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gh-153896: Deduplicate mutable args in `Literal` type by sobolevn · Pull Request #153913 · python/cpython · GitHub

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gh-153896: Deduplicate mutable args in Literal type #153913

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gh-153896: Deduplicate mutable args in Literal type #153913

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9 changes: 7 additions & 2 deletions Lib/test/test_typing.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2801,8 +2801,13 @@ def test_args(self):
self.assertEqual(Literal[1, 2, 3].__args__, (1, 2, 3))
self.assertEqual(Literal[1, 2, 3, 3].__args__, (1, 2, 3))
self.assertEqual(Literal[1, Literal[2], Literal[3, 4]].__args__, (1, 2, 3, 4))
# Mutable arguments will not be deduplicated
self.assertEqual(Literal[[], []].__args__, ([], []))
# Mutable arguments will also be deduplicated:
self.assertEqual(Literal[[], []].__args__, ([],))
self.assertEqual(
Literal[1, {'a': 'b'}, 2, {'a': 'b'}, 3].__args__,
(1, {'a': 'b'}, 2, 3),
)
self.assertEqual(Literal[{1}, {1}, {2}, {2}].__args__, ({1}, {2}))

def test_flatten(self):
l1 = Literal[Literal[1], Literal[2], Literal[3]]
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11 changes: 7 additions & 4 deletions Lib/typing.py
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Original file line number Diff line number Diff line change
Expand Up @@ -776,10 +776,13 @@ def open_helper(file: str, mode: MODE) -> str:
# values, not types.
parameters = _flatten_literal_params(parameters)

try:
parameters = tuple(p for p, _ in _deduplicate(list(_value_and_type_iter(parameters))))
except TypeError: # unhashable parameters
pass
parameters = tuple(
p
for p, _ in _deduplicate(
list(_value_and_type_iter(parameters)),
unhashable_fallback=True,
)
)

return _LiteralGenericAlias(self, parameters)

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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2026-07-18-13-32-04.gh-issue-153896.kj0wCj.rst
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@@ -0,0 +1 @@
Deduplicate mutable args in :data:`typing.Literal`.
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