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import sys
import types
# Note: This test file can't import `unittest` since the runtime can't
# currently guarantee that it will not leak memory. Doing so will mark
# the test as passing but with reference leaks. This can safely import
# the `unittest` library once there's a strict guarantee of no leaks
# during runtime shutdown.
# bpo-46417: Test that structseq types used by the sys module are still
# valid when Py_Finalize()/Py_Initialize() are called multiple times.
class TestStructSeq:
# test PyTypeObject members
def _check_structseq(self, obj_type):
# ob_refcnt
assert sys.getrefcount(obj_type) > 1
# tp_base
assert issubclass(obj_type, tuple)
# tp_bases
assert obj_type.__bases__ == (tuple,)
# tp_dict
assert isinstance(obj_type.__dict__, types.MappingProxyType)
# tp_mro
assert obj_type.__mro__ == (obj_type, tuple, object)
# tp_name
assert isinstance(type.__name__, str)
# tp_subclasses
assert obj_type.__subclasses__() == []
def test_sys_attrs(self):
for attr_name in (
'flags', # FlagsType
'float_info', # FloatInfoType
'hash_info', # Hash_InfoType
'int_info', # Int_InfoType
'thread_info', # ThreadInfoType
'version_info', # VersionInfoType
):
attr = getattr(sys, attr_name)
self._check_structseq(type(attr))
def test_sys_funcs(self):
func_names = ['get_asyncgen_hooks'] # AsyncGenHooksType
if hasattr(sys, 'getwindowsversion'):
func_names.append('getwindowsversion') # WindowsVersionType
for func_name in func_names:
func = getattr(sys, func_name)
obj = func()
self._check_structseq(type(obj))
try:
tests = TestStructSeq()
tests.test_sys_attrs()
tests.test_sys_funcs()
except SystemExit as exc:
if exc.args[0] != 0:
raise
print("Tests passed")