Gecko [ beriskala.com ]

Name	Size	Permission	Date
__pycache__	[ DIR ]	drwxr-xr-x	2026-05-01 04:20
audiodata	[ DIR ]	drwxr-xr-x	2026-05-01 04:20
capath	[ DIR ]	drwxr-xr-x	2026-05-01 04:20
cjkencodings	[ DIR ]	drwxr-xr-x	2026-05-01 04:20
data	[ DIR ]	drwxr-xr-x	2026-05-01 04:20
decimaltestdata	[ DIR ]	drwxr-xr-x	2026-05-01 04:20
encoded_modules	[ DIR ]	drwxr-xr-x	2026-05-01 04:20
imghdrdata	[ DIR ]	drwxr-xr-x	2026-05-01 04:20
namespace_pkgs	[ DIR ]	drwxr-xr-x	2026-05-01 04:20
sndhdrdata	[ DIR ]	drwxr-xr-x	2026-05-01 04:20
subprocessdata	[ DIR ]	drwxr-xr-x	2026-05-01 04:20
support	[ DIR ]	drwxr-xr-x	2026-05-01 04:20
test_email	[ DIR ]	drwxr-xr-x	2026-05-01 04:20
test_importlib	[ DIR ]	drwxr-xr-x	2026-05-01 04:20
test_json	[ DIR ]	drwxr-xr-x	2026-05-01 04:20
tracedmodules	[ DIR ]	drwxr-xr-x	2026-05-01 04:20
xmltestdata	[ DIR ]	drwxr-xr-x	2026-05-01 04:20
185test.db	16 KB	-rw-r--r--	2017-09-19 12:02
Sine-1000Hz-300ms.aif	60.25 KB	-rw-r--r--	2017-09-19 12:02
__init__.py	47 B	-rw-r--r--	2024-04-17 20:28
__main__.py	474 B	-rw-r--r--	2024-04-17 20:28
audiotests.py	9.34 KB	-rw-r--r--	2024-04-17 20:28
autotest.py	211 B	-rw-r--r--	2024-04-17 20:28
bad_coding.py	24 B	-rw-r--r--	2024-04-17 20:28
bad_coding2.py	30 B	-rw-r--r--	2024-04-17 20:28
badcert.pem	1.88 KB	-rw-r--r--	2017-09-19 12:02
badkey.pem	2.11 KB	-rw-r--r--	2017-09-19 12:02
badsyntax_3131.py	32 B	-rw-r--r--	2024-04-17 20:28
badsyntax_future3.py	172 B	-rw-r--r--	2024-04-17 20:28
badsyntax_future4.py	153 B	-rw-r--r--	2024-04-17 20:28
badsyntax_future5.py	184 B	-rw-r--r--	2024-04-17 20:28
badsyntax_future6.py	161 B	-rw-r--r--	2024-04-17 20:28
badsyntax_future7.py	196 B	-rw-r--r--	2024-04-17 20:28
badsyntax_future8.py	122 B	-rw-r--r--	2024-04-17 20:28
badsyntax_future9.py	142 B	-rw-r--r--	2024-04-17 20:28
badsyntax_pep3120.py	14 B	-rw-r--r--	2024-04-17 20:28
buffer_tests.py	10.79 KB	-rw-r--r--	2024-04-17 20:28
cfgparser.1	21 B	-rw-r--r--	2017-09-19 12:02
cfgparser.2	19.02 KB	-rw-r--r--	2017-09-19 12:02
cfgparser.3	1.55 KB	-rw-r--r--	2017-09-19 12:02
check_soundcard.vbs	411 B	-rw-r--r--	2017-09-19 12:02
cmath_testcases.txt	133.86 KB	-rw-r--r--	2017-09-19 12:02
coding20731.py	18 B	-rw-r--r--	2024-04-17 20:28
curses_tests.py	1.22 KB	-rwxr-xr-x	2024-04-17 20:28
datetimetester.py	146.82 KB	-rw-r--r--	2024-04-17 20:28
dh1024.pem	300 B	-rw-r--r--	2017-09-19 12:02
dis_module.py	76 B	-rw-r--r--	2024-04-17 20:28
doctest_aliases.py	240 B	-rw-r--r--	2024-04-17 20:28
double_const.py	1.18 KB	-rw-r--r--	2024-04-17 20:28
empty.vbs	70 B	-rw-r--r--	2017-09-19 12:02
exception_hierarchy.txt	1.69 KB	-rw-r--r--	2017-09-19 12:02
floating_points.txt	15.92 KB	-rw-r--r--	2017-09-19 12:02
fork_wait.py	2.1 KB	-rw-r--r--	2024-04-17 20:28
formatfloat_testcases.txt	7.45 KB	-rw-r--r--	2017-09-19 12:02
future_test1.py	229 B	-rw-r--r--	2024-04-17 20:28
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gdb_sample.py	153 B	-rw-r--r--	2024-04-17 20:28
ieee754.txt	3.21 KB	-rw-r--r--	2017-09-19 12:02
inspect_fodder.py	854 B	-rw-r--r--	2024-04-17 20:28
inspect_fodder2.py	1.39 KB	-rw-r--r--	2024-04-17 20:28
keycert.passwd.pem	1.79 KB	-rw-r--r--	2017-09-19 12:02
keycert.pem	1.74 KB	-rw-r--r--	2017-09-19 12:02
keycert2.pem	1.75 KB	-rw-r--r--	2017-09-19 12:02
list_tests.py	17.26 KB	-rw-r--r--	2024-04-17 20:28
lock_tests.py	25.47 KB	-rw-r--r--	2024-04-17 20:28
mailcap.txt	1.24 KB	-rw-r--r--	2017-09-19 12:02
make_ssl_certs.py	1.84 KB	-rw-r--r--	2024-04-17 20:28
mapping_tests.py	21.5 KB	-rw-r--r--	2024-04-17 20:28
math_testcases.txt	23.19 KB	-rw-r--r--	2017-09-19 12:02
memory_watchdog.py	859 B	-rw-r--r--	2024-04-17 20:28
mime.types	47.37 KB	-rw-r--r--	2017-09-19 12:02
mock_socket.py	3.32 KB	-rw-r--r--	2024-04-17 20:28
mp_fork_bomb.py	323 B	-rw-r--r--	2024-04-17 20:28
multibytecodec_support.py	14.25 KB	-rw-r--r--	2024-04-17 20:28
nokia.pem	1.88 KB	-rw-r--r--	2017-09-19 12:02
nullbytecert.pem	5.31 KB	-rw-r--r--	2017-09-19 12:02
nullcert.pem	0 B	-rw-r--r--	2017-09-19 12:02
outstanding_bugs.py	370 B	-rw-r--r--	2024-04-17 20:28
pickletester.py	60.31 KB	-rw-r--r--	2024-04-17 20:28
profilee.py	2.97 KB	-rw-r--r--	2024-04-17 20:28
pstats.pck	65.05 KB	-rw-r--r--	2017-09-19 12:02
pyclbr_input.py	648 B	-rw-r--r--	2024-04-17 20:28
pydoc_mod.py	461 B	-rw-r--r--	2024-04-17 20:28
pydocfodder.py	6.18 KB	-rw-r--r--	2024-04-17 20:28
pystone.py	7.22 KB	-rwxr-xr-x	2024-04-17 20:28
randv2_32.pck	7.34 KB	-rw-r--r--	2017-09-19 12:02
randv2_64.pck	7.19 KB	-rw-r--r--	2017-09-19 12:02
randv3.pck	7.82 KB	-rw-r--r--	2017-09-19 12:02
re_tests.py	31.06 KB	-rwxr-xr-x	2024-04-17 20:28
regrtest.py	63.54 KB	-rwxr-xr-x	2024-04-17 20:28
relimport.py	27 B	-rw-r--r--	2024-04-17 20:28
reperf.py	538 B	-rw-r--r--	2024-04-17 20:28
sample_doctest.py	1.02 KB	-rw-r--r--	2024-04-17 20:28
sample_doctest_no_docstrings.py	227 B	-rw-r--r--	2024-04-17 20:28
sample_doctest_no_doctests.py	269 B	-rw-r--r--	2024-04-17 20:28
script_helper.py	5.22 KB	-rw-r--r--	2024-04-17 20:28
selfsigned_pythontestdotnet.pem	956 B	-rw-r--r--	2017-09-19 12:02
seq_tests.py	13.49 KB	-rw-r--r--	2024-04-17 20:28
sgml_input.html	8.1 KB	-rw-r--r--	2017-09-19 12:02
sha256.pem	8.15 KB	-rw-r--r--	2017-09-19 12:02
sortperf.py	4.69 KB	-rw-r--r--	2024-04-17 20:28
ssl_cert.pem	867 B	-rw-r--r--	2017-09-19 12:02
ssl_key.passwd.pem	963 B	-rw-r--r--	2017-09-19 12:02
ssl_key.pem	916 B	-rw-r--r--	2017-09-19 12:02
ssl_servers.py	6.82 KB	-rw-r--r--	2024-04-17 20:28
string_tests.py	62.74 KB	-rw-r--r--	2024-04-17 20:28
test___all__.py	3.86 KB	-rw-r--r--	2024-04-17 20:28
test___future__.py	2.44 KB	-rw-r--r--	2024-04-17 20:28
test__locale.py	6.89 KB	-rw-r--r--	2024-04-17 20:28
test__osx_support.py	11.41 KB	-rw-r--r--	2024-04-17 20:28
test_abc.py	12.76 KB	-rw-r--r--	2024-04-17 20:28
test_abstract_numbers.py	1.49 KB	-rw-r--r--	2024-04-17 20:28
test_aifc.py	14.48 KB	-rw-r--r--	2024-04-17 20:28
test_argparse.py	158.6 KB	-rw-r--r--	2024-04-17 20:28
test_array.py	43.88 KB	-rw-r--r--	2024-04-17 20:28
test_ast.py	43.49 KB	-rw-r--r--	2024-04-17 20:28
test_asynchat.py	9.08 KB	-rw-r--r--	2024-04-17 20:28
test_asyncore.py	26.05 KB	-rw-r--r--	2024-04-17 20:28
test_atexit.py	3.53 KB	-rw-r--r--	2024-04-17 20:28
test_audioop.py	17.39 KB	-rw-r--r--	2024-04-17 20:28
test_augassign.py	7.44 KB	-rw-r--r--	2024-04-17 20:28
test_base64.py	14.34 KB	-rw-r--r--	2024-04-17 20:28
test_bigaddrspace.py	2.92 KB	-rw-r--r--	2024-04-17 20:28
test_bigmem.py	44.18 KB	-rw-r--r--	2024-04-17 20:28
test_binascii.py	9.94 KB	-rw-r--r--	2024-04-17 20:28
test_binhex.py	1.47 KB	-rw-r--r--	2024-04-17 20:28
test_binop.py	12.36 KB	-rw-r--r--	2024-04-17 20:28
test_bisect.py	13.65 KB	-rw-r--r--	2024-04-17 20:28
test_bool.py	11.81 KB	-rw-r--r--	2024-04-17 20:28
test_buffer.py	155.09 KB	-rw-r--r--	2024-04-17 20:28
test_bufio.py	2.54 KB	-rw-r--r--	2024-04-17 20:28
test_builtin.py	54.84 KB	-rw-r--r--	2024-04-17 20:28
test_bytes.py	52.86 KB	-rw-r--r--	2024-04-17 20:28
test_bz2.py	30.8 KB	-rw-r--r--	2024-04-17 20:28
test_calendar.py	38.7 KB	-rw-r--r--	2024-04-17 20:28
test_call.py	3.08 KB	-rw-r--r--	2024-04-17 20:28
test_capi.py	13.81 KB	-rw-r--r--	2024-04-17 20:28
test_cgi.py	17.34 KB	-rw-r--r--	2024-04-17 20:28
test_cgitb.py	2.49 KB	-rw-r--r--	2024-04-17 20:28
test_charmapcodec.py	1.75 KB	-rw-r--r--	2024-04-17 20:28
test_class.py	13.79 KB	-rw-r--r--	2024-04-17 20:28
test_cmath.py	20.38 KB	-rw-r--r--	2024-04-17 20:28
test_cmd.py	6.08 KB	-rw-r--r--	2024-04-17 20:28
test_cmd_line.py	15.35 KB	-rw-r--r--	2024-04-17 20:28
test_cmd_line_script.py	16.95 KB	-rw-r--r--	2024-04-17 20:28
test_code.py	3.54 KB	-rw-r--r--	2024-04-17 20:28
test_code_module.py	2.42 KB	-rw-r--r--	2024-04-17 20:28
test_codeccallbacks.py	33.17 KB	-rw-r--r--	2024-04-17 20:28
test_codecencodings_cn.py	3.38 KB	-rw-r--r--	2024-04-17 20:28
test_codecencodings_hk.py	775 B	-rw-r--r--	2024-04-17 20:28
test_codecencodings_iso2022.py	1.43 KB	-rw-r--r--	2024-04-17 20:28
test_codecencodings_jp.py	4.86 KB	-rw-r--r--	2024-04-17 20:28
test_codecencodings_kr.py	3.03 KB	-rw-r--r--	2024-04-17 20:28
test_codecencodings_tw.py	755 B	-rw-r--r--	2024-04-17 20:28
test_codecmaps_cn.py	930 B	-rw-r--r--	2024-04-17 20:28
test_codecmaps_hk.py	505 B	-rw-r--r--	2024-04-17 20:28
test_codecmaps_jp.py	1.88 KB	-rw-r--r--	2024-04-17 20:28
test_codecmaps_kr.py	1.34 KB	-rw-r--r--	2024-04-17 20:28
test_codecmaps_tw.py	880 B	-rw-r--r--	2024-04-17 20:28
test_codecs.py	96.02 KB	-rw-r--r--	2024-04-17 20:28
test_codeop.py	7.45 KB	-rw-r--r--	2024-04-17 20:28
test_coding.py	2.51 KB	-rw-r--r--	2024-04-17 20:28
test_collections.py	54.31 KB	-rw-r--r--	2024-04-17 20:28
test_colorsys.py	2.77 KB	-rw-r--r--	2024-04-17 20:28
test_compare.py	1.63 KB	-rw-r--r--	2024-04-17 20:28
test_compile.py	18.62 KB	-rw-r--r--	2024-04-17 20:28
test_compileall.py	15.73 KB	-rw-r--r--	2024-04-17 20:28
test_complex.py	27.09 KB	-rw-r--r--	2024-04-17 20:28
test_concurrent_futures.py	22.57 KB	-rw-r--r--	2024-04-17 20:28
test_configparser.py	69.26 KB	-rw-r--r--	2024-04-17 20:28
test_contains.py	2.58 KB	-rw-r--r--	2024-04-17 20:28
test_contextlib.py	21.39 KB	-rw-r--r--	2024-04-17 20:28
test_copy.py	21.9 KB	-rw-r--r--	2024-04-17 20:28
test_copyreg.py	4.12 KB	-rw-r--r--	2024-04-17 20:28
test_cprofile.py	5.32 KB	-rw-r--r--	2024-04-17 20:28
test_crashers.py	1.18 KB	-rw-r--r--	2024-04-17 20:28
test_crypt.py	1.24 KB	-rw-r--r--	2024-04-17 20:28
test_csv.py	40.9 KB	-rw-r--r--	2024-04-17 20:28
test_ctypes.py	400 B	-rw-r--r--	2024-04-17 20:28
test_curses.py	10.7 KB	-rw-r--r--	2024-04-17 20:28
test_datetime.py	1.81 KB	-rw-r--r--	2024-04-17 20:28
test_dbm.py	5.52 KB	-rw-r--r--	2024-04-17 20:28
test_dbm_dumb.py	5.49 KB	-rw-r--r--	2024-04-17 20:28
test_dbm_gnu.py	2.85 KB	-rw-r--r--	2024-04-17 20:28
test_dbm_ndbm.py	1.13 KB	-rw-r--r--	2024-04-17 20:28
test_decimal.py	197.66 KB	-rw-r--r--	2024-04-17 20:28
test_decorators.py	9.6 KB	-rw-r--r--	2024-04-17 20:28
test_defaultdict.py	5.94 KB	-rw-r--r--	2024-04-17 20:28
test_deque.py	25 KB	-rw-r--r--	2024-04-17 20:28
test_descr.py	156.64 KB	-rw-r--r--	2024-04-17 20:28
test_descrtut.py	11.5 KB	-rw-r--r--	2024-04-17 20:28
test_devpoll.py	3.49 KB	-rw-r--r--	2024-04-17 20:28
test_dict.py	31.11 KB	-rw-r--r--	2024-04-17 20:28
test_dictcomps.py	3.69 KB	-rw-r--r--	2024-04-17 20:28
test_dictviews.py	8.51 KB	-rw-r--r--	2024-04-17 20:28
test_difflib.py	10.78 KB	-rw-r--r--	2024-04-17 20:28
test_difflib_expect.html	100.86 KB	-rw-r--r--	2017-09-19 12:02
test_dis.py	12.33 KB	-rw-r--r--	2024-04-17 20:28
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test_doctest.py	81.78 KB	-rw-r--r--	2024-04-17 20:28
test_doctest.txt	300 B	-rw-r--r--	2017-09-19 12:02
test_doctest2.py	2.3 KB	-rw-r--r--	2024-04-17 20:28
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test_eof.py	855 B	-rw-r--r--	2024-04-17 20:28
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test_fnmatch.py	2.84 KB	-rw-r--r--	2024-04-17 20:28
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test_future4.py	105 B	-rw-r--r--	2024-04-17 20:28
test_future5.py	510 B	-rw-r--r--	2024-04-17 20:28
test_gc.py	29 KB	-rw-r--r--	2024-04-17 20:28
test_gdb.py	35.86 KB	-rw-r--r--	2024-04-17 20:28
test_generators.py	48.5 KB	-rw-r--r--	2024-04-17 20:28
test_genericpath.py	13.3 KB	-rw-r--r--	2024-04-17 20:28
test_genexps.py	7.12 KB	-rw-r--r--	2024-04-17 20:28
test_getargs2.py	23.74 KB	-rw-r--r--	2024-04-17 20:28
test_getopt.py	6.8 KB	-rw-r--r--	2024-04-17 20:28
test_getpass.py	5.95 KB	-rw-r--r--	2024-04-17 20:28
test_gettext.py	22.11 KB	-rw-r--r--	2024-04-17 20:28
test_glob.py	6.69 KB	-rw-r--r--	2024-04-17 20:28
test_global.py	1.25 KB	-rw-r--r--	2024-04-17 20:28
test_grammar.py	31.96 KB	-rw-r--r--	2024-04-17 20:28
test_grp.py	3.18 KB	-rw-r--r--	2024-04-17 20:28
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test_heapq.py	14.14 KB	-rw-r--r--	2024-04-17 20:28
test_hmac.py	17.23 KB	-rw-r--r--	2024-04-17 20:28
test_html.py	579 B	-rw-r--r--	2024-04-17 20:28
test_htmlparser.py	30.74 KB	-rw-r--r--	2024-04-17 20:28
test_http_cookiejar.py	70 KB	-rw-r--r--	2024-04-17 20:28
test_http_cookies.py	9.98 KB	-rw-r--r--	2024-04-17 20:28
test_httplib.py	37.59 KB	-rw-r--r--	2024-04-17 20:28
test_httpservers.py	26.35 KB	-rw-r--r--	2024-04-17 20:28
test_idle.py	1.3 KB	-rw-r--r--	2024-04-17 20:28
test_imaplib.py	15.67 KB	-rw-r--r--	2024-04-17 20:28
test_imghdr.py	4.31 KB	-rw-r--r--	2024-04-17 20:28
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Rename

# We import importlib *ASAP* in order to test #15386
import importlib
from importlib._bootstrap import _get_sourcefile
import builtins
import imp
from test.test_importlib.import_ import util as importlib_util
import marshal
import os
import platform
import py_compile
import random
import stat
import sys
import unittest
import unittest.mock as mock
import textwrap
import errno
import shutil
import contextlib

import test.support
from test.support import (
    EnvironmentVarGuard, TESTFN, check_warnings, forget, is_jython,
    make_legacy_pyc, rmtree, run_unittest, swap_attr, swap_item, temp_umask,
    unlink, unload, create_empty_file, cpython_only)
from test import script_helper

skip_if_dont_write_bytecode = unittest.skipIf(
        sys.dont_write_bytecode,
        "test meaningful only when writing bytecode")

def remove_files(name):
    for f in (name + ".py",
              name + ".pyc",
              name + ".pyo",
              name + ".pyw",
              name + "$py.class"):
        unlink(f)
    rmtree('__pycache__')

@contextlib.contextmanager
def _ready_to_import(name=None, source=""):
    # sets up a temporary directory and removes it
    # creates the module file
    # temporarily clears the module from sys.modules (if any)
    # reverts or removes the module when cleaning up
    name = name or "spam"
    with script_helper.temp_dir() as tempdir:
        path = script_helper.make_script(tempdir, name, source)
        old_module = sys.modules.pop(name, None)
        try:
            sys.path.insert(0, tempdir)
            yield name, path
            sys.path.remove(tempdir)
        finally:
            if old_module is not None:
                sys.modules[name] = old_module
            elif name in sys.modules:
                del sys.modules[name]

class ImportTests(unittest.TestCase):

def setUp(self):
        remove_files(TESTFN)
        importlib.invalidate_caches()

def tearDown(self):
        unload(TESTFN)

setUp = tearDown

def test_case_sensitivity(self):
        # Brief digression to test that import is case-sensitive:  if we got
        # this far, we know for sure that "random" exists.
        with self.assertRaises(ImportError):
            import RAnDoM

def test_double_const(self):
        # Another brief digression to test the accuracy of manifest float
        # constants.
        from test import double_const  # don't blink -- that *was* the test

def test_import(self):
        def test_with_extension(ext):
            # The extension is normally ".py", perhaps ".pyw".
            source = TESTFN + ext
            pyo = TESTFN + ".pyo"
            if is_jython:
                pyc = TESTFN + "$py.class"
            else:
                pyc = TESTFN + ".pyc"

with open(source, "w") as f:
                print("# This tests Python's ability to import a",
                      ext, "file.", file=f)
                a = random.randrange(1000)
                b = random.randrange(1000)
                print("a =", a, file=f)
                print("b =", b, file=f)

if TESTFN in sys.modules:
                del sys.modules[TESTFN]
            importlib.invalidate_caches()
            try:
                try:
                    mod = __import__(TESTFN)
                except ImportError as err:
                    self.fail("import from %s failed: %s" % (ext, err))

self.assertEqual(mod.a, a,
                    "module loaded (%s) but contents invalid" % mod)
                self.assertEqual(mod.b, b,
                    "module loaded (%s) but contents invalid" % mod)
            finally:
                forget(TESTFN)
                unlink(source)
                unlink(pyc)
                unlink(pyo)

sys.path.insert(0, os.curdir)
        try:
            test_with_extension(".py")
            if sys.platform.startswith("win"):
                for ext in [".PY", ".Py", ".pY", ".pyw", ".PYW", ".pYw"]:
                    test_with_extension(ext)
        finally:
            del sys.path[0]

@skip_if_dont_write_bytecode
    def test_bug7732(self):
        source = TESTFN + '.py'
        os.mkdir(source)
        try:
            self.assertRaisesRegex(ImportError, '^No module',
                imp.find_module, TESTFN, ["."])
        finally:
            os.rmdir(source)

def test_module_with_large_stack(self, module='longlist'):
        # Regression test for http://bugs.python.org/issue561858.
        filename = module + '.py'

# Create a file with a list of 65000 elements.
        with open(filename, 'w') as f:
            f.write('d = [\n')
            for i in range(65000):
                f.write('"",\n')
            f.write(']')

try:
            # Compile & remove .py file; we only need .pyc (or .pyo).
            # Bytecode must be relocated from the PEP 3147 bytecode-only location.
            py_compile.compile(filename)
        finally:
            unlink(filename)

# Need to be able to load from current dir.
        sys.path.append('')
        importlib.invalidate_caches()

try:
            make_legacy_pyc(filename)
            # This used to crash.
            exec('import ' + module)
        finally:
            # Cleanup.
            del sys.path[-1]
            unlink(filename + 'c')
            unlink(filename + 'o')

def test_failing_import_sticks(self):
        source = TESTFN + ".py"
        with open(source, "w") as f:
            print("a = 1/0", file=f)

# New in 2.4, we shouldn't be able to import that no matter how often
        # we try.
        sys.path.insert(0, os.curdir)
        importlib.invalidate_caches()
        if TESTFN in sys.modules:
            del sys.modules[TESTFN]
        try:
            for i in [1, 2, 3]:
                self.assertRaises(ZeroDivisionError, __import__, TESTFN)
                self.assertNotIn(TESTFN, sys.modules,
                                 "damaged module in sys.modules on %i try" % i)
        finally:
            del sys.path[0]
            remove_files(TESTFN)

def test_import_name_binding(self):
        # import x.y.z binds x in the current namespace
        import test as x
        import test.support
        self.assertTrue(x is test, x.__name__)
        self.assertTrue(hasattr(test.support, "__file__"))

# import x.y.z as w binds z as w
        import test.support as y
        self.assertTrue(y is test.support, y.__name__)

def test_failing_reload(self):
        # A failing reload should leave the module object in sys.modules.
        source = TESTFN + os.extsep + "py"
        with open(source, "w") as f:
            f.write("a = 1\nb=2\n")

sys.path.insert(0, os.curdir)
        try:
            mod = __import__(TESTFN)
            self.assertIn(TESTFN, sys.modules)
            self.assertEqual(mod.a, 1, "module has wrong attribute values")
            self.assertEqual(mod.b, 2, "module has wrong attribute values")

# On WinXP, just replacing the .py file wasn't enough to
            # convince reload() to reparse it.  Maybe the timestamp didn't
            # move enough.  We force it to get reparsed by removing the
            # compiled file too.
            remove_files(TESTFN)

# Now damage the module.
            with open(source, "w") as f:
                f.write("a = 10\nb=20//0\n")

self.assertRaises(ZeroDivisionError, imp.reload, mod)
            # But we still expect the module to be in sys.modules.
            mod = sys.modules.get(TESTFN)
            self.assertIsNot(mod, None, "expected module to be in sys.modules")

# We should have replaced a w/ 10, but the old b value should
            # stick.
            self.assertEqual(mod.a, 10, "module has wrong attribute values")
            self.assertEqual(mod.b, 2, "module has wrong attribute values")

finally:
            del sys.path[0]
            remove_files(TESTFN)
            unload(TESTFN)

@skip_if_dont_write_bytecode
    def test_file_to_source(self):
        # check if __file__ points to the source file where available
        source = TESTFN + ".py"
        with open(source, "w") as f:
            f.write("test = None\n")

sys.path.insert(0, os.curdir)
        try:
            mod = __import__(TESTFN)
            self.assertTrue(mod.__file__.endswith('.py'))
            os.remove(source)
            del sys.modules[TESTFN]
            make_legacy_pyc(source)
            importlib.invalidate_caches()
            mod = __import__(TESTFN)
            base, ext = os.path.splitext(mod.__file__)
            self.assertIn(ext, ('.pyc', '.pyo'))
        finally:
            del sys.path[0]
            remove_files(TESTFN)
            if TESTFN in sys.modules:
                del sys.modules[TESTFN]

def test_import_by_filename(self):
        path = os.path.abspath(TESTFN)
        encoding = sys.getfilesystemencoding()
        try:
            path.encode(encoding)
        except UnicodeEncodeError:
            self.skipTest('path is not encodable to {}'.format(encoding))
        with self.assertRaises(ImportError) as c:
            __import__(path)

def test_import_in_del_does_not_crash(self):
        # Issue 4236
        testfn = script_helper.make_script('', TESTFN, textwrap.dedent("""\
            import sys
            class C:
               def __del__(self):
                  import imp
            sys.argv.insert(0, C())
            """))
        script_helper.assert_python_ok(testfn)

def test_timestamp_overflow(self):
        # A modification timestamp larger than 2**32 should not be a problem
        # when importing a module (issue #11235).
        sys.path.insert(0, os.curdir)
        try:
            source = TESTFN + ".py"
            compiled = imp.cache_from_source(source)
            with open(source, 'w') as f:
                pass
            try:
                os.utime(source, (2 ** 33 - 5, 2 ** 33 - 5))
            except OverflowError:
                self.skipTest("cannot set modification time to large integer")
            except OSError as e:
                if e.errno != getattr(errno, 'EOVERFLOW', None):
                    raise
                self.skipTest("cannot set modification time to large integer ({})".format(e))
            __import__(TESTFN)
            # The pyc file was created.
            os.stat(compiled)
        finally:
            del sys.path[0]
            remove_files(TESTFN)

def test_bogus_fromlist(self):
        try:
            __import__('http', fromlist=['blah'])
        except ImportError:
            self.fail("fromlist must allow bogus names")

@cpython_only
    def test_delete_builtins_import(self):
        args = ["-c", "del __builtins__.__import__; import os"]
        popen = script_helper.spawn_python(*args)
        stdout, stderr = popen.communicate()
        self.assertIn(b"ImportError", stdout)

@skip_if_dont_write_bytecode
class FilePermissionTests(unittest.TestCase):
    # tests for file mode on cached .pyc/.pyo files

@unittest.skipUnless(os.name == 'posix',
                         "test meaningful only on posix systems")
    def test_creation_mode(self):
        mask = 0o022
        with temp_umask(mask), _ready_to_import() as (name, path):
            cached_path = imp.cache_from_source(path)
            module = __import__(name)
            if not os.path.exists(cached_path):
                self.fail("__import__ did not result in creation of "
                          "either a .pyc or .pyo file")
            stat_info = os.stat(cached_path)

# Check that the umask is respected, and the executable bits
        # aren't set.
        self.assertEqual(oct(stat.S_IMODE(stat_info.st_mode)),
                         oct(0o666 & ~mask))

@unittest.skipUnless(os.name == 'posix',
                         "test meaningful only on posix systems")
    def test_cached_mode_issue_2051(self):
        # permissions of .pyc should match those of .py, regardless of mask
        mode = 0o600
        with temp_umask(0o022), _ready_to_import() as (name, path):
            cached_path = imp.cache_from_source(path)
            os.chmod(path, mode)
            __import__(name)
            if not os.path.exists(cached_path):
                self.fail("__import__ did not result in creation of "
                          "either a .pyc or .pyo file")
            stat_info = os.stat(cached_path)

self.assertEqual(oct(stat.S_IMODE(stat_info.st_mode)), oct(mode))

@unittest.skipUnless(os.name == 'posix',
                         "test meaningful only on posix systems")
    def test_cached_readonly(self):
        mode = 0o400
        with temp_umask(0o022), _ready_to_import() as (name, path):
            cached_path = imp.cache_from_source(path)
            os.chmod(path, mode)
            __import__(name)
            if not os.path.exists(cached_path):
                self.fail("__import__ did not result in creation of "
                          "either a .pyc or .pyo file")
            stat_info = os.stat(cached_path)

expected = mode | 0o200 # Account for fix for issue #6074
        self.assertEqual(oct(stat.S_IMODE(stat_info.st_mode)), oct(expected))

def test_pyc_always_writable(self):
        # Initially read-only .pyc files on Windows used to cause problems
        # with later updates, see issue #6074 for details
        with _ready_to_import() as (name, path):
            # Write a Python file, make it read-only and import it
            with open(path, 'w') as f:
                f.write("x = 'original'\n")
            # Tweak the mtime of the source to ensure pyc gets updated later
            s = os.stat(path)
            os.utime(path, (s.st_atime, s.st_mtime-100000000))
            os.chmod(path, 0o400)
            m = __import__(name)
            self.assertEqual(m.x, 'original')
            # Change the file and then reimport it
            os.chmod(path, 0o600)
            with open(path, 'w') as f:
                f.write("x = 'rewritten'\n")
            unload(name)
            importlib.invalidate_caches()
            m = __import__(name)
            self.assertEqual(m.x, 'rewritten')
            # Now delete the source file and check the pyc was rewritten
            unlink(path)
            unload(name)
            importlib.invalidate_caches()
            if __debug__:
                bytecode_only = path + "c"
            else:
                bytecode_only = path + "o"
            os.rename(imp.cache_from_source(path), bytecode_only)
            m = __import__(name)
            self.assertEqual(m.x, 'rewritten')

class PycRewritingTests(unittest.TestCase):
    # Test that the `co_filename` attribute on code objects always points
    # to the right file, even when various things happen (e.g. both the .py
    # and the .pyc file are renamed).

module_name = "unlikely_module_name"
    module_source = """
import sys
code_filename = sys._getframe().f_code.co_filename
module_filename = __file__
constant = 1
def func():
    pass
func_filename = func.__code__.co_filename
"""
    dir_name = os.path.abspath(TESTFN)
    file_name = os.path.join(dir_name, module_name) + os.extsep + "py"
    compiled_name = imp.cache_from_source(file_name)

def setUp(self):
        self.sys_path = sys.path[:]
        self.orig_module = sys.modules.pop(self.module_name, None)
        os.mkdir(self.dir_name)
        with open(self.file_name, "w") as f:
            f.write(self.module_source)
        sys.path.insert(0, self.dir_name)
        importlib.invalidate_caches()

def tearDown(self):
        sys.path[:] = self.sys_path
        if self.orig_module is not None:
            sys.modules[self.module_name] = self.orig_module
        else:
            unload(self.module_name)
        unlink(self.file_name)
        unlink(self.compiled_name)
        rmtree(self.dir_name)

def import_module(self):
        ns = globals()
        __import__(self.module_name, ns, ns)
        return sys.modules[self.module_name]

def test_basics(self):
        mod = self.import_module()
        self.assertEqual(mod.module_filename, self.file_name)
        self.assertEqual(mod.code_filename, self.file_name)
        self.assertEqual(mod.func_filename, self.file_name)
        del sys.modules[self.module_name]
        mod = self.import_module()
        self.assertEqual(mod.module_filename, self.file_name)
        self.assertEqual(mod.code_filename, self.file_name)
        self.assertEqual(mod.func_filename, self.file_name)

def test_incorrect_code_name(self):
        py_compile.compile(self.file_name, dfile="another_module.py")
        mod = self.import_module()
        self.assertEqual(mod.module_filename, self.file_name)
        self.assertEqual(mod.code_filename, self.file_name)
        self.assertEqual(mod.func_filename, self.file_name)

def test_module_without_source(self):
        target = "another_module.py"
        py_compile.compile(self.file_name, dfile=target)
        os.remove(self.file_name)
        pyc_file = make_legacy_pyc(self.file_name)
        importlib.invalidate_caches()
        mod = self.import_module()
        self.assertEqual(mod.module_filename, pyc_file)
        self.assertEqual(mod.code_filename, target)
        self.assertEqual(mod.func_filename, target)

def test_foreign_code(self):
        py_compile.compile(self.file_name)
        with open(self.compiled_name, "rb") as f:
            header = f.read(12)
            code = marshal.load(f)
        constants = list(code.co_consts)
        foreign_code = test_main.__code__
        pos = constants.index(1)
        constants[pos] = foreign_code
        code = type(code)(code.co_argcount, code.co_kwonlyargcount,
                          code.co_nlocals, code.co_stacksize,
                          code.co_flags, code.co_code, tuple(constants),
                          code.co_names, code.co_varnames, code.co_filename,
                          code.co_name, code.co_firstlineno, code.co_lnotab,
                          code.co_freevars, code.co_cellvars)
        with open(self.compiled_name, "wb") as f:
            f.write(header)
            marshal.dump(code, f)
        mod = self.import_module()
        self.assertEqual(mod.constant.co_filename, foreign_code.co_filename)

class PathsTests(unittest.TestCase):
    SAMPLES = ('test', 'test\u00e4\u00f6\u00fc\u00df', 'test\u00e9\u00e8',
               'test\u00b0\u00b3\u00b2')
    path = TESTFN

def setUp(self):
        os.mkdir(self.path)
        self.syspath = sys.path[:]

def tearDown(self):
        rmtree(self.path)
        sys.path[:] = self.syspath

# Regression test for http://bugs.python.org/issue1293.
    def test_trailing_slash(self):
        with open(os.path.join(self.path, 'test_trailing_slash.py'), 'w') as f:
            f.write("testdata = 'test_trailing_slash'")
        sys.path.append(self.path+'/')
        mod = __import__("test_trailing_slash")
        self.assertEqual(mod.testdata, 'test_trailing_slash')
        unload("test_trailing_slash")

# Regression test for http://bugs.python.org/issue3677.
    @unittest.skipUnless(sys.platform == 'win32', 'Windows-specific')
    def test_UNC_path(self):
        with open(os.path.join(self.path, 'test_unc_path.py'), 'w') as f:
            f.write("testdata = 'test_unc_path'")
        importlib.invalidate_caches()
        # Create the UNC path, like \\myhost\c$\foo\bar.
        path = os.path.abspath(self.path)
        import socket
        hn = socket.gethostname()
        drive = path[0]
        unc = "\\\\%s\\%s$"%(hn, drive)
        unc += path[2:]
        try:
            os.listdir(unc)
        except OSError as e:
            if e.errno in (errno.EPERM, errno.EACCES):
                # See issue #15338
                self.skipTest("cannot access administrative share %r" % (unc,))
            raise
        sys.path.insert(0, unc)
        try:
            mod = __import__("test_unc_path")
        except ImportError as e:
            self.fail("could not import 'test_unc_path' from %r: %r"
                      % (unc, e))
        self.assertEqual(mod.testdata, 'test_unc_path')
        self.assertTrue(mod.__file__.startswith(unc), mod.__file__)
        unload("test_unc_path")

class RelativeImportTests(unittest.TestCase):

def tearDown(self):
        unload("test.relimport")
    setUp = tearDown

def test_relimport_star(self):
        # This will import * from .test_import.
        from . import relimport
        self.assertTrue(hasattr(relimport, "RelativeImportTests"))

def test_issue3221(self):
        # Note for mergers: the 'absolute' tests from the 2.x branch
        # are missing in Py3k because implicit relative imports are
        # a thing of the past
        #
        # Regression test for http://bugs.python.org/issue3221.
        def check_relative():
            exec("from . import relimport", ns)

# Check relative import OK with __package__ and __name__ correct
        ns = dict(__package__='test', __name__='test.notarealmodule')
        check_relative()

# Check relative import OK with only __name__ wrong
        ns = dict(__package__='test', __name__='notarealpkg.notarealmodule')
        check_relative()

# Check relative import fails with only __package__ wrong
        ns = dict(__package__='foo', __name__='test.notarealmodule')
        self.assertRaises(SystemError, check_relative)

# Check relative import fails with __package__ and __name__ wrong
        ns = dict(__package__='foo', __name__='notarealpkg.notarealmodule')
        self.assertRaises(SystemError, check_relative)

# Check relative import fails with package set to a non-string
        ns = dict(__package__=object())
        self.assertRaises(TypeError, check_relative)

def test_absolute_import_without_future(self):
        # If explicit relative import syntax is used, then do not try
        # to perform an absolute import in the face of failure.
        # Issue #7902.
        with self.assertRaises(ImportError):
            from .os import sep
            self.fail("explicit relative import triggered an "
                      "implicit absolute import")

class OverridingImportBuiltinTests(unittest.TestCase):
    def test_override_builtin(self):
        # Test that overriding builtins.__import__ can bypass sys.modules.
        import os

def foo():
            import os
            return os
        self.assertEqual(foo(), os)  # Quick sanity check.

with swap_attr(builtins, "__import__", lambda *x: 5):
            self.assertEqual(foo(), 5)

# Test what happens when we shadow __import__ in globals(); this
        # currently does not impact the import process, but if this changes,
        # other code will need to change, so keep this test as a tripwire.
        with swap_item(globals(), "__import__", lambda *x: 5):
            self.assertEqual(foo(), os)

class PycacheTests(unittest.TestCase):
    # Test the various PEP 3147 related behaviors.

tag = imp.get_tag()

def _clean(self):
        forget(TESTFN)
        rmtree('__pycache__')
        unlink(self.source)

def setUp(self):
        self.source = TESTFN + '.py'
        self._clean()
        with open(self.source, 'w') as fp:
            print('# This is a test file written by test_import.py', file=fp)
        sys.path.insert(0, os.curdir)
        importlib.invalidate_caches()

def tearDown(self):
        assert sys.path[0] == os.curdir, 'Unexpected sys.path[0]'
        del sys.path[0]
        self._clean()

@skip_if_dont_write_bytecode
    def test_import_pyc_path(self):
        self.assertFalse(os.path.exists('__pycache__'))
        __import__(TESTFN)
        self.assertTrue(os.path.exists('__pycache__'))
        self.assertTrue(os.path.exists(os.path.join(
            '__pycache__', '{}.{}.py{}'.format(
            TESTFN, self.tag, 'c' if __debug__ else 'o'))))

@unittest.skipUnless(os.name == 'posix',
                         "test meaningful only on posix systems")
    @unittest.skipIf(hasattr(os, 'geteuid') and os.geteuid() == 0,
            "due to varying filesystem permission semantics (issue #11956)")
    @skip_if_dont_write_bytecode
    def test_unwritable_directory(self):
        # When the umask causes the new __pycache__ directory to be
        # unwritable, the import still succeeds but no .pyc file is written.
        with temp_umask(0o222):
            __import__(TESTFN)
        self.assertTrue(os.path.exists('__pycache__'))
        self.assertFalse(os.path.exists(os.path.join(
            '__pycache__', '{}.{}.pyc'.format(TESTFN, self.tag))))

@skip_if_dont_write_bytecode
    def test_missing_source(self):
        # With PEP 3147 cache layout, removing the source but leaving the pyc
        # file does not satisfy the import.
        __import__(TESTFN)
        pyc_file = imp.cache_from_source(self.source)
        self.assertTrue(os.path.exists(pyc_file))
        os.remove(self.source)
        forget(TESTFN)
        self.assertRaises(ImportError, __import__, TESTFN)

@skip_if_dont_write_bytecode
    def test_missing_source_legacy(self):
        # Like test_missing_source() except that for backward compatibility,
        # when the pyc file lives where the py file would have been (and named
        # without the tag), it is importable.  The __file__ of the imported
        # module is the pyc location.
        __import__(TESTFN)
        # pyc_file gets removed in _clean() via tearDown().
        pyc_file = make_legacy_pyc(self.source)
        os.remove(self.source)
        unload(TESTFN)
        importlib.invalidate_caches()
        m = __import__(TESTFN)
        self.assertEqual(m.__file__,
                         os.path.join(os.curdir, os.path.relpath(pyc_file)))

def test___cached__(self):
        # Modules now also have an __cached__ that points to the pyc file.
        m = __import__(TESTFN)
        pyc_file = imp.cache_from_source(TESTFN + '.py')
        self.assertEqual(m.__cached__, os.path.join(os.curdir, pyc_file))

@skip_if_dont_write_bytecode
    def test___cached___legacy_pyc(self):
        # Like test___cached__() except that for backward compatibility,
        # when the pyc file lives where the py file would have been (and named
        # without the tag), it is importable.  The __cached__ of the imported
        # module is the pyc location.
        __import__(TESTFN)
        # pyc_file gets removed in _clean() via tearDown().
        pyc_file = make_legacy_pyc(self.source)
        os.remove(self.source)
        unload(TESTFN)
        importlib.invalidate_caches()
        m = __import__(TESTFN)
        self.assertEqual(m.__cached__,
                         os.path.join(os.curdir, os.path.relpath(pyc_file)))

@skip_if_dont_write_bytecode
    def test_package___cached__(self):
        # Like test___cached__ but for packages.
        def cleanup():
            rmtree('pep3147')
            unload('pep3147.foo')
            unload('pep3147')
        os.mkdir('pep3147')
        self.addCleanup(cleanup)
        # Touch the __init__.py
        with open(os.path.join('pep3147', '__init__.py'), 'w'):
            pass
        with open(os.path.join('pep3147', 'foo.py'), 'w'):
            pass
        importlib.invalidate_caches()
        m = __import__('pep3147.foo')
        init_pyc = imp.cache_from_source(
            os.path.join('pep3147', '__init__.py'))
        self.assertEqual(m.__cached__, os.path.join(os.curdir, init_pyc))
        foo_pyc = imp.cache_from_source(os.path.join('pep3147', 'foo.py'))
        self.assertEqual(sys.modules['pep3147.foo'].__cached__,
                         os.path.join(os.curdir, foo_pyc))

def test_package___cached___from_pyc(self):
        # Like test___cached__ but ensuring __cached__ when imported from a
        # PEP 3147 pyc file.
        def cleanup():
            rmtree('pep3147')
            unload('pep3147.foo')
            unload('pep3147')
        os.mkdir('pep3147')
        self.addCleanup(cleanup)
        # Touch the __init__.py
        with open(os.path.join('pep3147', '__init__.py'), 'w'):
            pass
        with open(os.path.join('pep3147', 'foo.py'), 'w'):
            pass
        importlib.invalidate_caches()
        m = __import__('pep3147.foo')
        unload('pep3147.foo')
        unload('pep3147')
        importlib.invalidate_caches()
        m = __import__('pep3147.foo')
        init_pyc = imp.cache_from_source(
            os.path.join('pep3147', '__init__.py'))
        self.assertEqual(m.__cached__, os.path.join(os.curdir, init_pyc))
        foo_pyc = imp.cache_from_source(os.path.join('pep3147', 'foo.py'))
        self.assertEqual(sys.modules['pep3147.foo'].__cached__,
                         os.path.join(os.curdir, foo_pyc))

def test_recompute_pyc_same_second(self):
        # Even when the source file doesn't change timestamp, a change in
        # source size is enough to trigger recomputation of the pyc file.
        __import__(TESTFN)
        unload(TESTFN)
        with open(self.source, 'a') as fp:
            print("x = 5", file=fp)
        m = __import__(TESTFN)
        self.assertEqual(m.x, 5)

class TestSymbolicallyLinkedPackage(unittest.TestCase):
    package_name = 'sample'
    tagged = package_name + '-tagged'

def setUp(self):
        test.support.rmtree(self.tagged)
        test.support.rmtree(self.package_name)
        self.orig_sys_path = sys.path[:]

# create a sample package; imagine you have a package with a tag and
        #  you want to symbolically link it from its untagged name.
        os.mkdir(self.tagged)
        self.addCleanup(test.support.rmtree, self.tagged)
        init_file = os.path.join(self.tagged, '__init__.py')
        test.support.create_empty_file(init_file)
        assert os.path.exists(init_file)

# now create a symlink to the tagged package
        # sample -> sample-tagged
        os.symlink(self.tagged, self.package_name, target_is_directory=True)
        self.addCleanup(test.support.unlink, self.package_name)
        importlib.invalidate_caches()

self.assertEqual(os.path.isdir(self.package_name), True)

assert os.path.isfile(os.path.join(self.package_name, '__init__.py'))

def tearDown(self):
        sys.path[:] = self.orig_sys_path

# regression test for issue6727
    @unittest.skipUnless(
        not hasattr(sys, 'getwindowsversion')
        or sys.getwindowsversion() >= (6, 0),
        "Windows Vista or later required")
    @test.support.skip_unless_symlink
    def test_symlinked_dir_importable(self):
        # make sure sample can only be imported from the current directory.
        sys.path[:] = ['.']
        assert os.path.exists(self.package_name)
        assert os.path.exists(os.path.join(self.package_name, '__init__.py'))

# Try to import the package
        importlib.import_module(self.package_name)

@cpython_only
class ImportlibBootstrapTests(unittest.TestCase):
    # These tests check that importlib is bootstrapped.

def test_frozen_importlib(self):
        mod = sys.modules['_frozen_importlib']
        self.assertTrue(mod)

def test_frozen_importlib_is_bootstrap(self):
        from importlib import _bootstrap
        mod = sys.modules['_frozen_importlib']
        self.assertIs(mod, _bootstrap)
        self.assertEqual(mod.__name__, 'importlib._bootstrap')
        self.assertEqual(mod.__package__, 'importlib')
        self.assertTrue(mod.__file__.endswith('_bootstrap.py'), mod.__file__)

def test_there_can_be_only_one(self):
        # Issue #15386 revealed a tricky loophole in the bootstrapping
        # This test is technically redundant, since the bug caused importing
        # this test module to crash completely, but it helps prove the point
        from importlib import machinery
        mod = sys.modules['_frozen_importlib']
        self.assertIs(machinery.FileFinder, mod.FileFinder)
        self.assertIs(imp.new_module, mod.new_module)

@cpython_only
class GetSourcefileTests(unittest.TestCase):

"""Test importlib._bootstrap._get_sourcefile() as used by the C API.

Because of the peculiarities of the need of this function, the tests are
    knowingly whitebox tests.

"""

def test_get_sourcefile(self):
        # Given a valid bytecode path, return the path to the corresponding
        # source file if it exists.
        with mock.patch('importlib._bootstrap._path_isfile') as _path_isfile:
            _path_isfile.return_value = True;
            path = TESTFN + '.pyc'
            expect = TESTFN + '.py'
            self.assertEqual(_get_sourcefile(path), expect)

def test_get_sourcefile_no_source(self):
        # Given a valid bytecode path without a corresponding source path,
        # return the original bytecode path.
        with mock.patch('importlib._bootstrap._path_isfile') as _path_isfile:
            _path_isfile.return_value = False;
            path = TESTFN + '.pyc'
            self.assertEqual(_get_sourcefile(path), path)

def test_get_sourcefile_bad_ext(self):
        # Given a path with an invalid bytecode extension, return the
        # bytecode path passed as the argument.
        path = TESTFN + '.bad_ext'
        self.assertEqual(_get_sourcefile(path), path)

class ImportTracebackTests(unittest.TestCase):

def setUp(self):
        os.mkdir(TESTFN)
        self.old_path = sys.path[:]
        sys.path.insert(0, TESTFN)

def tearDown(self):
        sys.path[:] = self.old_path
        rmtree(TESTFN)

def create_module(self, mod, contents, ext=".py"):
        fname = os.path.join(TESTFN, mod + ext)
        with open(fname, "w") as f:
            f.write(contents)
        self.addCleanup(unload, mod)
        importlib.invalidate_caches()
        return fname

def assert_traceback(self, tb, files):
        deduped_files = []
        while tb:
            code = tb.tb_frame.f_code
            fn = code.co_filename
            if not deduped_files or fn != deduped_files[-1]:
                deduped_files.append(fn)
            tb = tb.tb_next
        self.assertEqual(len(deduped_files), len(files), deduped_files)
        for fn, pat in zip(deduped_files, files):
            self.assertIn(pat, fn)

def test_nonexistent_module(self):
        try:
            # assertRaises() clears __traceback__
            import nonexistent_xyzzy
        except ImportError as e:
            tb = e.__traceback__
        else:
            self.fail("ImportError should have been raised")
        self.assert_traceback(tb, [__file__])

def test_nonexistent_module_nested(self):
        self.create_module("foo", "import nonexistent_xyzzy")
        try:
            import foo
        except ImportError as e:
            tb = e.__traceback__
        else:
            self.fail("ImportError should have been raised")
        self.assert_traceback(tb, [__file__, 'foo.py'])

def test_exec_failure(self):
        self.create_module("foo", "1/0")
        try:
            import foo
        except ZeroDivisionError as e:
            tb = e.__traceback__
        else:
            self.fail("ZeroDivisionError should have been raised")
        self.assert_traceback(tb, [__file__, 'foo.py'])

def test_exec_failure_nested(self):
        self.create_module("foo", "import bar")
        self.create_module("bar", "1/0")
        try:
            import foo
        except ZeroDivisionError as e:
            tb = e.__traceback__
        else:
            self.fail("ZeroDivisionError should have been raised")
        self.assert_traceback(tb, [__file__, 'foo.py', 'bar.py'])

# A few more examples from issue #15425
    def test_syntax_error(self):
        self.create_module("foo", "invalid syntax is invalid")
        try:
            import foo
        except SyntaxError as e:
            tb = e.__traceback__
        else:
            self.fail("SyntaxError should have been raised")
        self.assert_traceback(tb, [__file__])

def _setup_broken_package(self, parent, child):
        pkg_name = "_parent_foo"
        self.addCleanup(unload, pkg_name)
        pkg_path = os.path.join(TESTFN, pkg_name)
        os.mkdir(pkg_path)
        # Touch the __init__.py
        init_path = os.path.join(pkg_path, '__init__.py')
        with open(init_path, 'w') as f:
            f.write(parent)
        bar_path = os.path.join(pkg_path, 'bar.py')
        with open(bar_path, 'w') as f:
            f.write(child)
        importlib.invalidate_caches()
        return init_path, bar_path

def test_broken_submodule(self):
        init_path, bar_path = self._setup_broken_package("", "1/0")
        try:
            import _parent_foo.bar
        except ZeroDivisionError as e:
            tb = e.__traceback__
        else:
            self.fail("ZeroDivisionError should have been raised")
        self.assert_traceback(tb, [__file__, bar_path])

def test_broken_from(self):
        init_path, bar_path = self._setup_broken_package("", "1/0")
        try:
            from _parent_foo import bar
        except ZeroDivisionError as e:
            tb = e.__traceback__
        else:
            self.fail("ImportError should have been raised")
        self.assert_traceback(tb, [__file__, bar_path])

def test_broken_parent(self):
        init_path, bar_path = self._setup_broken_package("1/0", "")
        try:
            import _parent_foo.bar
        except ZeroDivisionError as e:
            tb = e.__traceback__
        else:
            self.fail("ZeroDivisionError should have been raised")
        self.assert_traceback(tb, [__file__, init_path])

def test_broken_parent_from(self):
        init_path, bar_path = self._setup_broken_package("1/0", "")
        try:
            from _parent_foo import bar
        except ZeroDivisionError as e:
            tb = e.__traceback__
        else:
            self.fail("ZeroDivisionError should have been raised")
        self.assert_traceback(tb, [__file__, init_path])

@cpython_only
    def test_import_bug(self):
        # We simulate a bug in importlib and check that it's not stripped
        # away from the traceback.
        self.create_module("foo", "")
        importlib = sys.modules['_frozen_importlib']
        old_load_module = importlib.SourceLoader.load_module
        try:
            def load_module(*args):
                1/0
            importlib.SourceLoader.load_module = load_module
            try:
                import foo
            except ZeroDivisionError as e:
                tb = e.__traceback__
            else:
                self.fail("ZeroDivisionError should have been raised")
            self.assert_traceback(tb, [__file__, '<frozen importlib', __file__])
        finally:
            importlib.SourceLoader.load_module = old_load_module

def test_main(verbose=None):
    run_unittest(ImportTests, PycacheTests, FilePermissionTests,
                 PycRewritingTests, PathsTests, RelativeImportTests,
                 OverridingImportBuiltinTests,
                 ImportlibBootstrapTests, GetSourcefileTests,
                 TestSymbolicallyLinkedPackage,
                 ImportTracebackTests)

if __name__ == '__main__':
    # Test needs to be a package, so we can do relative imports.
    from test.test_import import test_main
    test_main()