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Unioned types should be hashable: not documented? #112281
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PEPs https://peps.python.org/pep-0593/#specification and https://peps.python.org/pep-0604/ do not say anything about requirement of items to be hashable. I think that this is a bug: unhashable items must be allowed. I think that we need to rework our Thanks for the report! 👍 |
This is more complex than I initially thought, because Line 1536 in ce1096f
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Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
…ythonGH-112283) (cherry picked from commit a7549b0) Co-authored-by: Nikita Sobolev <mail@sobolevn.me> Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
…adata (pythonGH-112283) (cherry picked from commit a7549b0) Co-authored-by: Nikita Sobolev <mail@sobolevn.me> Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
…ython#112283) Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
…ython#112283) Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
…ython#112283) Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
Documentation
It seems that
typing.Union[X, Y]
as well asX | Y
type hints requireX
andY
to be hashable.This is not documented as far as I can see.
Considering this example:
This fails when unioned:
Should this be documented say here: https://docs.python.org/3/library/typing.html?highlight=typing#typing.Annotated ?
And examples here should use frozen dataclasses: https://docs.python.org/3/library/typing.html?highlight=typing#typing.Annotated ?
Linked PRs
Union
with unhashableAnnotated
metadata #112283Union
with unhashableAnnotated
metadata (GH-112283) #116213Union
with unhashableAnnotated
metadata (GH-112283) #116288The text was updated successfully, but these errors were encountered: