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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_deque.py

from collections import deque
import unittest
from test import support, seq_tests
import gc
import weakref
import copy
import pickle
import random
import struct

BIG = 100000

def fail():
    raise SyntaxError
    yield 1

class BadCmp:
    def __eq__(self, other):
        raise RuntimeError

class MutateCmp:
    def __init__(self, deque, result):
        self.deque = deque
        self.result = result
    def __eq__(self, other):
        self.deque.clear()
        return self.result

class TestBasic(unittest.TestCase):

def test_basics(self):
        d = deque(range(-5125, -5000))
        d.__init__(range(200))
        for i in range(200, 400):
            d.append(i)
        for i in reversed(range(-200, 0)):
            d.appendleft(i)
        self.assertEqual(list(d), list(range(-200, 400)))
        self.assertEqual(len(d), 600)

left = [d.popleft() for i in range(250)]
        self.assertEqual(left, list(range(-200, 50)))
        self.assertEqual(list(d), list(range(50, 400)))

right = [d.pop() for i in range(250)]
        right.reverse()
        self.assertEqual(right, list(range(150, 400)))
        self.assertEqual(list(d), list(range(50, 150)))

def test_maxlen(self):
        self.assertRaises(ValueError, deque, 'abc', -1)
        self.assertRaises(ValueError, deque, 'abc', -2)
        it = iter(range(10))
        d = deque(it, maxlen=3)
        self.assertEqual(list(it), [])
        self.assertEqual(repr(d), 'deque([7, 8, 9], maxlen=3)')
        self.assertEqual(list(d), [7, 8, 9])
        self.assertEqual(d, deque(range(10), 3))
        d.append(10)
        self.assertEqual(list(d), [8, 9, 10])
        d.appendleft(7)
        self.assertEqual(list(d), [7, 8, 9])
        d.extend([10, 11])
        self.assertEqual(list(d), [9, 10, 11])
        d.extendleft([8, 7])
        self.assertEqual(list(d), [7, 8, 9])
        d = deque(range(200), maxlen=10)
        d.append(d)
        self.assertEqual(repr(d)[-30:], ', 198, 199, [...]], maxlen=10)')
        d = deque(range(10), maxlen=None)
        self.assertEqual(repr(d), 'deque([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])')

def test_maxlen_zero(self):
        it = iter(range(100))
        deque(it, maxlen=0)
        self.assertEqual(list(it), [])

it = iter(range(100))
        d = deque(maxlen=0)
        d.extend(it)
        self.assertEqual(list(it), [])

it = iter(range(100))
        d = deque(maxlen=0)
        d.extendleft(it)
        self.assertEqual(list(it), [])

def test_maxlen_attribute(self):
        self.assertEqual(deque().maxlen, None)
        self.assertEqual(deque('abc').maxlen, None)
        self.assertEqual(deque('abc', maxlen=4).maxlen, 4)
        self.assertEqual(deque('abc', maxlen=2).maxlen, 2)
        self.assertEqual(deque('abc', maxlen=0).maxlen, 0)
        with self.assertRaises(AttributeError):
            d = deque('abc')
            d.maxlen = 10

def test_count(self):
        for s in ('', 'abracadabra', 'simsalabim'*500+'abc'):
            s = list(s)
            d = deque(s)
            for letter in 'abcdefghijklmnopqrstuvwxyz':
                self.assertEqual(s.count(letter), d.count(letter), (s, d, letter))
        self.assertRaises(TypeError, d.count)       # too few args
        self.assertRaises(TypeError, d.count, 1, 2) # too many args
        class BadCompare:
            def __eq__(self, other):
                raise ArithmeticError
        d = deque([1, 2, BadCompare(), 3])
        self.assertRaises(ArithmeticError, d.count, 2)
        d = deque([1, 2, 3])
        self.assertRaises(ArithmeticError, d.count, BadCompare())
        class MutatingCompare:
            def __eq__(self, other):
                self.d.pop()
                return True
        m = MutatingCompare()
        d = deque([1, 2, 3, m, 4, 5])
        m.d = d
        self.assertRaises(RuntimeError, d.count, 3)

# test issue11004
        # block advance failed after rotation aligned elements on right side of block
        d = deque([None]*16)
        for i in range(len(d)):
            d.rotate(-1)
        d.rotate(1)
        self.assertEqual(d.count(1), 0)
        self.assertEqual(d.count(None), 16)

def test_comparisons(self):
        d = deque('xabc')
        d.popleft()
        for e in [d, deque('abc'), deque('ab'), deque(), list(d)]:
            self.assertEqual(d==e, type(d)==type(e) and list(d)==list(e))
            self.assertEqual(d!=e, not(type(d)==type(e) and list(d)==list(e)))

args = map(deque, ('', 'a', 'b', 'ab', 'ba', 'abc', 'xba', 'xabc', 'cba'))
        for x in args:
            for y in args:
                self.assertEqual(x == y, list(x) == list(y), (x,y))
                self.assertEqual(x != y, list(x) != list(y), (x,y))
                self.assertEqual(x <  y, list(x) <  list(y), (x,y))
                self.assertEqual(x <= y, list(x) <= list(y), (x,y))
                self.assertEqual(x >  y, list(x) >  list(y), (x,y))
                self.assertEqual(x >= y, list(x) >= list(y), (x,y))

def test_contains(self):
        n = 200

d = deque(range(n))
        for i in range(n):
            self.assertTrue(i in d)
        self.assertTrue((n+1) not in d)

# Test detection of mutation during iteration
        d = deque(range(n))
        d[n//2] = MutateCmp(d, False)
        with self.assertRaises(RuntimeError):
            n in d

# Test detection of comparison exceptions
        d = deque(range(n))
        d[n//2] = BadCmp()
        with self.assertRaises(RuntimeError):
            n in d

def test_contains_count_stop_crashes(self):
        class A:
            def __eq__(self, other):
                d.clear()
                return NotImplemented
        d = deque([A(), A()])
        with self.assertRaises(RuntimeError):
            _ = 3 in d
        d = deque([A(), A()])
        with self.assertRaises(RuntimeError):
            _ = d.count(3)

def test_extend(self):
        d = deque('a')
        self.assertRaises(TypeError, d.extend, 1)
        d.extend('bcd')
        self.assertEqual(list(d), list('abcd'))
        d.extend(d)
        self.assertEqual(list(d), list('abcdabcd'))

def test_add(self):
        d = deque()
        e = deque('abc')
        f = deque('def')
        self.assertEqual(d + d, deque())
        self.assertEqual(e + f, deque('abcdef'))
        self.assertEqual(e + e, deque('abcabc'))
        self.assertEqual(e + d, deque('abc'))
        self.assertEqual(d + e, deque('abc'))
        self.assertIsNot(d + d, deque())
        self.assertIsNot(e + d, deque('abc'))
        self.assertIsNot(d + e, deque('abc'))

g = deque('abcdef', maxlen=4)
        h = deque('gh')
        self.assertEqual(g + h, deque('efgh'))

with self.assertRaises(TypeError):
            deque('abc') + 'def'

def test_iadd(self):
        d = deque('a')
        d += 'bcd'
        self.assertEqual(list(d), list('abcd'))
        d += d
        self.assertEqual(list(d), list('abcdabcd'))

def test_extendleft(self):
        d = deque('a')
        self.assertRaises(TypeError, d.extendleft, 1)
        d.extendleft('bcd')
        self.assertEqual(list(d), list(reversed('abcd')))
        d.extendleft(d)
        self.assertEqual(list(d), list('abcddcba'))
        d = deque()
        d.extendleft(range(1000))
        self.assertEqual(list(d), list(reversed(range(1000))))
        self.assertRaises(SyntaxError, d.extendleft, fail())

def test_getitem(self):
        n = 200
        d = deque(range(n))
        l = list(range(n))
        for i in range(n):
            d.popleft()
            l.pop(0)
            if random.random() < 0.5:
                d.append(i)
                l.append(i)
            for j in range(1-len(l), len(l)):
                assert d[j] == l[j]

d = deque('superman')
        self.assertEqual(d[0], 's')
        self.assertEqual(d[-1], 'n')
        d = deque()
        self.assertRaises(IndexError, d.__getitem__, 0)
        self.assertRaises(IndexError, d.__getitem__, -1)

def test_index(self):
        for n in 1, 2, 30, 40, 200:

d = deque(range(n))
            for i in range(n):
                self.assertEqual(d.index(i), i)

with self.assertRaises(ValueError):
                d.index(n+1)

# Test detection of mutation during iteration
            d = deque(range(n))
            d[n//2] = MutateCmp(d, False)
            with self.assertRaises(RuntimeError):
                d.index(n)

# Test detection of comparison exceptions
            d = deque(range(n))
            d[n//2] = BadCmp()
            with self.assertRaises(RuntimeError):
                d.index(n)

# Test start and stop arguments behavior matches list.index()
        elements = 'ABCDEFGHI'
        nonelement = 'Z'
        d = deque(elements * 2)
        s = list(elements * 2)
        for start in range(-5 - len(s)*2, 5 + len(s) * 2):
            for stop in range(-5 - len(s)*2, 5 + len(s) * 2):
                for element in elements + 'Z':
                    try:
                        target = s.index(element, start, stop)
                    except ValueError:
                        with self.assertRaises(ValueError):
                            d.index(element, start, stop)
                    else:
                        self.assertEqual(d.index(element, start, stop), target)

# Test large start argument
        d = deque(range(0, 10000, 10))
        for step in range(100):
            i = d.index(8500, 700)
            self.assertEqual(d[i], 8500)
            # Repeat test with a different internal offset
            d.rotate()

def test_index_bug_24913(self):
        d = deque('A' * 3)
        with self.assertRaises(ValueError):
            i = d.index("Hello world", 0, 4)

def test_insert(self):
        # Test to make sure insert behaves like lists
        elements = 'ABCDEFGHI'
        for i in range(-5 - len(elements)*2, 5 + len(elements) * 2):
            d = deque('ABCDEFGHI')
            s = list('ABCDEFGHI')
            d.insert(i, 'Z')
            s.insert(i, 'Z')
            self.assertEqual(list(d), s)

def test_insert_bug_26194(self):
        data = 'ABC'
        d = deque(data, maxlen=len(data))
        with self.assertRaises(IndexError):
            d.insert(2, None)

elements = 'ABCDEFGHI'
        for i in range(-len(elements), len(elements)):
            d = deque(elements, maxlen=len(elements)+1)
            d.insert(i, 'Z')
            if i >= 0:
                self.assertEqual(d[i], 'Z')
            else:
                self.assertEqual(d[i-1], 'Z')

def test_imul(self):
        for n in (-10, -1, 0, 1, 2, 10, 1000):
            d = deque()
            d *= n
            self.assertEqual(d, deque())
            self.assertIsNone(d.maxlen)

for n in (-10, -1, 0, 1, 2, 10, 1000):
            d = deque('a')
            d *= n
            self.assertEqual(d, deque('a' * n))
            self.assertIsNone(d.maxlen)

for n in (-10, -1, 0, 1, 2, 10, 499, 500, 501, 1000):
            d = deque('a', 500)
            d *= n
            self.assertEqual(d, deque('a' * min(n, 500)))
            self.assertEqual(d.maxlen, 500)

for n in (-10, -1, 0, 1, 2, 10, 1000):
            d = deque('abcdef')
            d *= n
            self.assertEqual(d, deque('abcdef' * n))
            self.assertIsNone(d.maxlen)

for n in (-10, -1, 0, 1, 2, 10, 499, 500, 501, 1000):
            d = deque('abcdef', 500)
            d *= n
            self.assertEqual(d, deque(('abcdef' * n)[-500:]))
            self.assertEqual(d.maxlen, 500)

def test_mul(self):
        d = deque('abc')
        self.assertEqual(d * -5, deque())
        self.assertEqual(d * 0, deque())
        self.assertEqual(d * 1, deque('abc'))
        self.assertEqual(d * 2, deque('abcabc'))
        self.assertEqual(d * 3, deque('abcabcabc'))
        self.assertIsNot(d * 1, d)

self.assertEqual(deque() * 0, deque())
        self.assertEqual(deque() * 1, deque())
        self.assertEqual(deque() * 5, deque())

self.assertEqual(-5 * d, deque())
        self.assertEqual(0 * d, deque())
        self.assertEqual(1 * d, deque('abc'))
        self.assertEqual(2 * d, deque('abcabc'))
        self.assertEqual(3 * d, deque('abcabcabc'))

d = deque('abc', maxlen=5)
        self.assertEqual(d * -5, deque())
        self.assertEqual(d * 0, deque())
        self.assertEqual(d * 1, deque('abc'))
        self.assertEqual(d * 2, deque('bcabc'))
        self.assertEqual(d * 30, deque('bcabc'))

def test_setitem(self):
        n = 200
        d = deque(range(n))
        for i in range(n):
            d[i] = 10 * i
        self.assertEqual(list(d), [10*i for i in range(n)])
        l = list(d)
        for i in range(1-n, 0, -1):
            d[i] = 7*i
            l[i] = 7*i
        self.assertEqual(list(d), l)

def test_delitem(self):
        n = 500         # O(n**2) test, don't make this too big
        d = deque(range(n))
        self.assertRaises(IndexError, d.__delitem__, -n-1)
        self.assertRaises(IndexError, d.__delitem__, n)
        for i in range(n):
            self.assertEqual(len(d), n-i)
            j = random.randrange(-len(d), len(d))
            val = d[j]
            self.assertIn(val, d)
            del d[j]
            self.assertNotIn(val, d)
        self.assertEqual(len(d), 0)

def test_reverse(self):
        n = 500         # O(n**2) test, don't make this too big
        data = [random.random() for i in range(n)]
        for i in range(n):
            d = deque(data[:i])
            r = d.reverse()
            self.assertEqual(list(d), list(reversed(data[:i])))
            self.assertIs(r, None)
            d.reverse()
            self.assertEqual(list(d), data[:i])
        self.assertRaises(TypeError, d.reverse, 1)          # Arity is zero

def test_rotate(self):
        s = tuple('abcde')
        n = len(s)

d = deque(s)
        d.rotate(1)             # verify rot(1)
        self.assertEqual(''.join(d), 'eabcd')

d = deque(s)
        d.rotate(-1)            # verify rot(-1)
        self.assertEqual(''.join(d), 'bcdea')
        d.rotate()              # check default to 1
        self.assertEqual(tuple(d), s)

for i in range(n*3):
            d = deque(s)
            e = deque(d)
            d.rotate(i)         # check vs. rot(1) n times
            for j in range(i):
                e.rotate(1)
            self.assertEqual(tuple(d), tuple(e))
            d.rotate(-i)        # check that it works in reverse
            self.assertEqual(tuple(d), s)
            e.rotate(n-i)       # check that it wraps forward
            self.assertEqual(tuple(e), s)

for i in range(n*3):
            d = deque(s)
            e = deque(d)
            d.rotate(-i)
            for j in range(i):
                e.rotate(-1)    # check vs. rot(-1) n times
            self.assertEqual(tuple(d), tuple(e))
            d.rotate(i)         # check that it works in reverse
            self.assertEqual(tuple(d), s)
            e.rotate(i-n)       # check that it wraps backaround
            self.assertEqual(tuple(e), s)

d = deque(s)
        e = deque(s)
        e.rotate(BIG+17)        # verify on long series of rotates
        dr = d.rotate
        for i in range(BIG+17):
            dr()
        self.assertEqual(tuple(d), tuple(e))

self.assertRaises(TypeError, d.rotate, 'x')   # Wrong arg type
        self.assertRaises(TypeError, d.rotate, 1, 10) # Too many args

d = deque()
        d.rotate()              # rotate an empty deque
        self.assertEqual(d, deque())

def test_len(self):
        d = deque('ab')
        self.assertEqual(len(d), 2)
        d.popleft()
        self.assertEqual(len(d), 1)
        d.pop()
        self.assertEqual(len(d), 0)
        self.assertRaises(IndexError, d.pop)
        self.assertEqual(len(d), 0)
        d.append('c')
        self.assertEqual(len(d), 1)
        d.appendleft('d')
        self.assertEqual(len(d), 2)
        d.clear()
        self.assertEqual(len(d), 0)

def test_underflow(self):
        d = deque()
        self.assertRaises(IndexError, d.pop)
        self.assertRaises(IndexError, d.popleft)

def test_clear(self):
        d = deque(range(100))
        self.assertEqual(len(d), 100)
        d.clear()
        self.assertEqual(len(d), 0)
        self.assertEqual(list(d), [])
        d.clear()               # clear an empty deque
        self.assertEqual(list(d), [])

def test_remove(self):
        d = deque('abcdefghcij')
        d.remove('c')
        self.assertEqual(d, deque('abdefghcij'))
        d.remove('c')
        self.assertEqual(d, deque('abdefghij'))
        self.assertRaises(ValueError, d.remove, 'c')
        self.assertEqual(d, deque('abdefghij'))

# Handle comparison errors
        d = deque(['a', 'b', BadCmp(), 'c'])
        e = deque(d)
        self.assertRaises(RuntimeError, d.remove, 'c')
        for x, y in zip(d, e):
            # verify that original order and values are retained.
            self.assertTrue(x is y)

# Handle evil mutator
        for match in (True, False):
            d = deque(['ab'])
            d.extend([MutateCmp(d, match), 'c'])
            self.assertRaises(IndexError, d.remove, 'c')
            self.assertEqual(d, deque())

def test_repr(self):
        d = deque(range(200))
        e = eval(repr(d))
        self.assertEqual(list(d), list(e))
        d.append(d)
        self.assertEqual(repr(d)[-20:], '7, 198, 199, [...]])')

def test_init(self):
        self.assertRaises(TypeError, deque, 'abc', 2, 3)
        self.assertRaises(TypeError, deque, 1)

def test_hash(self):
        self.assertRaises(TypeError, hash, deque('abc'))

def test_long_steadystate_queue_popleft(self):
        for size in (0, 1, 2, 100, 1000):
            d = deque(range(size))
            append, pop = d.append, d.popleft
            for i in range(size, BIG):
                append(i)
                x = pop()
                if x != i - size:
                    self.assertEqual(x, i-size)
            self.assertEqual(list(d), list(range(BIG-size, BIG)))

def test_long_steadystate_queue_popright(self):
        for size in (0, 1, 2, 100, 1000):
            d = deque(reversed(range(size)))
            append, pop = d.appendleft, d.pop
            for i in range(size, BIG):
                append(i)
                x = pop()
                if x != i - size:
                    self.assertEqual(x, i-size)
            self.assertEqual(list(reversed(list(d))),
                             list(range(BIG-size, BIG)))

def test_big_queue_popleft(self):
        pass
        d = deque()
        append, pop = d.append, d.popleft
        for i in range(BIG):
            append(i)
        for i in range(BIG):
            x = pop()
            if x != i:
                self.assertEqual(x, i)

def test_big_queue_popright(self):
        d = deque()
        append, pop = d.appendleft, d.pop
        for i in range(BIG):
            append(i)
        for i in range(BIG):
            x = pop()
            if x != i:
                self.assertEqual(x, i)

def test_big_stack_right(self):
        d = deque()
        append, pop = d.append, d.pop
        for i in range(BIG):
            append(i)
        for i in reversed(range(BIG)):
            x = pop()
            if x != i:
                self.assertEqual(x, i)
        self.assertEqual(len(d), 0)

def test_big_stack_left(self):
        d = deque()
        append, pop = d.appendleft, d.popleft
        for i in range(BIG):
            append(i)
        for i in reversed(range(BIG)):
            x = pop()
            if x != i:
                self.assertEqual(x, i)
        self.assertEqual(len(d), 0)

def test_roundtrip_iter_init(self):
        d = deque(range(200))
        e = deque(d)
        self.assertNotEqual(id(d), id(e))
        self.assertEqual(list(d), list(e))

def test_pickle(self):
        for d in deque(range(200)), deque(range(200), 100):
            for i in range(pickle.HIGHEST_PROTOCOL + 1):
                s = pickle.dumps(d, i)
                e = pickle.loads(s)
                self.assertNotEqual(id(e), id(d))
                self.assertEqual(list(e), list(d))
                self.assertEqual(e.maxlen, d.maxlen)

def test_pickle_recursive(self):
        for d in deque('abc'), deque('abc', 3):
            d.append(d)
            for i in range(pickle.HIGHEST_PROTOCOL + 1):
                e = pickle.loads(pickle.dumps(d, i))
                self.assertNotEqual(id(e), id(d))
                self.assertEqual(id(e[-1]), id(e))
                self.assertEqual(e.maxlen, d.maxlen)

def test_iterator_pickle(self):
        orig = deque(range(200))
        data = [i*1.01 for i in orig]
        for proto in range(pickle.HIGHEST_PROTOCOL + 1):
            # initial iterator
            itorg = iter(orig)
            dump = pickle.dumps((itorg, orig), proto)
            it, d = pickle.loads(dump)
            for i, x in enumerate(data):
                d[i] = x
            self.assertEqual(type(it), type(itorg))
            self.assertEqual(list(it), data)

# running iterator
            next(itorg)
            dump = pickle.dumps((itorg, orig), proto)
            it, d = pickle.loads(dump)
            for i, x in enumerate(data):
                d[i] = x
            self.assertEqual(type(it), type(itorg))
            self.assertEqual(list(it), data[1:])

# empty iterator
            for i in range(1, len(data)):
                next(itorg)
            dump = pickle.dumps((itorg, orig), proto)
            it, d = pickle.loads(dump)
            for i, x in enumerate(data):
                d[i] = x
            self.assertEqual(type(it), type(itorg))
            self.assertEqual(list(it), [])

# exhausted iterator
            self.assertRaises(StopIteration, next, itorg)
            dump = pickle.dumps((itorg, orig), proto)
            it, d = pickle.loads(dump)
            for i, x in enumerate(data):
                d[i] = x
            self.assertEqual(type(it), type(itorg))
            self.assertEqual(list(it), [])

def test_deepcopy(self):
        mut = [10]
        d = deque([mut])
        e = copy.deepcopy(d)
        self.assertEqual(list(d), list(e))
        mut[0] = 11
        self.assertNotEqual(id(d), id(e))
        self.assertNotEqual(list(d), list(e))

def test_copy(self):
        mut = [10]
        d = deque([mut])
        e = copy.copy(d)
        self.assertEqual(list(d), list(e))
        mut[0] = 11
        self.assertNotEqual(id(d), id(e))
        self.assertEqual(list(d), list(e))

for i in range(5):
            for maxlen in range(-1, 6):
                s = [random.random() for j in range(i)]
                d = deque(s) if maxlen == -1 else deque(s, maxlen)
                e = d.copy()
                self.assertEqual(d, e)
                self.assertEqual(d.maxlen, e.maxlen)
                self.assertTrue(all(x is y for x, y in zip(d, e)))

def test_copy_method(self):
        mut = [10]
        d = deque([mut])
        e = d.copy()
        self.assertEqual(list(d), list(e))
        mut[0] = 11
        self.assertNotEqual(id(d), id(e))
        self.assertEqual(list(d), list(e))

def test_reversed(self):
        for s in ('abcd', range(2000)):
            self.assertEqual(list(reversed(deque(s))), list(reversed(s)))

def test_reversed_new(self):
        klass = type(reversed(deque()))
        for s in ('abcd', range(2000)):
            self.assertEqual(list(klass(deque(s))), list(reversed(s)))

def test_gc_doesnt_blowup(self):
        import gc
        # This used to assert-fail in deque_traverse() under a debug
        # build, or run wild with a NULL pointer in a release build.
        d = deque()
        for i in range(100):
            d.append(1)
            gc.collect()

def test_container_iterator(self):
        # Bug #3680: tp_traverse was not implemented for deque iterator objects
        class C(object):
            pass
        for i in range(2):
            obj = C()
            ref = weakref.ref(obj)
            if i == 0:
                container = deque([obj, 1])
            else:
                container = reversed(deque([obj, 1]))
            obj.x = iter(container)
            del obj, container
            gc.collect()
            self.assertTrue(ref() is None, "Cycle was not collected")

check_sizeof = support.check_sizeof

@support.cpython_only
    def test_sizeof(self):
        BLOCKLEN = 64
        basesize = support.calcvobjsize('2P4nP')
        blocksize = struct.calcsize('P%dPP' % BLOCKLEN)
        self.assertEqual(object.__sizeof__(deque()), basesize)
        check = self.check_sizeof
        check(deque(), basesize + blocksize)
        check(deque('a'), basesize + blocksize)
        check(deque('a' * (BLOCKLEN - 1)), basesize + blocksize)
        check(deque('a' * BLOCKLEN), basesize + 2 * blocksize)
        check(deque('a' * (42 * BLOCKLEN)), basesize + 43 * blocksize)

class TestVariousIteratorArgs(unittest.TestCase):

def test_constructor(self):
        for s in ("123", "", range(1000), ('do', 1.2), range(2000,2200,5)):
            for g in (seq_tests.Sequence, seq_tests.IterFunc,
                      seq_tests.IterGen, seq_tests.IterFuncStop,
                      seq_tests.itermulti, seq_tests.iterfunc):
                self.assertEqual(list(deque(g(s))), list(g(s)))
            self.assertRaises(TypeError, deque, seq_tests.IterNextOnly(s))
            self.assertRaises(TypeError, deque, seq_tests.IterNoNext(s))
            self.assertRaises(ZeroDivisionError, deque, seq_tests.IterGenExc(s))

def test_iter_with_altered_data(self):
        d = deque('abcdefg')
        it = iter(d)
        d.pop()
        self.assertRaises(RuntimeError, next, it)

def test_runtime_error_on_empty_deque(self):
        d = deque()
        it = iter(d)
        d.append(10)
        self.assertRaises(RuntimeError, next, it)

class Deque(deque):
    pass

class DequeWithBadIter(deque):
    def __iter__(self):
        raise TypeError

class TestSubclass(unittest.TestCase):

def test_basics(self):
        d = Deque(range(25))
        d.__init__(range(200))
        for i in range(200, 400):
            d.append(i)
        for i in reversed(range(-200, 0)):
            d.appendleft(i)
        self.assertEqual(list(d), list(range(-200, 400)))
        self.assertEqual(len(d), 600)

left = [d.popleft() for i in range(250)]
        self.assertEqual(left, list(range(-200, 50)))
        self.assertEqual(list(d), list(range(50, 400)))

right = [d.pop() for i in range(250)]
        right.reverse()
        self.assertEqual(right, list(range(150, 400)))
        self.assertEqual(list(d), list(range(50, 150)))

d.clear()
        self.assertEqual(len(d), 0)

def test_copy_pickle(self):

d = Deque('abc')

e = d.__copy__()
        self.assertEqual(type(d), type(e))
        self.assertEqual(list(d), list(e))

e = Deque(d)
        self.assertEqual(type(d), type(e))
        self.assertEqual(list(d), list(e))

for proto in range(pickle.HIGHEST_PROTOCOL + 1):
            s = pickle.dumps(d, proto)
            e = pickle.loads(s)
            self.assertNotEqual(id(d), id(e))
            self.assertEqual(type(d), type(e))
            self.assertEqual(list(d), list(e))

d = Deque('abcde', maxlen=4)

e = d.__copy__()
        self.assertEqual(type(d), type(e))
        self.assertEqual(list(d), list(e))

e = Deque(d)
        self.assertEqual(type(d), type(e))
        self.assertEqual(list(d), list(e))

def test_pickle_recursive(self):
        for proto in range(pickle.HIGHEST_PROTOCOL + 1):
            for d in Deque('abc'), Deque('abc', 3):
                d.append(d)

e = pickle.loads(pickle.dumps(d, proto))
                self.assertNotEqual(id(e), id(d))
                self.assertEqual(type(e), type(d))
                self.assertEqual(e.maxlen, d.maxlen)
                dd = d.pop()
                ee = e.pop()
                self.assertEqual(id(ee), id(e))
                self.assertEqual(e, d)

d.x = d
                e = pickle.loads(pickle.dumps(d, proto))
                self.assertEqual(id(e.x), id(e))

for d in DequeWithBadIter('abc'), DequeWithBadIter('abc', 2):
                self.assertRaises(TypeError, pickle.dumps, d, proto)

def test_weakref(self):
        d = deque('gallahad')
        p = weakref.proxy(d)
        self.assertEqual(str(p), str(d))
        d = None
        support.gc_collect()  # For PyPy or other GCs.
        self.assertRaises(ReferenceError, str, p)

def test_strange_subclass(self):
        class X(deque):
            def __iter__(self):
                return iter([])
        d1 = X([1,2,3])
        d2 = X([4,5,6])
        d1 == d2   # not clear if this is supposed to be True or False,
                   # but it used to give a SystemError

@support.cpython_only
    def test_bug_31608(self):
        # The interpreter used to crash in specific cases where a deque
        # subclass returned a non-deque.
        class X(deque):
            pass
        d = X()
        def bad___new__(cls, *args, **kwargs):
            return [42]
        X.__new__ = bad___new__
        with self.assertRaises(TypeError):
            d * 42  # shouldn't crash
        with self.assertRaises(TypeError):
            d + deque([1, 2, 3])  # shouldn't crash

class SubclassWithKwargs(deque):
    def __init__(self, newarg=1):
        deque.__init__(self)

class TestSubclassWithKwargs(unittest.TestCase):
    def test_subclass_with_kwargs(self):
        # SF bug #1486663 -- this used to erroneously raise a TypeError
        SubclassWithKwargs(newarg=1)

class TestSequence(seq_tests.CommonTest):
    type2test = deque

def test_getitem(self):
        # For now, bypass tests that require slicing
        pass

def test_getslice(self):
        # For now, bypass tests that require slicing
        pass

def test_subscript(self):
        # For now, bypass tests that require slicing
        pass

def test_free_after_iterating(self):
        # For now, bypass tests that require slicing
        self.skipTest("Exhausted deque iterator doesn't free a deque")

#==============================================================================

libreftest = """
Example from the Library Reference:  Doc/lib/libcollections.tex

>>> from collections import deque
>>> d = deque('ghi')                 # make a new deque with three items
>>> for elem in d:                   # iterate over the deque's elements
...     print(elem.upper())
G
H
I
>>> d.append('j')                    # add a new entry to the right side
>>> d.appendleft('f')                # add a new entry to the left side
>>> d                                # show the representation of the deque
deque(['f', 'g', 'h', 'i', 'j'])
>>> d.pop()                          # return and remove the rightmost item
'j'
>>> d.popleft()                      # return and remove the leftmost item
'f'
>>> list(d)                          # list the contents of the deque
['g', 'h', 'i']
>>> d[0]                             # peek at leftmost item
'g'
>>> d[-1]                            # peek at rightmost item
'i'
>>> list(reversed(d))                # list the contents of a deque in reverse
['i', 'h', 'g']
>>> 'h' in d                         # search the deque
True
>>> d.extend('jkl')                  # add multiple elements at once
>>> d
deque(['g', 'h', 'i', 'j', 'k', 'l'])
>>> d.rotate(1)                      # right rotation
>>> d
deque(['l', 'g', 'h', 'i', 'j', 'k'])
>>> d.rotate(-1)                     # left rotation
>>> d
deque(['g', 'h', 'i', 'j', 'k', 'l'])
>>> deque(reversed(d))               # make a new deque in reverse order
deque(['l', 'k', 'j', 'i', 'h', 'g'])
>>> d.clear()                        # empty the deque
>>> d.pop()                          # cannot pop from an empty deque
Traceback (most recent call last):
  File "<pyshell#6>", line 1, in -toplevel-
    d.pop()
IndexError: pop from an empty deque

>>> d.extendleft('abc')              # extendleft() reverses the input order
>>> d
deque(['c', 'b', 'a'])

>>> def delete_nth(d, n):
...     d.rotate(-n)
...     d.popleft()
...     d.rotate(n)
...
>>> d = deque('abcdef')
>>> delete_nth(d, 2)   # remove the entry at d[2]
>>> d
deque(['a', 'b', 'd', 'e', 'f'])

>>> def roundrobin(*iterables):
...     pending = deque(iter(i) for i in iterables)
...     while pending:
...         task = pending.popleft()
...         try:
...             yield next(task)
...         except StopIteration:
...             continue
...         pending.append(task)
...

>>> for value in roundrobin('abc', 'd', 'efgh'):
...     print(value)
...
a
d
e
b
f
c
g
h

>>> def maketree(iterable):
...     d = deque(iterable)
...     while len(d) > 1:
...         pair = [d.popleft(), d.popleft()]
...         d.append(pair)
...     return list(d)
...
>>> print(maketree('abcdefgh'))
[[[['a', 'b'], ['c', 'd']], [['e', 'f'], ['g', 'h']]]]

"""

#==============================================================================

__test__ = {'libreftest' : libreftest}

def test_main(verbose=None):
    import sys
    test_classes = (
        TestBasic,
        TestVariousIteratorArgs,
        TestSubclass,
        TestSubclassWithKwargs,
        TestSequence,
    )

support.run_unittest(*test_classes)

# verify reference counting
    if verbose and hasattr(sys, "gettotalrefcount"):
        import gc
        counts = [None] * 5
        for i in range(len(counts)):
            support.run_unittest(*test_classes)
            gc.collect()
            counts[i] = sys.gettotalrefcount()
        print(counts)

# doctests
    from test import test_deque
    support.run_doctest(test_deque, verbose)

if __name__ == "__main__":
    test_main(verbose=True)

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Code Editor : test_deque.py