cpython/Lib/test/test_sys.py at dbf5189bd9ef90873e8014e084c8d08b6bf83af9 · colesbury/cpython

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import builtins

import codecs

import _datetime

import gc

import locale

import operator

import os

import random

import struct

import subprocess

import sys

import sysconfig

import test.support

from test import support

from test.support import os_helper

from test.support.script_helper import assert_python_ok, assert_python_failure

from test.support import threading_helper

from test.support import import_helper

from test.support import force_not_colorized

try:

from test.support import interpreters

except ImportError:

interpreters = None

import textwrap

import unittest

import warnings

def requires_subinterpreters(meth):

"""Decorator to skip a test if subinterpreters are not supported."""

return unittest.skipIf(interpreters is None,

'subinterpreters required')(meth)

DICT_KEY_STRUCT_FORMAT = 'n2BI2n'

class DisplayHookTest(unittest.TestCase):

def test_original_displayhook(self):

dh = sys.__displayhook__

with support.captured_stdout() as out:

dh(42)

self.assertEqual(out.getvalue(), "42\n")

self.assertEqual(builtins._, 42)

del builtins._

with support.captured_stdout() as out:

dh(None)

self.assertEqual(out.getvalue(), "")

self.assertTrue(not hasattr(builtins, "_"))

# sys.displayhook() requires arguments

self.assertRaises(TypeError, dh)

stdout = sys.stdout

try:

del sys.stdout

self.assertRaises(RuntimeError, dh, 42)

finally:

sys.stdout = stdout

def test_lost_displayhook(self):

displayhook = sys.displayhook

try:

del sys.displayhook

code = compile("42", "<string>", "single")

self.assertRaises(RuntimeError, eval, code)

finally:

sys.displayhook = displayhook

def test_custom_displayhook(self):

def baddisplayhook(obj):

raise ValueError

with support.swap_attr(sys, 'displayhook', baddisplayhook):

code = compile("42", "<string>", "single")

self.assertRaises(ValueError, eval, code)

class ActiveExceptionTests(unittest.TestCase):

def test_exc_info_no_exception(self):

self.assertEqual(sys.exc_info(), (None, None, None))

def test_sys_exception_no_exception(self):

self.assertEqual(sys.exception(), None)

def test_exc_info_with_exception_instance(self):

def f():

raise ValueError(42)

try:

f()

except Exception as e_:

e = e_

exc_info = sys.exc_info()

self.assertIsInstance(e, ValueError)

self.assertIs(exc_info[0], ValueError)

self.assertIs(exc_info[1], e)

self.assertIs(exc_info[2], e.__traceback__)

def test_exc_info_with_exception_type(self):

def f():

raise ValueError

try:

f()

except Exception as e_:

e = e_

exc_info = sys.exc_info()

self.assertIsInstance(e, ValueError)

self.assertIs(exc_info[0], ValueError)

self.assertIs(exc_info[1], e)

self.assertIs(exc_info[2], e.__traceback__)

def test_sys_exception_with_exception_instance(self):

def f():

raise ValueError(42)

try:

f()

except Exception as e_:

e = e_

exc = sys.exception()

self.assertIsInstance(e, ValueError)

self.assertIs(exc, e)

def test_sys_exception_with_exception_type(self):

def f():

raise ValueError

try:

f()

except Exception as e_:

e = e_

exc = sys.exception()

self.assertIsInstance(e, ValueError)

self.assertIs(exc, e)

class ExceptHookTest(unittest.TestCase):

@force_not_colorized

def test_original_excepthook(self):

try:

raise ValueError(42)

except ValueError as exc:

with support.captured_stderr() as err:

sys.__excepthook__(*sys.exc_info())

self.assertTrue(err.getvalue().endswith("ValueError: 42\n"))

self.assertRaises(TypeError, sys.__excepthook__)

@force_not_colorized

def test_excepthook_bytes_filename(self):

# bpo-37467: sys.excepthook() must not crash if a filename

# is a bytes string

with warnings.catch_warnings():

warnings.simplefilter('ignore', BytesWarning)

try:

raise SyntaxError("msg", (b"bytes_filename", 123, 0, "text"))

except SyntaxError as exc:

with support.captured_stderr() as err:

sys.__excepthook__(*sys.exc_info())

err = err.getvalue()

self.assertIn(""" File "b'bytes_filename'", line 123\n""", err)

self.assertIn(""" text\n""", err)

self.assertTrue(err.endswith("SyntaxError: msg\n"))

def test_excepthook(self):

with test.support.captured_output("stderr") as stderr:

with test.support.catch_unraisable_exception():

sys.excepthook(1, '1', 1)

self.assertTrue("TypeError: print_exception(): Exception expected for " \

"value, str found" in stderr.getvalue())

# FIXME: testing the code for a lost or replaced excepthook in

# Python/pythonrun.c::PyErr_PrintEx() is tricky.

class SysModuleTest(unittest.TestCase):

def tearDown(self):

test.support.reap_children()

def test_exit(self):

# call with two arguments

self.assertRaises(TypeError, sys.exit, 42, 42)

# call without argument

with self.assertRaises(SystemExit) as cm:

sys.exit()

self.assertIsNone(cm.exception.code)

rc, out, err = assert_python_ok('-c', 'import sys; sys.exit()')

self.assertEqual(rc, 0)

self.assertEqual(out, b'')

self.assertEqual(err, b'')

# call with integer argument

with self.assertRaises(SystemExit) as cm:

sys.exit(42)

self.assertEqual(cm.exception.code, 42)

# call with tuple argument with one entry

# entry will be unpacked

with self.assertRaises(SystemExit) as cm:

sys.exit((42,))

self.assertEqual(cm.exception.code, 42)

# call with string argument

with self.assertRaises(SystemExit) as cm:

sys.exit("exit")

self.assertEqual(cm.exception.code, "exit")

# call with tuple argument with two entries

with self.assertRaises(SystemExit) as cm:

sys.exit((17, 23))

self.assertEqual(cm.exception.code, (17, 23))

# test that the exit machinery handles SystemExits properly

rc, out, err = assert_python_failure('-c', 'raise SystemExit(47)')

self.assertEqual(rc, 47)

self.assertEqual(out, b'')

self.assertEqual(err, b'')

def check_exit_message(code, expected, **env_vars):

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

self.assertEqual(rc, 1)

self.assertEqual(out, b'')

self.assertTrue(err.startswith(expected),

"%s doesn't start with %s" % (ascii(err), ascii(expected)))

# test that stderr buffer is flushed before the exit message is written

# into stderr

check_exit_message(

r'import sys; sys.stderr.write("unflushed,"); sys.exit("message")',

b"unflushed,message")

# test that the exit message is written with backslashreplace error

# handler to stderr

check_exit_message(

r'import sys; sys.exit("surrogates:\uDCFF")',

b"surrogates:\\udcff")

# test that the unicode message is encoded to the stderr encoding

# instead of the default encoding (utf8)

check_exit_message(

r'import sys; sys.exit("h\xe9")',

b"h\xe9", PYTHONIOENCODING='latin-1')

def test_getdefaultencoding(self):

self.assertRaises(TypeError, sys.getdefaultencoding, 42)

# can't check more than the type, as the user might have changed it

self.assertIsInstance(sys.getdefaultencoding(), str)

# testing sys.settrace() is done in test_sys_settrace.py

# testing sys.setprofile() is done in test_sys_setprofile.py

def test_switchinterval(self):

self.assertRaises(TypeError, sys.setswitchinterval)

self.assertRaises(TypeError, sys.setswitchinterval, "a")

self.assertRaises(ValueError, sys.setswitchinterval, -1.0)

self.assertRaises(ValueError, sys.setswitchinterval, 0.0)

orig = sys.getswitchinterval()

# sanity check

self.assertTrue(orig < 0.5, orig)

try:

for n in 0.00001, 0.05, 3.0, orig:

sys.setswitchinterval(n)

self.assertAlmostEqual(sys.getswitchinterval(), n)

finally:

sys.setswitchinterval(orig)

def test_getrecursionlimit(self):

limit = sys.getrecursionlimit()

self.assertIsInstance(limit, int)

self.assertGreater(limit, 1)

self.assertRaises(TypeError, sys.getrecursionlimit, 42)

def test_setrecursionlimit(self):

old_limit = sys.getrecursionlimit()

try:

sys.setrecursionlimit(10_005)

self.assertEqual(sys.getrecursionlimit(), 10_005)

self.assertRaises(TypeError, sys.setrecursionlimit)

self.assertRaises(ValueError, sys.setrecursionlimit, -42)

finally:

sys.setrecursionlimit(old_limit)

def test_recursionlimit_recovery(self):

if hasattr(sys, 'gettrace') and sys.gettrace():

self.skipTest('fatal error if run with a trace function')

old_limit = sys.getrecursionlimit()

def f():

f()

try:

for depth in (50, 75, 100, 250, 1000):

try:

sys.setrecursionlimit(depth)

except RecursionError:

# Issue #25274: The recursion limit is too low at the

# current recursion depth

continue

# Issue #5392: test stack overflow after hitting recursion

# limit twice

with self.assertRaises(RecursionError):

f()

with self.assertRaises(RecursionError):

f()

finally:

sys.setrecursionlimit(old_limit)

@test.support.cpython_only

def test_setrecursionlimit_to_depth(self):

# Issue #25274: Setting a low recursion limit must be blocked if the

# current recursion depth is already higher than limit.

old_limit = sys.getrecursionlimit()

try:

depth = support.get_recursion_depth()

with self.subTest(limit=sys.getrecursionlimit(), depth=depth):

# depth + 1 is OK

sys.setrecursionlimit(depth + 1)

# reset the limit to be able to call self.assertRaises()

# context manager

sys.setrecursionlimit(old_limit)

with self.assertRaises(RecursionError) as cm:

sys.setrecursionlimit(depth)

self.assertRegex(str(cm.exception),

"cannot set the recursion limit to [0-9]+ "

"at the recursion depth [0-9]+: "

"the limit is too low")

finally:

sys.setrecursionlimit(old_limit)

def test_getwindowsversion(self):

# Raise SkipTest if sys doesn't have getwindowsversion attribute

test.support.get_attribute(sys, "getwindowsversion")

v = sys.getwindowsversion()

self.assertEqual(len(v), 5)

self.assertIsInstance(v[0], int)

self.assertIsInstance(v[1], int)

self.assertIsInstance(v[2], int)

self.assertIsInstance(v[3], int)

self.assertIsInstance(v[4], str)

self.assertRaises(IndexError, operator.getitem, v, 5)

self.assertIsInstance(v.major, int)

self.assertIsInstance(v.minor, int)

self.assertIsInstance(v.build, int)

self.assertIsInstance(v.platform, int)

self.assertIsInstance(v.service_pack, str)

self.assertIsInstance(v.service_pack_minor, int)

self.assertIsInstance(v.service_pack_major, int)

self.assertIsInstance(v.suite_mask, int)

self.assertIsInstance(v.product_type, int)

self.assertEqual(v[0], v.major)

self.assertEqual(v[1], v.minor)

self.assertEqual(v[2], v.build)

self.assertEqual(v[3], v.platform)

self.assertEqual(v[4], v.service_pack)

# This is how platform.py calls it. Make sure tuple

# still has 5 elements

maj, min, buildno, plat, csd = sys.getwindowsversion()

def test_call_tracing(self):

self.assertRaises(TypeError, sys.call_tracing, type, 2)

@unittest.skipUnless(hasattr(sys, "setdlopenflags"),

'test needs sys.setdlopenflags()')

def test_dlopenflags(self):

self.assertTrue(hasattr(sys, "getdlopenflags"))

self.assertRaises(TypeError, sys.getdlopenflags, 42)

oldflags = sys.getdlopenflags()

self.assertRaises(TypeError, sys.setdlopenflags)

sys.setdlopenflags(oldflags+1)

self.assertEqual(sys.getdlopenflags(), oldflags+1)

sys.setdlopenflags(oldflags)

@test.support.refcount_test

def test_refcount(self):

# n here originally had to be a global in order for this test to pass

# while tracing with a python function. Tracing used to call

# PyFrame_FastToLocals, which would add a copy of any locals to the

# frame object, causing the ref count to increase by 2 instead of 1.

# While that no longer happens (due to PEP 667), this test case retains

# its original global-based implementation

# PEP 683's immortal objects also made this point moot, since the

# refcount for None doesn't change anyway. Maybe this test should be

# using a different constant value? (e.g. an integer)

global n

self.assertRaises(TypeError, sys.getrefcount)

c = sys.getrefcount(None)

n = None

# Singleton refcnts don't change

self.assertEqual(sys.getrefcount(None), c)

del n

self.assertEqual(sys.getrefcount(None), c)

if hasattr(sys, "gettotalrefcount"):

self.assertIsInstance(sys.gettotalrefcount(), int)

def test_getframe(self):

self.assertRaises(TypeError, sys._getframe, 42, 42)

self.assertRaises(ValueError, sys._getframe, 2000000000)

self.assertTrue(

SysModuleTest.test_getframe.__code__ \

is sys._getframe().f_code

)

def test_getframemodulename(self):

# Default depth gets ourselves

self.assertEqual(__name__, sys._getframemodulename())

self.assertEqual("unittest.case", sys._getframemodulename(1))

i = 0

f = sys._getframe(i)

while f:

self.assertEqual(

f.f_globals['__name__'],

sys._getframemodulename(i) or '__main__'

)

i += 1

f2 = f.f_back

try:

f = sys._getframe(i)

except ValueError:

break

self.assertIs(f, f2)

self.assertIsNone(sys._getframemodulename(i))

# sys._current_frames() is a CPython-only gimmick.

@threading_helper.reap_threads

@threading_helper.requires_working_threading()

def test_current_frames(self):

import threading

import traceback

# Spawn a thread that blocks at a known place. Then the main

# thread does sys._current_frames(), and verifies that the frames

# returned make sense.

entered_g = threading.Event()

leave_g = threading.Event()

thread_info = [] # the thread's id

def f123():

g456()

def g456():

thread_info.append(threading.get_ident())

entered_g.set()

leave_g.wait()

t = threading.Thread(target=f123)

t.start()

entered_g.wait()

try:

# At this point, t has finished its entered_g.set(), although it's

# impossible to guess whether it's still on that line or has moved on

# to its leave_g.wait().

self.assertEqual(len(thread_info), 1)

thread_id = thread_info[0]

d = sys._current_frames()

for tid in d:

self.assertIsInstance(tid, int)

self.assertGreater(tid, 0)

main_id = threading.get_ident()

self.assertIn(main_id, d)

self.assertIn(thread_id, d)

# Verify that the captured main-thread frame is _this_ frame.

frame = d.pop(main_id)

self.assertTrue(frame is sys._getframe())

# Verify that the captured thread frame is blocked in g456, called

# from f123. This is a little tricky, since various bits of

# threading.py are also in the thread's call stack.

frame = d.pop(thread_id)

stack = traceback.extract_stack(frame)

for i, (filename, lineno, funcname, sourceline) in enumerate(stack):

if funcname == "f123":

break

else:

self.fail("didn't find f123() on thread's call stack")

self.assertEqual(sourceline, "g456()")

# And the next record must be for g456().

filename, lineno, funcname, sourceline = stack[i+1]

self.assertEqual(funcname, "g456")

self.assertIn(sourceline, ["leave_g.wait()", "entered_g.set()"])

finally:

# Reap the spawned thread.

leave_g.set()

t.join()

@threading_helper.reap_threads

@threading_helper.requires_working_threading()

def test_current_exceptions(self):

import threading

import traceback

# Spawn a thread that blocks at a known place. Then the main

# thread does sys._current_frames(), and verifies that the frames

# returned make sense.

g_raised = threading.Event()

leave_g = threading.Event()

thread_info = [] # the thread's id

def f123():

g456()

def g456():

thread_info.append(threading.get_ident())

while True:

try:

raise ValueError("oops")

except ValueError:

g_raised.set()

if leave_g.wait(timeout=support.LONG_TIMEOUT):

break

t = threading.Thread(target=f123)

t.start()

g_raised.wait(timeout=support.LONG_TIMEOUT)

try:

self.assertEqual(len(thread_info), 1)

thread_id = thread_info[0]

d = sys._current_exceptions()

for tid in d:

self.assertIsInstance(tid, int)

self.assertGreater(tid, 0)

main_id = threading.get_ident()

self.assertIn(main_id, d)

self.assertIn(thread_id, d)

self.assertEqual(None, d.pop(main_id))

# Verify that the captured thread frame is blocked in g456, called

# from f123. This is a little tricky, since various bits of

# threading.py are also in the thread's call stack.

exc_value = d.pop(thread_id)

stack = traceback.extract_stack(exc_value.__traceback__.tb_frame)

for i, (filename, lineno, funcname, sourceline) in enumerate(stack):

if funcname == "f123":

break

else:

self.fail("didn't find f123() on thread's call stack")

self.assertEqual(sourceline, "g456()")

# And the next record must be for g456().

filename, lineno, funcname, sourceline = stack[i+1]

self.assertEqual(funcname, "g456")

self.assertTrue((sourceline.startswith("if leave_g.wait(") or

sourceline.startswith("g_raised.set()")))

finally:

# Reap the spawned thread.

leave_g.set()

t.join()

def test_attributes(self):

self.assertIsInstance(sys.api_version, int)

self.assertIsInstance(sys.argv, list)

for arg in sys.argv:

self.assertIsInstance(arg, str)

self.assertIsInstance(sys.orig_argv, list)

for arg in sys.orig_argv:

self.assertIsInstance(arg, str)

self.assertIn(sys.byteorder, ("little", "big"))

self.assertIsInstance(sys.builtin_module_names, tuple)

self.assertIsInstance(sys.copyright, str)

self.assertIsInstance(sys.exec_prefix, str)

self.assertIsInstance(sys.base_exec_prefix, str)

self.assertIsInstance(sys.executable, str)

self.assertEqual(len(sys.float_info), 11)

self.assertEqual(sys.float_info.radix, 2)

self.assertEqual(len(sys.int_info), 4)

self.assertTrue(sys.int_info.bits_per_digit % 5 == 0)

self.assertTrue(sys.int_info.sizeof_digit >= 1)

self.assertGreaterEqual(sys.int_info.default_max_str_digits, 500)

self.assertGreaterEqual(sys.int_info.str_digits_check_threshold, 100)

self.assertGreater(sys.int_info.default_max_str_digits,

sys.int_info.str_digits_check_threshold)

self.assertEqual(type(sys.int_info.bits_per_digit), int)

self.assertEqual(type(sys.int_info.sizeof_digit), int)

self.assertIsInstance(sys.int_info.default_max_str_digits, int)

self.assertIsInstance(sys.int_info.str_digits_check_threshold, int)

self.assertIsInstance(sys.hexversion, int)

self.assertEqual(len(sys.hash_info), 9)

self.assertLess(sys.hash_info.modulus, 2**sys.hash_info.width)

# sys.hash_info.modulus should be a prime; we do a quick

# probable primality test (doesn't exclude the possibility of

# a Carmichael number)

for x in range(1, 100):

self.assertEqual(

pow(x, sys.hash_info.modulus-1, sys.hash_info.modulus),

"sys.hash_info.modulus {} is a non-prime".format(

sys.hash_info.modulus)

)

self.assertIsInstance(sys.hash_info.inf, int)

self.assertIsInstance(sys.hash_info.nan, int)

self.assertIsInstance(sys.hash_info.imag, int)

algo = sysconfig.get_config_var("Py_HASH_ALGORITHM")

if sys.hash_info.algorithm in {"fnv", "siphash13", "siphash24"}:

self.assertIn(sys.hash_info.hash_bits, {32, 64})

self.assertIn(sys.hash_info.seed_bits, {32, 64, 128})

if algo == 1:

self.assertEqual(sys.hash_info.algorithm, "siphash24")

elif algo == 2:

self.assertEqual(sys.hash_info.algorithm, "fnv")

elif algo == 3:

self.assertEqual(sys.hash_info.algorithm, "siphash13")

else:

self.assertIn(sys.hash_info.algorithm, {"fnv", "siphash13", "siphash24"})

else:

# PY_HASH_EXTERNAL

self.assertEqual(algo, 0)

self.assertGreaterEqual(sys.hash_info.cutoff, 0)

self.assertLess(sys.hash_info.cutoff, 8)

self.assertIsInstance(sys.maxsize, int)

self.assertIsInstance(sys.maxunicode, int)

self.assertEqual(sys.maxunicode, 0x10FFFF)

self.assertIsInstance(sys.platform, str)

self.assertIsInstance(sys.prefix, str)

self.assertIsInstance(sys.base_prefix, str)

self.assertIsInstance(sys.platlibdir, str)

self.assertIsInstance(sys.version, str)

vi = sys.version_info

self.assertIsInstance(vi[:], tuple)

self.assertEqual(len(vi), 5)

self.assertIsInstance(vi[0], int)

self.assertIsInstance(vi[1], int)

self.assertIsInstance(vi[2], int)

self.assertIn(vi[3], ("alpha", "beta", "candidate", "final"))

self.assertIsInstance(vi[4], int)

self.assertIsInstance(vi.major, int)

self.assertIsInstance(vi.minor, int)

self.assertIsInstance(vi.micro, int)

self.assertIn(vi.releaselevel, ("alpha", "beta", "candidate", "final"))

self.assertIsInstance(vi.serial, int)

self.assertEqual(vi[0], vi.major)

self.assertEqual(vi[1], vi.minor)

self.assertEqual(vi[2], vi.micro)

self.assertEqual(vi[3], vi.releaselevel)

self.assertEqual(vi[4], vi.serial)

self.assertTrue(vi > (1,0,0))

self.assertIsInstance(sys.float_repr_style, str)

self.assertIn(sys.float_repr_style, ('short', 'legacy'))

if not sys.platform.startswith('win'):

self.assertIsInstance(sys.abiflags, str)

def test_thread_info(self):

info = sys.thread_info

self.assertEqual(len(info), 3)

self.assertIn(info.name, ('nt', 'pthread', 'pthread-stubs', 'solaris', None))

self.assertIn(info.lock, ('semaphore', 'mutex+cond', None))

if sys.platform.startswith(("linux", "android", "freebsd")):

self.assertEqual(info.name, "pthread")

elif sys.platform == "win32":

self.assertEqual(info.name, "nt")

elif sys.platform == "emscripten":

self.assertIn(info.name, {"pthread", "pthread-stubs"})

elif sys.platform == "wasi":

self.assertEqual(info.name, "pthread-stubs")

@unittest.skipUnless(support.is_emscripten, "only available on Emscripten")

def test_emscripten_info(self):

self.assertEqual(len(sys._emscripten_info), 4)

self.assertIsInstance(sys._emscripten_info.emscripten_version, tuple)

self.assertIsInstance(sys._emscripten_info.runtime, (str, type(None)))

self.assertIsInstance(sys._emscripten_info.pthreads, bool)

self.assertIsInstance(sys._emscripten_info.shared_memory, bool)

def test_43581(self):

# Can't use sys.stdout, as this is a StringIO object when

# the test runs under regrtest.

self.assertEqual(sys.__stdout__.encoding, sys.__stderr__.encoding)

def test_intern(self):

has_is_interned = (test.support.check_impl_detail(cpython=True)

or hasattr(sys, '_is_interned'))

self.assertRaises(TypeError, sys.intern)

self.assertRaises(TypeError, sys.intern, b'abc')

if has_is_interned:

self.assertRaises(TypeError, sys._is_interned)

self.assertRaises(TypeError, sys._is_interned, b'abc')

s = "never interned before" + str(random.randrange(0, 10**9))

self.assertTrue(sys.intern(s) is s)

if has_is_interned:

self.assertIs(sys._is_interned(s), True)

s2 = s.swapcase().swapcase()

if has_is_interned:

self.assertIs(sys._is_interned(s2), False)

self.assertTrue(sys.intern(s2) is s)

if has_is_interned:

self.assertIs(sys._is_interned(s2), False)

# Subclasses of string can't be interned, because they

# provide too much opportunity for insane things to happen.

# We don't want them in the interned dict and if they aren't

# actually interned, we don't want to create the appearance

# that they are by allowing intern() to succeed.

class S(str):

def __hash__(self):

return 123

self.assertRaises(TypeError, sys.intern, S("abc"))

if has_is_interned:

self.assertIs(sys._is_interned(S("abc")), False)

@support.cpython_only

@requires_subinterpreters

def test_subinterp_intern_dynamically_allocated(self):

# Implementation detail: Dynamically allocated strings

# are distinct between interpreters

s = "never interned before" + str(random.randrange(0, 10**9))

t = sys.intern(s)

self.assertIs(t, s)

interp = interpreters.create()

interp.exec(textwrap.dedent(f'''

import sys

# set `s`, avoid parser interning & constant folding

s = str({s.encode()!r}, 'utf-8')

t = sys.intern(s)

assert id(t) != {id(s)}, (id(t), {id(s)})

assert id(t) != {id(t)}, (id(t), {id(t)})

'''))

@support.cpython_only

@requires_subinterpreters

def test_subinterp_intern_statically_allocated(self):

# Implementation detail: Statically allocated strings are shared

# between interpreters.

# See Tools/build/generate_global_objects.py for the list

# of strings that are always statically allocated.

for s in ('__init__', 'CANCELLED', '<module>', 'utf-8',

'{{', '', '\n', '_', 'x', '\0', '\N{CEDILLA}', '\xff',

with self.subTest(s=s):

t = sys.intern(s)

interp = interpreters.create()

interp.exec(textwrap.dedent(f'''

import sys

# set `s`, avoid parser interning & constant folding

s = str({s.encode()!r}, 'utf-8')

t = sys.intern(s)

assert id(t) == {id(t)}, (id(t), {id(t)})

'''))

@support.cpython_only

@requires_subinterpreters

def test_subinterp_intern_singleton(self):

# Implementation detail: singletons are used for 0- and 1-character

# latin1 strings.

for s in '', '\n', '_', 'x', '\0', '\N{CEDILLA}', '\xff':

with self.subTest(s=s):

interp = interpreters.create()

interp.exec(textwrap.dedent(f'''

import sys

# set `s`, avoid parser interning & constant folding

s = str({s.encode()!r}, 'utf-8')

assert id(s) == {id(s)}

t = sys.intern(s)

'''))

self.assertTrue(sys._is_interned(s))

def test_sys_flags(self):

self.assertTrue(sys.flags)

attrs = ("debug",

"inspect", "interactive", "optimize",

"dont_write_bytecode", "no_user_site", "no_site",

"ignore_environment", "verbose", "bytes_warning", "quiet",

"hash_randomization", "isolated", "dev_mode", "utf8_mode",

"warn_default_encoding", "safe_path", "int_max_str_digits",

"gil")

attr_types = {

"dev_mode": bool,

"safe_path": bool,

"gil": (int, type(None)),

}

for attr in attrs:

self.assertTrue(hasattr(sys.flags, attr), attr)

expected_type = attr_types.get(attr, int)

self.assertIsInstance(getattr(sys.flags, attr), expected_type, attr)

self.assertTrue(repr(sys.flags))

self.assertEqual(len(sys.flags), len(attrs))

self.assertIn(sys.flags.utf8_mode, {0, 1, 2})

def assert_raise_on_new_sys_type(self, sys_attr):

# Users are intentionally prevented from creating new instances of

# sys.flags, sys.version_info, and sys.getwindowsversion.

arg = sys_attr

attr_type = type(sys_attr)

with self.assertRaises(TypeError):

attr_type(arg)

with self.assertRaises(TypeError):

attr_type.__new__(attr_type, arg)

def test_sys_flags_no_instantiation(self):

self.assert_raise_on_new_sys_type(sys.flags)

def test_sys_version_info_no_instantiation(self):

self.assert_raise_on_new_sys_type(sys.version_info)

def test_sys_getwindowsversion_no_instantiation(self):

# Skip if not being run on Windows.

test.support.get_attribute(sys, "getwindowsversion")

self.assert_raise_on_new_sys_type(sys.getwindowsversion())

@test.support.cpython_only

def test_clear_type_cache(self):

sys._clear_type_cache()

@force_not_colorized

@support.requires_subprocess()

def test_ioencoding(self):

env = dict(os.environ)

# Test character: cent sign, encoded as 0x4A (ASCII J) in CP424,

# not representable in ASCII.

env["PYTHONIOENCODING"] = "cp424"

p = subprocess.Popen([sys.executable, "-c", 'print(chr(0xa2))'],

stdout = subprocess.PIPE, env=env)

out = p.communicate()[0].strip()

expected = ("\xa2" + os.linesep).encode("cp424")

self.assertEqual(out, expected)

env["PYTHONIOENCODING"] = "ascii:replace"

p = subprocess.Popen([sys.executable, "-c", 'print(chr(0xa2))'],

stdout = subprocess.PIPE, env=env)

out = p.communicate()[0].strip()

self.assertEqual(out, b'?')

env["PYTHONIOENCODING"] = "ascii"

p = subprocess.Popen([sys.executable, "-c", 'print(chr(0xa2))'],

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

env=env)

out, err = p.communicate()

self.assertEqual(out, b'')

self.assertIn(b'UnicodeEncodeError:', err)

self.assertIn(rb"'\xa2'", err)

env["PYTHONIOENCODING"] = "ascii:"

p = subprocess.Popen([sys.executable, "-c", 'print(chr(0xa2))'],

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

env=env)

out, err = p.communicate()

self.assertEqual(out, b'')

self.assertIn(b'UnicodeEncodeError:', err)

self.assertIn(rb"'\xa2'", err)

env["PYTHONIOENCODING"] = ":surrogateescape"

p = subprocess.Popen([sys.executable, "-c", 'print(chr(0xdcbd))'],

stdout=subprocess.PIPE, env=env)

out = p.communicate()[0].strip()

self.assertEqual(out, b'\xbd')

@unittest.skipUnless(os_helper.FS_NONASCII,

'requires OS support of non-ASCII encodings')

@unittest.skipUnless(sys.getfilesystemencoding() == locale.getpreferredencoding(False),

'requires FS encoding to match locale')

@support.requires_subprocess()

def test_ioencoding_nonascii(self):

env = dict(os.environ)

env["PYTHONIOENCODING"] = ""

p = subprocess.Popen([sys.executable, "-c",

'print(%a)' % os_helper.FS_NONASCII],

stdout=subprocess.PIPE, env=env)

out = p.communicate()[0].strip()

self.assertEqual(out, os.fsencode(os_helper.FS_NONASCII))

@unittest.skipIf(sys.base_prefix != sys.prefix,

'Test is not venv-compatible')

@support.requires_subprocess()

def test_executable(self):

# sys.executable should be absolute

self.assertEqual(os.path.abspath(sys.executable), sys.executable)

# Issue #7774: Ensure that sys.executable is an empty string if argv[0]

# has been set to a non existent program name and Python is unable to

# retrieve the real program name

# For a normal installation, it should work without 'cwd'

# argument. For test runs in the build directory, see #7774.

python_dir = os.path.dirname(os.path.realpath(sys.executable))

p = subprocess.Popen(

["nonexistent", "-c",

'import sys; print(sys.executable.encode("ascii", "backslashreplace"))'],

executable=sys.executable, stdout=subprocess.PIPE, cwd=python_dir)

stdout = p.communicate()[0]

executable = stdout.strip().decode("ASCII")

p.wait()

self.assertIn(executable, ["b''", repr(sys.executable.encode("ascii", "backslashreplace"))])

def check_fsencoding(self, fs_encoding, expected=None):

self.assertIsNotNone(fs_encoding)

codecs.lookup(fs_encoding)

if expected:

self.assertEqual(fs_encoding, expected)

def test_getfilesystemencoding(self):

fs_encoding = sys.getfilesystemencoding()

if sys.platform == 'darwin':

expected = 'utf-8'

else:

expected = None

self.check_fsencoding(fs_encoding, expected)

def c_locale_get_error_handler(self, locale, isolated=False, encoding=None):

# Force the POSIX locale

env = os.environ.copy()

env["LC_ALL"] = locale

env["PYTHONCOERCECLOCALE"] = "0"

code = '\n'.join((

'import sys',

'def dump(name):',

' std = getattr(sys, name)',

' print("%s: %s" % (name, std.errors))',

'dump("stdin")',

'dump("stdout")',

'dump("stderr")',

))

args = [sys.executable, "-X", "utf8=0", "-c", code]

if isolated:

args.append("-I")

if encoding is not None:

env['PYTHONIOENCODING'] = encoding

else:

env.pop('PYTHONIOENCODING', None)

p = subprocess.Popen(args,

stdout=subprocess.PIPE,

stderr=subprocess.STDOUT,

env=env,

universal_newlines=True)

stdout, stderr = p.communicate()

return stdout

def check_locale_surrogateescape(self, locale):

out = self.c_locale_get_error_handler(locale, isolated=True)

self.assertEqual(out,

'stdin: surrogateescape\n'

'stdout: surrogateescape\n'

'stderr: backslashreplace\n')

# replace the default error handler

out = self.c_locale_get_error_handler(locale, encoding=':ignore')

self.assertEqual(out,

'stdin: ignore\n'

'stdout: ignore\n'

'stderr: backslashreplace\n')

# force the encoding

out = self.c_locale_get_error_handler(locale, encoding='iso8859-1')

self.assertEqual(out,

'stdin: strict\n'

'stdout: strict\n'

'stderr: backslashreplace\n')

out = self.c_locale_get_error_handler(locale, encoding='iso8859-1:')

self.assertEqual(out,

'stdin: strict\n'

'stdout: strict\n'

'stderr: backslashreplace\n')

# have no any effect

out = self.c_locale_get_error_handler(locale, encoding=':')

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