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gh-92261: Disallow iteration of Union (and other _SpecialForms) #92262

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Merged
serhiy-storchaka merged 10 commits into from
May 8, 2022
Merged

gh-92261: Disallow iteration of Union (and other _SpecialForms) #92262

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83ba140
Disallow iteration of Union
mrahtz May 3, 2022
9cb69ca
📜🤖 Added by blurb_it.
blurb-it[bot] May 3, 2022
42b2a56
Add test for isinstance(Iterable)
mrahtz May 7, 2022
6d6d4ff
Switch to __iter__ = None
mrahtz May 7, 2022
207a0f6
Test the specific error message
mrahtz May 7, 2022
70d5c09
Add tests for and fix iteration of Any, List, Callable, Tuple, and An…
mrahtz May 7, 2022
5cd84fc
Merge branch 'main' into disallow-union-iteration
mrahtz May 7, 2022
a9eaa18
Make the error message that we test for less specific
mrahtz May 7, 2022
b82c9e0
Add tests for list(list) and list(tuple)
mrahtz May 7, 2022
64f22fb
Use existing import of Iterable
mrahtz May 7, 2022
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Add test for isinstance(Iterable)
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@mrahtz
mrahtz committed May 7, 2022
commit 42b2a56674aaec4f2f72d5d7028a9e961112d345
3 changes: 3 additions & 0 deletions Lib/test/test_typing.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1491,6 +1491,9 @@ def test_cannot_iterate(self):
for _ in Union:
pass

def test_is_not_instance_of_iterable(self):
self.assertNotIsInstance(Union, collections.abc.Iterable)

def test_union_generalization(self):
self.assertFalse(Union[str, typing.Iterable[int]] == str)
self.assertFalse(Union[str, typing.Iterable[int]] == typing.Iterable[int])
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