	887 B	-rw-rw-rw-
mime.types	48.78 KB	-rw-rw-rw-
mock_socket.py	3.86 KB	-rw-rw-rw-
mod_generics_cache.py	1.18 KB	-rw-rw-rw-
mp_fork_bomb.py	466 B	-rw-rw-rw-
mp_preload.py	369 B	-rw-rw-rw-
multibytecodec_support.py	14.56 KB	-rw-rw-rw-
nokia.pem	1.91 KB	-rw-rw-rw-
nosan.pem	7.67 KB	-rw-rw-rw-
nullbytecert.pem	5.4 KB	-rw-rw-rw-
nullcert.pem	0 B	-rw-rw-rw-
pickletester.py	142.98 KB	-rw-rw-rw-
profilee.py	3.08 KB	-rw-rw-rw-
pstats.pck	65.05 KB	-rw-rw-rw-
pycacert.pem	5.63 KB	-rw-rw-rw-
pycakey.pem	2.46 KB	-rw-rw-rw-
pyclbr_input.py	681 B	-rw-rw-rw-
pydoc_mod.py	1010 B	-rw-rw-rw-
pydocfodder.py	6.39 KB	-rw-rw-rw-
pythoninfo.py	24.41 KB	-rw-rw-rw-
randv2_32.pck	7.34 KB	-rw-rw-rw-
randv2_64.pck	7.19 KB	-rw-rw-rw-
randv3.pck	7.82 KB	-rw-rw-rw-
re_tests.py	26.48 KB	-rw-rw-rw-
recursion.tar	516 B	-rw-rw-rw-
regrtest.py	1.31 KB	-rw-rw-rw-
relimport.py	28 B	-rw-rw-rw-
reperf.py	561 B	-rw-rw-rw-
revocation.crl	814 B	-rw-rw-rw-
sample_doctest.py	1.09 KB	-rw-rw-rw-
sample_doctest_no_docstrings.p...	239 B	-rw-rw-rw-
sample_doctest_no_doctests.py	284 B	-rw-rw-rw-
secp384r1.pem	263 B	-rw-rw-rw-
selfsigned_pythontestdotnet.pe...	2.11 KB	-rw-rw-rw-
seq_tests.py	15.29 KB	-rw-rw-rw-
sgml_input.html	8.31 KB	-rw-rw-rw-
signalinterproctester.py	2.82 KB	-rw-rw-rw-
sortperf.py	4.86 KB	-rw-rw-rw-
ssl_cert.pem	1.56 KB	-rw-rw-rw-
ssl_key.passwd.pem	2.63 KB	-rw-rw-rw-
ssl_key.pem	2.47 KB	-rw-rw-rw-
ssl_servers.py	7.31 KB	-rw-rw-rw-
ssltests.py	1.06 KB	-rw-rw-rw-
string_tests.py	69.47 KB	-rw-rw-rw-
talos-2019-0758.pem	1.32 KB	-rw-rw-rw-
test___all__.py	4.66 KB	-rw-rw-rw-
test___future__.py	2.42 KB	-rw-rw-rw-
test__locale.py	8.02 KB	-rw-rw-rw-
test__opcode.py	3.11 KB	-rw-rw-rw-
test__osx_support.py	13.96 KB	-rw-rw-rw-
test__xxsubinterpreters.py	81.21 KB	-rw-rw-rw-
test_abc.py	23.85 KB	-rw-rw-rw-
test_abstract_numbers.py	1.54 KB	-rw-rw-rw-
test_aifc.py	18.2 KB	-rw-rw-rw-
test_argparse.py	185.85 KB	-rw-rw-rw-
test_array.py	56.79 KB	-rw-rw-rw-
test_asdl_parser.py	4.57 KB	-rw-rw-rw-
test_ast.py	107.34 KB	-rw-rw-rw-
test_asyncgen.py	48.43 KB	-rw-rw-rw-
test_asynchat.py	9.68 KB	-rw-rw-rw-
test_asyncore.py	26.95 KB	-rw-rw-rw-
test_atexit.py	3.25 KB	-rw-rw-rw-
test_audioop.py	28.79 KB	-rw-rw-rw-
test_audit.py	5.56 KB	-rw-rw-rw-
test_augassign.py	8 KB	-rw-rw-rw-
test_base64.py	35.28 KB	-rw-rw-rw-
test_baseexception.py	7.05 KB	-rw-rw-rw-
test_bdb.py	44.64 KB	-rw-rw-rw-
test_bigaddrspace.py	2.93 KB	-rw-rw-rw-
test_bigmem.py	46.01 KB	-rw-rw-rw-
test_binascii.py	19.72 KB	-rw-rw-rw-
test_binhex.py	2.17 KB	-rw-rw-rw-
test_binop.py	14.57 KB	-rw-rw-rw-
test_bisect.py	16.09 KB	-rw-rw-rw-
test_bool.py	12.89 KB	-rw-rw-rw-
test_buffer.py	164.64 KB	-rw-rw-rw-
test_bufio.py	2.65 KB	-rw-rw-rw-
test_builtin.py	87.93 KB	-rw-rw-rw-
test_bytes.py	78.01 KB	-rw-rw-rw-
test_bz2.py	38.22 KB	-rw-rw-rw-
test_c_locale_coercion.py	19.35 KB	-rw-rw-rw-
test_calendar.py	51.76 KB	-rw-rw-rw-
test_call.py	26.95 KB	-rw-rw-rw-
test_capi.py	41.78 KB	-rw-rw-rw-
test_cgi.py	22.89 KB	-rw-rw-rw-
test_cgitb.py	2.61 KB	-rw-rw-rw-
test_charmapcodec.py	1.83 KB	-rw-rw-rw-
test_check_c_globals.py	773 B	-rw-rw-rw-
test_class.py	18.07 KB	-rw-rw-rw-
test_clinic.py	22.35 KB	-rw-rw-rw-
test_cmath.py	24.71 KB	-rw-rw-rw-
test_cmd.py	6.34 KB	-rw-rw-rw-
test_cmd_line.py	36.79 KB	-rw-rw-rw-
test_cmd_line_script.py	33.44 KB	-rw-rw-rw-
test_code.py	13.11 KB	-rw-rw-rw-
test_code_module.py	5.69 KB	-rw-rw-rw-
test_codeccallbacks.py	48.64 KB	-rw-rw-rw-
test_codecencodings_cn.py	3.95 KB	-rw-rw-rw-
test_codecencodings_hk.py	723 B	-rw-rw-rw-
test_codecencodings_iso2022.py	1.4 KB	-rw-rw-rw-
test_codecencodings_jp.py	4.92 KB	-rw-rw-rw-
test_codecencodings_kr.py	3.02 KB	-rw-rw-rw-
test_codecencodings_tw.py	703 B	-rw-rw-rw-
test_codecmaps_cn.py	772 B	-rw-rw-rw-
test_codecmaps_hk.py	401 B	-rw-rw-rw-
test_codecmaps_jp.py	1.76 KB	-rw-rw-rw-
test_codecmaps_kr.py	1.2 KB	-rw-rw-rw-
test_codecmaps_tw.py	732 B	-rw-rw-rw-
test_codecs.py	136.49 KB	-rw-rw-rw-
test_codeop.py	8.65 KB	-rw-rw-rw-
test_collections.py	94.1 KB	-rw-rw-rw-
test_colorsys.py	3.93 KB	-rw-rw-rw-
test_compare.py	3.85 KB	-rw-rw-rw-
test_compile.py	45.9 KB	-rw-rw-rw-
test_compileall.py	47.1 KB	-rw-rw-rw-
test_complex.py	33.54 KB	-rw-rw-rw-
test_concurrent_futures.py	57.2 KB	-rw-rw-rw-
test_configparser.py	87.49 KB	-rw-rw-rw-
test_contains.py	3.46 KB	-rw-rw-rw-
test_context.py	31.7 KB	-rw-rw-rw-
test_contextlib.py	36.33 KB	-rw-rw-rw-
test_contextlib_async.py	19.36 KB	-rw-rw-rw-
test_copy.py	27.28 KB	-rw-rw-rw-
test_copyreg.py	4.52 KB	-rw-rw-rw-
test_coroutines.py	65.27 KB	-rw-rw-rw-
test_cprofile.py	6.45 KB	-rw-rw-rw-
test_crashers.py	1.21 KB	-rw-rw-rw-
test_crypt.py	4.25 KB	-rw-rw-rw-
test_csv.py	52.95 KB	-rw-rw-rw-
test_ctypes.py	209 B	-rw-rw-rw-
test_curses.py	47.87 KB	-rw-rw-rw-
test_dataclasses.py	129.65 KB	-rw-rw-rw-
test_datetime.py	2.37 KB	-rw-rw-rw-
test_dbm.py	6.3 KB	-rw-rw-rw-
test_dbm_dumb.py	10.97 KB	-rw-rw-rw-
test_dbm_gnu.py	6.68 KB	-rw-rw-rw-
test_dbm_ndbm.py	5.24 KB	-rw-rw-rw-
test_decimal.py	214.93 KB	-rw-rw-rw-
test_decorators.py	14.87 KB	-rw-rw-rw-
test_defaultdict.py	6.31 KB	-rw-rw-rw-
test_deque.py	34.67 KB	-rw-rw-rw-
test_descr.py	198.27 KB	-rw-rw-rw-
test_descrtut.py	12.03 KB	-rw-rw-rw-
test_devpoll.py	4.58 KB	-rw-rw-rw-
test_dict.py	52.3 KB	-rw-rw-rw-
test_dict_version.py	6.28 KB	-rw-rw-rw-
test_dictcomps.py	5.28 KB	-rw-rw-rw-
test_dictviews.py	13.81 KB	-rw-rw-rw-
test_difflib.py	22.02 KB	-rw-rw-rw-
test_difflib_expect.html	101.36 KB	-rw-rw-rw-
test_dis.py	57.74 KB	-rw-rw-rw-
test_distutils.py	615 B	-rw-rw-rw-
test_doctest.py	104.21 KB	-rw-rw-rw-
test_doctest.txt	317 B	-rw-rw-rw-
test_doctest2.py	2.48 KB	-rw-rw-rw-
test_doctest2.txt	406 B	-rw-rw-rw-
test_doctest3.txt	87 B	-rw-rw-rw-
test_doctest4.txt	255 B	-rw-rw-rw-
test_docxmlrpc.py	8.88 KB	-rw-rw-rw-
test_dtrace.py	5.31 KB	-rw-rw-rw-
test_dynamic.py	4.43 KB	-rw-rw-rw-
test_dynamicclassattribute.py	9.86 KB	-rw-rw-rw-
test_eintr.py	604 B	-rw-rw-rw-
test_embed.py	57.38 KB	-rw-rw-rw-
test_ensurepip.py	12.55 KB	-rw-rw-rw-
test_enum.py	124.47 KB	-rw-rw-rw-
test_enumerate.py	8.74 KB	-rw-rw-rw-
test_eof.py	3.1 KB	-rw-rw-rw-
test_epoll.py	9.39 KB	-rw-rw-rw-
test_errno.py	1.08 KB	-rw-rw-rw-
test_exception_hierarchy.py	7.63 KB	-rw-rw-rw-
test_exception_variations.py	4.03 KB	-rw-rw-rw-
test_exceptions.py	93.28 KB	-rw-rw-rw-
test_extcall.py	14.57 KB	-rw-rw-rw-
test_faulthandler.py	30.98 KB	-rw-rw-rw-
test_fcntl.py	7.64 KB	-rw-rw-rw-
test_file.py	12.12 KB	-rw-rw-rw-
test_file_eintr.py	10.86 KB	-rw-rw-rw-
test_filecmp.py	10.57 KB	-rw-rw-rw-
test_fileinput.py	40.5 KB	-rw-rw-rw-
test_fileio.py	20.53 KB	-rw-rw-rw-
test_finalization.py	15.18 KB	-rw-rw-rw-
test_float.py	67.75 KB	-rw-rw-rw-
test_flufl.py	1.59 KB	-rw-rw-rw-
test_fnmatch.py	11.38 KB	-rw-rw-rw-
test_fork1.py	3.34 KB	-rw-rw-rw-
test_format.py	24.42 KB	-rw-rw-rw-
test_fractions.py	30.41 KB	-rw-rw-rw-
test_frame.py	6.44 KB	-rw-rw-rw-
test_frozen.py	972 B	-rw-rw-rw-
test_fstring.py	53.85 KB	-rw-rw-rw-
test_ftplib.py	43.12 KB	-rw-rw-rw-
test_funcattrs.py	15.29 KB	-rw-rw-rw-
test_functools.py	105.51 KB	-rw-rw-rw-
test_future.py	15.27 KB	-rw-rw-rw-
test_future3.py	516 B	-rw-rw-rw-
test_future4.py	233 B	-rw-rw-rw-
test_future5.py	531 B	-rw-rw-rw-
test_gc.py	47.3 KB	-rw-rw-rw-
test_gdb.py	42.7 KB	-rw-rw-rw-
test_generator_stop.py	977 B	-rw-rw-rw-
test_generators.py	66.11 KB	-rw-rw-rw-
test_genericalias.py	13.1 KB	-rw-rw-rw-
test_genericclass.py	9.56 KB	-rw-rw-rw-
test_genericpath.py	22.4 KB	-rw-rw-rw-
test_genexps.py	7.92 KB	-rw-rw-rw-
test_getargs2.py	55.19 KB	-rw-rw-rw-
test_getopt.py	6.96 KB	-rw-rw-rw-
test_getpass.py	6.45 KB	-rw-rw-rw-
test_gettext.py	42.36 KB	-rw-rw-rw-
test_glob.py	15.72 KB	-rw-rw-rw-
test_global.py	1.44 KB	-rw-rw-rw-
test_grammar.py	64.47 KB	-rw-rw-rw-
test_graphlib.py	8.59 KB	-rw-rw-rw-
test_grp.py	3.65 KB	-rw-rw-rw-
test_gzip.py	31.45 KB	-rw-rw-rw-
test_hash.py	11.79 KB	-rw-rw-rw-
test_hashlib.py	45.59 KB	-rw-rw-rw-
test_heapq.py	16.91 KB	-rw-rw-rw-
test_hmac.py	26.05 KB	-rw-rw-rw-
test_html.py	4.33 KB	-rw-rw-rw-
test_htmlparser.py	33.7 KB	-rw-rw-rw-
test_http_cookiejar.py	80.28 KB	-rw-rw-rw-
test_http_cookies.py	19.18 KB	-rw-rw-rw-
test_httplib.py	81.2 KB	-rw-rw-rw-
test_httpservers.py	54.65 KB	-rw-rw-rw-
test_idle.py	1.02 KB	-rw-rw-rw-
test_imaplib.py	43.19 KB	-rw-rw-rw-
test_imghdr.py	4.83 KB	-rw-rw-rw-
test_imp.py	18.38 KB	-rw-rw-rw-
test_index.py	8.64 KB	-rw-rw-rw-
test_inspect.py	175.5 KB	-rw-rw-rw-
test_int.py	21.27 KB	-rw-rw-rw-
test_int_literal.py	7.03 KB	-rw-rw-rw-
test_interpreters.py	23.21 KB	-rw-rw-rw-
test_io.py	175.17 KB	-rw-rw-rw-
test_ioctl.py	3.33 KB	-rw-rw-rw-
test_ipaddress.py	119.32 KB	-rw-rw-rw-
test_isinstance.py	13.31 KB	-rw-rw-rw-
test_iter.py	33.93 KB	-rw-rw-rw-
test_iterlen.py	7.32 KB	-rw-rw-rw-
test_itertools.py	108.41 KB	-rw-rw-rw-
test_keyword.py	1.27 KB	-rw-rw-rw-
test_keywordonlyarg.py	7.07 KB	-rw-rw-rw-
test_kqueue.py	9.01 KB	-rw-rw-rw-
test_largefile.py	10.26 KB	-rw-rw-rw-
test_lib2to3.py	327 B	-rw-rw-rw-
test_linecache.py	9.92 KB	-rw-rw-rw-
test_list.py	7.76 KB	-rw-rw-rw-
test_listcomps.py	4.33 KB	-rw-rw-rw-
test_lltrace.py	3.22 KB	-rw-rw-rw-
test_locale.py	25.29 KB	-rw-rw-rw-
test_logging.py	200.75 KB	-rw-rw-rw-
test_long.py	55.19 KB	-rw-rw-rw-
test_longexp.py	243 B	-rw-rw-rw-
test_lzma.py	90.07 KB	-rw-rw-rw-
test_mailbox.py	94.04 KB	-rw-rw-rw-
test_mailcap.py	10.25 KB	-rw-rw-rw-
test_marshal.py	21.04 KB	-rw-rw-rw-
test_math.py	92.69 KB	-rw-rw-rw-
test_memoryio.py	32.33 KB	-rw-rw-rw-
test_memoryview.py	22.01 KB	-rw-rw-rw-
test_metaclass.py	6.47 KB	-rw-rw-rw-
test_mimetypes.py	14.17 KB	-rw-rw-rw-
test_minidom.py	69.82 KB	-rw-rw-rw-
test_mmap.py	31.71 KB	-rw-rw-rw-
test_module.py	12.71 KB	-rw-rw-rw-
test_modulefinder.py	12.63 KB	-rw-rw-rw-
test_msilib.py	5.57 KB	-rw-rw-rw-
test_multibytecodec.py	16.15 KB	-rw-rw-rw-
test_multiprocessing_fork.py	496 B	-rw-rw-rw-
test_multiprocessing_forkserve...	408 B	-rw-rw-rw-
test_multiprocessing_main_hand...	11.86 KB	-rw-rw-rw-
test_multiprocessing_spawn.py	289 B	-rw-rw-rw-
test_named_expressions.py	21.21 KB	-rw-rw-rw-
test_netrc.py	6.17 KB	-rw-rw-rw-
test_nis.py	1.21 KB	-rw-rw-rw-
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Code Editor : test_contextlib.py

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

import io
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
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_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__()
        self.assertRaises(
            RuntimeError, ctx.__exit__, TypeError, TypeError("foo"), 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 _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!"""
        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
        @contextmanager
        def woohoo():
            nonlocal depth
            before = depth
            depth += 1
            yield
            depth -= 1
            self.assertEqual(depth, before)

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

recursive()
        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.assertRaises(AttributeError):
            with mycontext():
                pass

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

with self.assertRaises(AttributeError):
            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_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.__exit__ = object()
        stack = self.exit_stack()
        self.assertRaises(AttributeError, 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(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)

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

${this.title}

Code Editor : test_contextlib.py