cpython/Lib/test/test_cmd_line.py at 8b31927ad89e0f26ce27eaec6b59168625f654ef · python/cpython

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# Tests invocation of the interpreter with various command line arguments

# Most tests are executed with environment variables ignored

# See test_cmd_line_script.py for testing of script execution

import os

import subprocess

import sys

import sysconfig

import tempfile

import unittest

from test import support

from test.support.script_helper import (

spawn_python, kill_python, assert_python_ok, assert_python_failure,

interpreter_requires_environment

)

# Debug build?

Py_DEBUG = hasattr(sys, "gettotalrefcount")

# XXX (ncoghlan): Move to script_helper and make consistent with run_python

def _kill_python_and_exit_code(p):

data = kill_python(p)

returncode = p.wait()

return data, returncode

class CmdLineTest(unittest.TestCase):

def test_directories(self):

assert_python_failure('.')

assert_python_failure('< .')

def verify_valid_flag(self, cmd_line):

rc, out, err = assert_python_ok(*cmd_line)

self.assertTrue(out == b'' or out.endswith(b'\n'))

self.assertNotIn(b'Traceback', out)

self.assertNotIn(b'Traceback', err)

def test_optimize(self):

self.verify_valid_flag('-O')

self.verify_valid_flag('-OO')

def test_site_flag(self):

self.verify_valid_flag('-S')

def test_usage(self):

rc, out, err = assert_python_ok('-h')

self.assertIn(b'usage', out)

def test_version(self):

version = ('Python %d.%d' % sys.version_info[:2]).encode("ascii")

for switch in '-V', '--version', '-VV':

rc, out, err = assert_python_ok(switch)

self.assertFalse(err.startswith(version))

self.assertTrue(out.startswith(version))

def test_verbose(self):

# -v causes imports to write to stderr. If the write to

# stderr itself causes an import to happen (for the output

# codec), a recursion loop can occur.

rc, out, err = assert_python_ok('-v')

self.assertNotIn(b'stack overflow', err)

rc, out, err = assert_python_ok('-vv')

self.assertNotIn(b'stack overflow', err)

@unittest.skipIf(interpreter_requires_environment(),

'Cannot run -E tests when PYTHON env vars are required.')

def test_xoptions(self):

def get_xoptions(*args):

# use subprocess module directly because test.support.script_helper adds

# "-X faulthandler" to the command line

args = (sys.executable, '-E') + args

args += ('-c', 'import sys; print(sys._xoptions)')

out = subprocess.check_output(args)

opts = eval(out.splitlines()[0])

return opts

opts = get_xoptions()

self.assertEqual(opts, {})

opts = get_xoptions('-Xa', '-Xb=c,d=e')

self.assertEqual(opts, {'a': True, 'b': 'c,d=e'})

def test_showrefcount(self):

def run_python(*args):

# this is similar to assert_python_ok but doesn't strip

# the refcount from stderr. It can be replaced once

# assert_python_ok stops doing that.

cmd = [sys.executable]

cmd.extend(args)

PIPE = subprocess.PIPE

p = subprocess.Popen(cmd, stdout=PIPE, stderr=PIPE)

out, err = p.communicate()

p.stdout.close()

p.stderr.close()

rc = p.returncode

self.assertEqual(rc, 0)

return rc, out, err

code = 'import sys; print(sys._xoptions)'

# normally the refcount is hidden

rc, out, err = run_python('-c', code)

self.assertEqual(out.rstrip(), b'{}')

self.assertEqual(err, b'')

# "-X showrefcount" shows the refcount, but only in debug builds

rc, out, err = run_python('-X', 'showrefcount', '-c', code)

self.assertEqual(out.rstrip(), b"{'showrefcount': True}")

if Py_DEBUG:

self.assertRegex(err, br'^\[\d+ refs, \d+ blocks\]')

else:

self.assertEqual(err, b'')

def test_run_module(self):

# Test expected operation of the '-m' switch

# Switch needs an argument

assert_python_failure('-m')

# Check we get an error for a nonexistent module

assert_python_failure('-m', 'fnord43520xyz')

# Check the runpy module also gives an error for

# a nonexistent module

assert_python_failure('-m', 'runpy', 'fnord43520xyz')

# All good if module is located and run successfully

assert_python_ok('-m', 'timeit', '-n', '1')

def test_run_module_bug1764407(self):

# -m and -i need to play well together

# Runs the timeit module and checks the __main__

# namespace has been populated appropriately

p = spawn_python('-i', '-m', 'timeit', '-n', '1')

p.stdin.write(b'Timer\n')

p.stdin.write(b'exit()\n')

data = kill_python(p)

self.assertTrue(data.find(b'1 loop') != -1)

self.assertTrue(data.find(b'__main__.Timer') != -1)

def test_run_code(self):

# Test expected operation of the '-c' switch

# Switch needs an argument

assert_python_failure('-c')

# Check we get an error for an uncaught exception

assert_python_failure('-c', 'raise Exception')

# All good if execution is successful

assert_python_ok('-c', 'pass')

@unittest.skipUnless(support.FS_NONASCII, 'need support.FS_NONASCII')

def test_non_ascii(self):

# Test handling of non-ascii data

command = ("assert(ord(%r) == %s)"

% (support.FS_NONASCII, ord(support.FS_NONASCII)))

assert_python_ok('-c', command)

# On Windows, pass bytes to subprocess doesn't test how Python decodes the

# command line, but how subprocess does decode bytes to unicode. Python

# doesn't decode the command line because Windows provides directly the

# arguments as unicode (using wmain() instead of main()).

@unittest.skipIf(sys.platform == 'win32',

'Windows has a native unicode API')

def test_undecodable_code(self):

undecodable = b"\xff"

env = os.environ.copy()

# Use C locale to get ascii for the locale encoding

env['LC_ALL'] = 'C'

env['PYTHONCOERCECLOCALE'] = '0'

code = (

b'import locale; '

b'print(ascii("' + undecodable + b'"), '

b'locale.getpreferredencoding())')

p = subprocess.Popen(

[sys.executable, "-c", code],

stdout=subprocess.PIPE, stderr=subprocess.STDOUT,

env=env)

stdout, stderr = p.communicate()

if p.returncode == 1:

# _Py_char2wchar() decoded b'\xff' as '\udcff' (b'\xff' is not

# decodable from ASCII) and run_command() failed on

# PyUnicode_AsUTF8String(). This is the expected behaviour on

# Linux.

pattern = b"Unable to decode the command from the command line:"

elif p.returncode == 0:

# _Py_char2wchar() decoded b'\xff' as '\xff' even if the locale is

# C and the locale encoding is ASCII. It occurs on FreeBSD, Solaris

# and Mac OS X.

pattern = b"'\\xff' "

# The output is followed by the encoding name, an alias to ASCII.

# Examples: "US-ASCII" or "646" (ISO 646, on Solaris).

else:

raise AssertionError("Unknown exit code: %s, output=%a" % (p.returncode, stdout))

if not stdout.startswith(pattern):

raise AssertionError("%a doesn't start with %a" % (stdout, pattern))

@unittest.skipUnless((sys.platform == 'darwin' or

support.is_android), 'test specific to Mac OS X and Android')

def test_osx_android_utf8(self):

def check_output(text):

decoded = text.decode('utf-8', 'surrogateescape')

expected = ascii(decoded).encode('ascii') + b'\n'

env = os.environ.copy()

# C locale gives ASCII locale encoding, but Python uses UTF-8

# to parse the command line arguments on Mac OS X and Android.

env['LC_ALL'] = 'C'

p = subprocess.Popen(

(sys.executable, "-c", "import sys; print(ascii(sys.argv[1]))", text),

stdout=subprocess.PIPE,

env=env)

stdout, stderr = p.communicate()

self.assertEqual(stdout, expected)

self.assertEqual(p.returncode, 0)

# test valid utf-8

text = 'e:\xe9, euro:\u20ac, non-bmp:\U0010ffff'.encode('utf-8')

check_output(text)

# test invalid utf-8

text = (

b'\xff' # invalid byte

b'\xc3\xa9' # valid utf-8 character

b'\xc3\xff' # invalid byte sequence

b'\xed\xa0\x80' # lone surrogate character (invalid)

)

check_output(text)

def test_unbuffered_output(self):

# Test expected operation of the '-u' switch

for stream in ('stdout', 'stderr'):

# Binary is unbuffered

code = ("import os, sys; sys.%s.buffer.write(b'x'); os._exit(0)"

% stream)

rc, out, err = assert_python_ok('-u', '-c', code)

data = err if stream == 'stderr' else out

self.assertEqual(data, b'x', "binary %s not unbuffered" % stream)

# Text is unbuffered

code = ("import os, sys; sys.%s.write('x'); os._exit(0)"

% stream)

rc, out, err = assert_python_ok('-u', '-c', code)

data = err if stream == 'stderr' else out

self.assertEqual(data, b'x', "text %s not unbuffered" % stream)

def test_unbuffered_input(self):

# sys.stdin still works with '-u'

code = ("import sys; sys.stdout.write(sys.stdin.read(1))")

p = spawn_python('-u', '-c', code)

p.stdin.write(b'x')

p.stdin.flush()

data, rc = _kill_python_and_exit_code(p)

self.assertEqual(rc, 0)

self.assertTrue(data.startswith(b'x'), data)

def test_large_PYTHONPATH(self):

path1 = "ABCDE" * 100

path2 = "FGHIJ" * 100

path = path1 + os.pathsep + path2

code = """if 1:

import sys

path = ":".join(sys.path)

path = path.encode("ascii", "backslashreplace")

sys.stdout.buffer.write(path)"""

rc, out, err = assert_python_ok('-S', '-c', code,

PYTHONPATH=path)

self.assertIn(path1.encode('ascii'), out)

self.assertIn(path2.encode('ascii'), out)

def test_empty_PYTHONPATH_issue16309(self):

# On Posix, it is documented that setting PATH to the

# empty string is equivalent to not setting PATH at all,

# which is an exception to the rule that in a string like

# "/bin::/usr/bin" the empty string in the middle gets

# interpreted as '.'

code = """if 1:

import sys

path = ":".join(sys.path)

path = path.encode("ascii", "backslashreplace")

sys.stdout.buffer.write(path)"""

rc1, out1, err1 = assert_python_ok('-c', code, PYTHONPATH="")

rc2, out2, err2 = assert_python_ok('-c', code, __isolated=False)

# regarding to Posix specification, outputs should be equal

# for empty and unset PYTHONPATH

self.assertEqual(out1, out2)

def test_displayhook_unencodable(self):

for encoding in ('ascii', 'latin-1', 'utf-8'):

env = os.environ.copy()

env['PYTHONIOENCODING'] = encoding

p = subprocess.Popen(

[sys.executable, '-i'],

stdin=subprocess.PIPE,

stdout=subprocess.PIPE,

stderr=subprocess.STDOUT,

env=env)

# non-ascii, surrogate, non-BMP printable, non-BMP unprintable

text = "a=\xe9 b=\uDC80 c=\U00010000 d=\U0010FFFF"

p.stdin.write(ascii(text).encode('ascii') + b"\n")

p.stdin.write(b'exit()\n')

data = kill_python(p)

escaped = repr(text).encode(encoding, 'backslashreplace')

self.assertIn(escaped, data)

def check_input(self, code, expected):

with tempfile.NamedTemporaryFile("wb+") as stdin:

sep = os.linesep.encode('ASCII')

stdin.write(sep.join((b'abc', b'def')))

stdin.flush()

stdin.seek(0)

with subprocess.Popen(

(sys.executable, "-c", code),

stdin=stdin, stdout=subprocess.PIPE) as proc:

stdout, stderr = proc.communicate()

self.assertEqual(stdout.rstrip(), expected)

def test_stdin_readline(self):

# Issue #11272: check that sys.stdin.readline() replaces '\r\n' by '\n'

# on Windows (sys.stdin is opened in binary mode)

self.check_input(

"import sys; print(repr(sys.stdin.readline()))",

b"'abc\\n'")

def test_builtin_input(self):

# Issue #11272: check that input() strips newlines ('\n' or '\r\n')

self.check_input(

"print(repr(input()))",

b"'abc'")

def test_output_newline(self):

# Issue 13119 Newline for print() should be \r\n on Windows.

code = """if 1:

import sys

print(1)

print(2)

print(3, file=sys.stderr)

print(4, file=sys.stderr)"""

rc, out, err = assert_python_ok('-c', code)

if sys.platform == 'win32':

self.assertEqual(b'1\r\n2\r\n', out)

self.assertEqual(b'3\r\n4', err)

else:

self.assertEqual(b'1\n2\n', out)

self.assertEqual(b'3\n4', err)

def test_unmached_quote(self):

# Issue #10206: python program starting with unmatched quote

# spewed spaces to stdout

rc, out, err = assert_python_failure('-c', "'")

self.assertRegex(err.decode('ascii', 'ignore'), 'SyntaxError')

self.assertEqual(b'', out)

def test_stdout_flush_at_shutdown(self):

# Issue #5319: if stdout.flush() fails at shutdown, an error should

# be printed out.

code = """if 1:

import os, sys, test.support

test.support.SuppressCrashReport().__enter__()

sys.stdout.write('x')

os.close(sys.stdout.fileno())"""

rc, out, err = assert_python_failure('-c', code)

self.assertEqual(b'', out)

self.assertEqual(120, rc)

self.assertRegex(err.decode('ascii', 'ignore'),

'Exception ignored in.*\nOSError: .*')

def test_closed_stdout(self):

# Issue #13444: if stdout has been explicitly closed, we should

# not attempt to flush it at shutdown.

code = "import sys; sys.stdout.close()"

rc, out, err = assert_python_ok('-c', code)

self.assertEqual(b'', err)

# Issue #7111: Python should work without standard streams

@unittest.skipIf(os.name != 'posix', "test needs POSIX semantics")

def _test_no_stdio(self, streams):

code = """if 1:

import os, sys

for i, s in enumerate({streams}):

if getattr(sys, s) is not None:

os._exit(i + 1)

os._exit(42)""".format(streams=streams)

def preexec():

if 'stdin' in streams:

os.close(0)

if 'stdout' in streams:

os.close(1)

if 'stderr' in streams:

os.close(2)

p = subprocess.Popen(

[sys.executable, "-E", "-c", code],

stdin=subprocess.PIPE,

stdout=subprocess.PIPE,

stderr=subprocess.PIPE,

preexec_fn=preexec)

out, err = p.communicate()

self.assertEqual(support.strip_python_stderr(err), b'')

self.assertEqual(p.returncode, 42)

def test_no_stdin(self):

self._test_no_stdio(['stdin'])

def test_no_stdout(self):

self._test_no_stdio(['stdout'])

def test_no_stderr(self):

self._test_no_stdio(['stderr'])

def test_no_std_streams(self):

self._test_no_stdio(['stdin', 'stdout', 'stderr'])

def test_hash_randomization(self):

# Verify that -R enables hash randomization:

self.verify_valid_flag('-R')

hashes = []

if os.environ.get('PYTHONHASHSEED', 'random') != 'random':

env = dict(os.environ) # copy

# We need to test that it is enabled by default without

# the environment variable enabling it for us.

del env['PYTHONHASHSEED']

env['__cleanenv'] = '1' # consumed by assert_python_ok()

else:

env = {}

for i in range(3):

code = 'print(hash("spam"))'

rc, out, err = assert_python_ok('-c', code, **env)

self.assertEqual(rc, 0)

hashes.append(out)

hashes = sorted(set(hashes)) # uniq

# Rare chance of failure due to 3 random seeds honestly being equal.

self.assertGreater(len(hashes), 1,

msg='3 runs produced an identical random hash '

' for "spam": {}'.format(hashes))

# Verify that sys.flags contains hash_randomization

code = 'import sys; print("random is", sys.flags.hash_randomization)'

rc, out, err = assert_python_ok('-c', code, PYTHONHASHSEED='')

self.assertIn(b'random is 1', out)

rc, out, err = assert_python_ok('-c', code, PYTHONHASHSEED='random')

self.assertIn(b'random is 1', out)

rc, out, err = assert_python_ok('-c', code, PYTHONHASHSEED='0')

self.assertIn(b'random is 0', out)

rc, out, err = assert_python_ok('-R', '-c', code, PYTHONHASHSEED='0')

self.assertIn(b'random is 1', out)

def test_del___main__(self):

# Issue #15001: PyRun_SimpleFileExFlags() did crash because it kept a

# borrowed reference to the dict of __main__ module and later modify

# the dict whereas the module was destroyed

filename = support.TESTFN

self.addCleanup(support.unlink, filename)

with open(filename, "w") as script:

print("import sys", file=script)

print("del sys.modules['__main__']", file=script)

assert_python_ok(filename)

def test_unknown_options(self):

rc, out, err = assert_python_failure('-E', '-z')

self.assertIn(b'Unknown option: -z', err)

self.assertEqual(err.splitlines().count(b'Unknown option: -z'), 1)

self.assertEqual(b'', out)

# Add "without='-E'" to prevent _assert_python to append -E

# to env_vars and change the output of stderr

rc, out, err = assert_python_failure('-z', without='-E')

self.assertIn(b'Unknown option: -z', err)

self.assertEqual(err.splitlines().count(b'Unknown option: -z'), 1)

self.assertEqual(b'', out)

rc, out, err = assert_python_failure('-a', '-z', without='-E')

self.assertIn(b'Unknown option: -a', err)

# only the first unknown option is reported

self.assertNotIn(b'Unknown option: -z', err)

self.assertEqual(err.splitlines().count(b'Unknown option: -a'), 1)

self.assertEqual(b'', out)

@unittest.skipIf(interpreter_requires_environment(),

'Cannot run -I tests when PYTHON env vars are required.')

def test_isolatedmode(self):

self.verify_valid_flag('-I')

self.verify_valid_flag('-IEs')

rc, out, err = assert_python_ok('-I', '-c',

'from sys import flags as f; '

'print(f.no_user_site, f.ignore_environment, f.isolated)',

# dummyvar to prevent extraneous -E

dummyvar="")

self.assertEqual(out.strip(), b'1 1 1')

with support.temp_cwd() as tmpdir:

fake = os.path.join(tmpdir, "uuid.py")

main = os.path.join(tmpdir, "main.py")

with open(fake, "w") as f:

f.write("raise RuntimeError('isolated mode test')\n")

with open(main, "w") as f:

f.write("import uuid\n")

f.write("print('ok')\n")

self.assertRaises(subprocess.CalledProcessError,

subprocess.check_output,

[sys.executable, main], cwd=tmpdir,

stderr=subprocess.DEVNULL)

out = subprocess.check_output([sys.executable, "-I", main],

cwd=tmpdir)

self.assertEqual(out.strip(), b"ok")

def test_sys_flags_set(self):

# Issue 31845: a startup refactoring broke reading flags from env vars

for value, expected in (("", 0), ("1", 1), ("text", 1), ("2", 2)):

env_vars = dict(

PYTHONDEBUG=value,

PYTHONOPTIMIZE=value,

PYTHONDONTWRITEBYTECODE=value,

PYTHONVERBOSE=value,

)

code = (

"import sys; "

"sys.stderr.write(str(sys.flags)); "

f"""sys.exit(not (

sys.flags.debug == sys.flags.optimize ==

sys.flags.dont_write_bytecode == sys.flags.verbose ==

{expected}

))"""

)

with self.subTest(envar_value=value):

assert_python_ok('-c', code, **env_vars)

def test_set_pycache_prefix(self):

# sys.pycache_prefix can be set from either -X pycache_prefix or

# PYTHONPYCACHEPREFIX env var, with the former taking precedence.

NO_VALUE = object() # `-X pycache_prefix` with no `=PATH`

cases = [

# (PYTHONPYCACHEPREFIX, -X pycache_prefix, sys.pycache_prefix)

(None, None, None),

('foo', None, 'foo'),

(None, 'bar', 'bar'),

('foo', 'bar', 'bar'),

('foo', '', None),

('foo', NO_VALUE, None),

]

for envval, opt, expected in cases:

exp_clause = "is None" if expected is None else f'== "{expected}"'

code = f"import sys; sys.exit(not sys.pycache_prefix {exp_clause})"

args = ['-c', code]

env = {} if envval is None else {'PYTHONPYCACHEPREFIX': envval}

if opt is NO_VALUE:

args[:0] = ['-X', 'pycache_prefix']

elif opt is not None:

args[:0] = ['-X', f'pycache_prefix={opt}']

with self.subTest(envval=envval, opt=opt):

with support.temp_cwd():

assert_python_ok(*args, **env)

def run_xdev(self, *args, check_exitcode=True, xdev=True):

env = dict(os.environ)

env.pop('PYTHONWARNINGS', None)

env.pop('PYTHONDEVMODE', None)

# Force malloc() to disable the debug hooks which are enabled

# by default for Python compiled in debug mode

env['PYTHONMALLOC'] = 'malloc'

if xdev:

args = (sys.executable, '-X', 'dev', *args)

else:

args = (sys.executable, *args)

proc = subprocess.run(args,

stdout=subprocess.PIPE,

stderr=subprocess.STDOUT,

universal_newlines=True,

env=env)

if check_exitcode:

self.assertEqual(proc.returncode, 0, proc)

return proc.stdout.rstrip()

def test_xdev(self):

# sys.flags.dev_mode

code = "import sys; print(sys.flags.dev_mode)"

out = self.run_xdev("-c", code, xdev=False)

self.assertEqual(out, "False")

out = self.run_xdev("-c", code)

self.assertEqual(out, "True")

# Warnings

code = ("import warnings; "

"print(' '.join('%s::%s' % (f[0], f[2].__name__) "

"for f in warnings.filters))")

if Py_DEBUG:

expected_filters = "default::Warning"

else:

expected_filters = ("default::Warning "

"default::DeprecationWarning "

"ignore::DeprecationWarning "

"ignore::PendingDeprecationWarning "

"ignore::ImportWarning "

"ignore::ResourceWarning")

out = self.run_xdev("-c", code)

self.assertEqual(out, expected_filters)

out = self.run_xdev("-b", "-c", code)

self.assertEqual(out, f"default::BytesWarning {expected_filters}")

out = self.run_xdev("-bb", "-c", code)

self.assertEqual(out, f"error::BytesWarning {expected_filters}")

out = self.run_xdev("-Werror", "-c", code)

self.assertEqual(out, f"error::Warning {expected_filters}")

# Memory allocator debug hooks

try:

import _testcapi

except ImportError:

pass

else:

code = "import _testcapi; print(_testcapi.pymem_getallocatorsname())"

with support.SuppressCrashReport():

out = self.run_xdev("-c", code, check_exitcode=False)

if support.with_pymalloc():

alloc_name = "pymalloc_debug"

else:

alloc_name = "malloc_debug"

self.assertEqual(out, alloc_name)

# Faulthandler

try:

import faulthandler

except ImportError:

pass

else:

code = "import faulthandler; print(faulthandler.is_enabled())"

out = self.run_xdev("-c", code)

self.assertEqual(out, "True")

def check_warnings_filters(self, cmdline_option, envvar, use_pywarning=False):

if use_pywarning:

code = ("import sys; from test.support import import_fresh_module; "

"warnings = import_fresh_module('warnings', blocked=['_warnings']); ")

else:

code = "import sys, warnings; "

code += ("print(' '.join('%s::%s' % (f[0], f[2].__name__) "

"for f in warnings.filters))")

args = (sys.executable, '-W', cmdline_option, '-bb', '-c', code)

env = dict(os.environ)

env.pop('PYTHONDEVMODE', None)

env["PYTHONWARNINGS"] = envvar

proc = subprocess.run(args,

stdout=subprocess.PIPE,

stderr=subprocess.STDOUT,

universal_newlines=True,

env=env)

self.assertEqual(proc.returncode, 0, proc)

return proc.stdout.rstrip()

def test_warnings_filter_precedence(self):

expected_filters = ("error::BytesWarning "

"once::UserWarning "

"always::UserWarning")

if not Py_DEBUG:

expected_filters += (" "

"default::DeprecationWarning "

"ignore::DeprecationWarning "

"ignore::PendingDeprecationWarning "

"ignore::ImportWarning "

"ignore::ResourceWarning")

out = self.check_warnings_filters("once::UserWarning",

"always::UserWarning")

self.assertEqual(out, expected_filters)

out = self.check_warnings_filters("once::UserWarning",

"always::UserWarning",

use_pywarning=True)

self.assertEqual(out, expected_filters)

def check_pythonmalloc(self, env_var, name):

code = 'import _testcapi; print(_testcapi.pymem_getallocatorsname())'

env = dict(os.environ)

env.pop('PYTHONDEVMODE', None)

if env_var is not None:

env['PYTHONMALLOC'] = env_var

else:

env.pop('PYTHONMALLOC', None)

args = (sys.executable, '-c', code)

proc = subprocess.run(args,

stdout=subprocess.PIPE,

stderr=subprocess.STDOUT,

universal_newlines=True,

env=env)

self.assertEqual(proc.stdout.rstrip(), name)

self.assertEqual(proc.returncode, 0)

def test_pythonmalloc(self):

# Test the PYTHONMALLOC environment variable

pymalloc = support.with_pymalloc()

if pymalloc:

default_name = 'pymalloc_debug' if Py_DEBUG else 'pymalloc'

default_name_debug = 'pymalloc_debug'

else:

default_name = 'malloc_debug' if Py_DEBUG else 'malloc'

default_name_debug = 'malloc_debug'

tests = [

(None, default_name),

('debug', default_name_debug),

('malloc', 'malloc'),

('malloc_debug', 'malloc_debug'),

]

if pymalloc:

tests.extend((

('pymalloc', 'pymalloc'),

('pymalloc_debug', 'pymalloc_debug'),

))

for env_var, name in tests:

with self.subTest(env_var=env_var, name=name):

self.check_pythonmalloc(env_var, name)

def test_pythondevmode_env(self):

# Test the PYTHONDEVMODE environment variable

code = "import sys; print(sys.flags.dev_mode)"

env = dict(os.environ)

env.pop('PYTHONDEVMODE', None)

args = (sys.executable, '-c', code)

proc = subprocess.run(args, stdout=subprocess.PIPE,

universal_newlines=True, env=env)

self.assertEqual(proc.stdout.rstrip(), 'False')

self.assertEqual(proc.returncode, 0, proc)

env['PYTHONDEVMODE'] = '1'

proc = subprocess.run(args, stdout=subprocess.PIPE,

universal_newlines=True, env=env)

self.assertEqual(proc.stdout.rstrip(), 'True')

self.assertEqual(proc.returncode, 0, proc)

@unittest.skipUnless(sys.platform == 'win32',

'bpo-32457 only applies on Windows')

def test_argv0_normalization(self):

args = sys.executable, '-c', 'print(0)'

prefix, exe = os.path.split(sys.executable)

executable = prefix + '\\.\\.\\.\\' + exe

proc = subprocess.run(args, stdout=subprocess.PIPE,

executable=executable)

self.assertEqual(proc.returncode, 0, proc)

self.assertEqual(proc.stdout.strip(), b'0')

@unittest.skipIf(interpreter_requires_environment(),

'Cannot run -I tests when PYTHON env vars are required.')

class IgnoreEnvironmentTest(unittest.TestCase):

def run_ignoring_vars(self, predicate, **env_vars):

# Runs a subprocess with -E set, even though we're passing

# specific environment variables

# Logical inversion to match predicate check to a zero return

# code indicating success

code = "import sys; sys.stderr.write(str(sys.flags)); sys.exit(not ({}))".format(predicate)

return assert_python_ok('-E', '-c', code, **env_vars)

def test_ignore_PYTHONPATH(self):

path = "should_be_ignored"

self.run_ignoring_vars("'{}' not in sys.path".format(path),

PYTHONPATH=path)

def test_ignore_PYTHONHASHSEED(self):

self.run_ignoring_vars("sys.flags.hash_randomization == 1",

PYTHONHASHSEED="0")

def test_sys_flags_not_set(self):

# Issue 31845: a startup refactoring broke reading flags from env vars

expected_outcome = """

(sys.flags.debug == sys.flags.optimize ==

sys.flags.dont_write_bytecode == sys.flags.verbose == 0)

"""

self.run_ignoring_vars(

expected_outcome,

PYTHONDEBUG="1",

PYTHONOPTIMIZE="1",

PYTHONDONTWRITEBYTECODE="1",

PYTHONVERBOSE="1",

)

def test_main():

support.run_unittest(CmdLineTest, IgnoreEnvironmentTest)

support.reap_children()

if __name__ == "__main__":

test_main()

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