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Update test_itertools.py from 3.14.4 #7618

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Merged
youknowone merged 1 commit into from
Apr 17, 2026
Merged

Update test_itertools.py from 3.14.4 #7618

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54 changes: 54 additions & 0 deletions Lib/test/test_itertools.py
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Original file line number Diff line number Diff line change
Expand Up @@ -734,6 +734,60 @@ def keyfunc(obj):
keyfunc.skip = 1
self.assertRaises(ExpectedError, gulp, [None, None], keyfunc)

def test_groupby_reentrant_eq_does_not_crash(self):
# regression test for gh-143543
class Key:
def __init__(self, do_advance):
self.do_advance = do_advance

def __eq__(self, other):
if self.do_advance:
self.do_advance = False
next(g)
return NotImplemented
return False

def keys():
yield Key(True)
yield Key(False)

g = itertools.groupby([None, None], keys().send)
next(g)
next(g) # must pass with address sanitizer

@unittest.expectedFailure # TODO: RUSTPYTHON; AssertionError: 4 != 1
def test_grouper_reentrant_eq_does_not_crash(self):
# regression test for gh-146613
grouper_iter = None

class Key:
__hash__ = None

def __init__(self, do_advance):
self.do_advance = do_advance

def __eq__(self, other):
nonlocal grouper_iter
if self.do_advance:
self.do_advance = False
if grouper_iter is not None:
try:
next(grouper_iter)
except StopIteration:
pass
return NotImplemented
return True

def keyfunc(element):
if element == 0:
return Key(do_advance=True)
return Key(do_advance=False)

g = itertools.groupby(range(4), keyfunc)
key, grouper_iter = next(g)
items = list(grouper_iter)
self.assertEqual(len(items), 1)

def test_filter(self):
self.assertEqual(list(filter(isEven, range(6))), [0,2,4])
self.assertEqual(list(filter(None, [0,1,0,2,0])), [1,2])
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