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Fix unhashable-member crash when lambda used as a dict key #7454

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Sep 12, 2022
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Fix unhashable-member crash when lambda used as a dict key #7454

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7091f27
Fix ``unhashable-member`` crash when ``lambda`` used as a dict key
jacobtylerwalls Sep 11, 2022
a2450c6
fixup! Fix ``unhashable-member`` crash
jacobtylerwalls Sep 11, 2022
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3 changes: 3 additions & 0 deletions doc/whatsnew/fragments/7453.bugfix
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Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
Fixed a crash in the ``unhashable-member`` checker when using a ``lambda`` as a dict key.

Closes #7453
2 changes: 2 additions & 0 deletions pylint/checkers/utils.py
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Expand Up @@ -1950,6 +1950,8 @@ def is_hashable(node: nodes.NodeNG) -> bool:
for inferred in node.infer():
if inferred is astroid.Uninferable:
return True
if not hasattr(inferred, "igetattr"):
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mypy will complain about this when we add py.typed to astroid, but that is a problem to fix then I think.

return True
hash_fn = next(inferred.igetattr("__hash__"))
if hash_fn.parent is inferred:
return True
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1 change: 1 addition & 0 deletions tests/functional/u/unhashable_member.py
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Expand Up @@ -21,3 +21,4 @@ class Unhashable:
{[1, 2, 3]} # [unhashable-member]
{"tomato": "tomahto"}
{dict: {}}
{lambda x: x: "tomato"} # pylint: disable=unnecessary-lambda