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Copy pathtest_sys.py
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1884 lines (1659 loc) · 71.4 KB
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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),
1,
"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")
for attr in attrs:
self.assertTrue(hasattr(sys.flags, attr), attr)
attr_type = bool if attr in ("dev_mode", "safe_path") else int
self.assertEqual(type(getattr(sys.flags, attr)), attr_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=':')
self.assertEqual(out,
'stdin: surrogateescape\n'
'stdout: surrogateescape\n'
'stderr: backslashreplace\n')
out = self.c_locale_get_error_handler(locale, encoding='')
self.assertEqual(out,