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Update test_functools.py to 3.14.5 #7861

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Merged
youknowone merged 1 commit into from
May 12, 2026
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Update test_functools.py to 3.14.5 #7861

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52 changes: 52 additions & 0 deletions Lib/test/test_functools.py
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Original file line number Diff line number Diff line change
Expand Up @@ -514,6 +514,58 @@ def test_partial_genericalias(self):
self.assertEqual(alias.__args__, (int,))
self.assertEqual(alias.__parameters__, ())

# GH-144475: Tests that the partial object does not change until repr finishes
def test_repr_safety_against_reentrant_mutation(self):
g_partial = None

class Function:
def __init__(self, name):
self.name = name

def __call__(self):
return None

def __repr__(self):
return f"Function({self.name})"

class EvilObject:
def __init__(self):
self.triggered = False

def __repr__(self):
if not self.triggered and g_partial is not None:
self.triggered = True
new_args_tuple = (None,)
new_keywords_dict = {"keyword": None}
new_tuple_state = (Function("new_function"), new_args_tuple, new_keywords_dict, None)
g_partial.__setstate__(new_tuple_state)
gc.collect()
return f"EvilObject"

trigger = EvilObject()
func = Function("old_function")

g_partial = functools.partial(func, None, trigger=trigger)
self.assertEqual(repr(g_partial),"functools.partial(Function(old_function), None, trigger=EvilObject)")

trigger.triggered = False
g_partial = functools.partial(func, trigger, arg=None)
self.assertEqual(repr(g_partial),"functools.partial(Function(old_function), EvilObject, arg=None)")


trigger.triggered = False
g_partial = functools.partial(func, trigger, None)
self.assertEqual(repr(g_partial),"functools.partial(Function(old_function), EvilObject, None)")

trigger.triggered = False
g_partial = functools.partial(func, trigger=trigger, arg=None)
self.assertEqual(repr(g_partial),"functools.partial(Function(old_function), trigger=EvilObject, arg=None)")

trigger.triggered = False
g_partial = functools.partial(func, trigger, None, None, None, None, arg=None)
self.assertEqual(repr(g_partial),"functools.partial(Function(old_function), EvilObject, None, None, None, None, arg=None)")



@unittest.skipUnless(c_functools, 'requires the C _functools module')
class TestPartialC(TestPartial, unittest.TestCase):
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