Fix attrs hashability detection when inheriting from mutable #17012
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Tinche
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@sobolevn Ready for review, if you have time! |
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According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅ |
Hnasar
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Mar 11, 2024
This commit fixes a couple regressions in 1.9.0 from 91be285. Attrs' logic for hashability is slightly complex: * https://www.attrs.org/en/stable/hashing.html * https://github.com/python-attrs/attrs/blob/9e443b18527dc96b194e92805fa751cbf8434ba9/src/attr/_make.py#L1660-L1689 Mypy now properly emulates attrs' logic so that custom `__hash__` implementations are preserved, `@frozen` subclasses are always hashable, and classes are only made unhashable based on the values of eq and `unsafe_hash`. Fixes python#17015 Fixes python#16556 (comment) Based on a patch in python#17012 Co-Authored-By: Tin Tvrtkovic <tinchester@gmail.com>
Hnasar
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Mar 11, 2024
This commit fixes a couple regressions in 1.9.0 from 91be285. Attrs' logic for hashability is slightly complex: * https://www.attrs.org/en/stable/hashing.html * https://github.com/python-attrs/attrs/blob/9e443b18527dc96b194e92805fa751cbf8434ba9/src/attr/_make.py#L1660-L1689 Mypy now properly emulates attrs' logic so that custom `__hash__` implementations are preserved, `@frozen` subclasses are always hashable, and classes are only made unhashable based on the values of eq and `unsafe_hash`. Fixes python#17015 Fixes python#16556 (comment) Based on a patch in python#17012 Co-Authored-By: Tin Tvrtkovic <tinchester@gmail.com>
Hnasar
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Mar 11, 2024
This commit fixes a couple regressions in 1.9.0 from 91be285. Attrs' logic for hashability is slightly complex: * https://www.attrs.org/en/stable/hashing.html * https://github.com/python-attrs/attrs/blob/9e443b18527dc96b194e92805fa751cbf8434ba9/src/attr/_make.py#L1660-L1689 Mypy now properly emulates attrs' logic so that custom `__hash__` implementations are preserved, `@frozen` subclasses are always hashable, and classes are only made unhashable based on the values of eq and `unsafe_hash`. Fixes python#17015 Fixes python#16556 (comment) Based on a patch in python#17012 Co-Authored-By: Tin Tvrtkovic <tinchester@gmail.com>
Hnasar
added a commit
to Hnasar/mypy
that referenced
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Mar 11, 2024
This commit fixes a couple regressions in 1.9.0 from 91be285. Attrs' logic for hashability is slightly complex: * https://www.attrs.org/en/stable/hashing.html * https://github.com/python-attrs/attrs/blob/9e443b18527dc96b194e92805fa751cbf8434ba9/src/attr/_make.py#L1660-L1689 Mypy now properly emulates attrs' logic so that custom `__hash__` implementations are preserved, `@frozen` subclasses are always hashable, and classes are only made unhashable based on the values of eq and `unsafe_hash`. Fixes python#17015 Fixes python#16556 (comment) Based on a patch in python#17012 Co-Authored-By: Tin Tvrtkovic <tinchester@gmail.com>
Hnasar
added a commit
to Hnasar/mypy
that referenced
this pull request
Mar 11, 2024
This commit fixes a couple regressions in 1.9.0 from 91be285. Attrs' logic for hashability is slightly complex: * https://www.attrs.org/en/stable/hashing.html * https://github.com/python-attrs/attrs/blob/9e443b18527dc96b194e92805fa751cbf8434ba9/src/attr/_make.py#L1660-L1689 Mypy now properly emulates attrs' logic so that custom `__hash__` implementations are preserved, `@frozen` subclasses are always hashable, and classes are only made unhashable based on the values of `eq` and `unsafe_hash`. Fixes python#17015 Fixes python#16556 (comment) Based on a patch in python#17012 Co-Authored-By: Tin Tvrtkovic <tinchester@gmail.com>
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Thanks for the quick fix @Tinche ! I was curious to learn myself how attrs handles this, so I ended up cloning your fix and testing it out, but realized that the logic didn't always accurately match attrs'. And also it didn't fix the regression I reported in #17015. So I reworked some of the subtle issues with this patch and added several other test cases here #17016 |
Hnasar
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Mar 12, 2024
This commit fixes a couple regressions in 1.9.0 from 91be285. Attrs' logic for hashability is slightly complex: * https://www.attrs.org/en/stable/hashing.html * https://github.com/python-attrs/attrs/blob/9e443b18527dc96b194e92805fa751cbf8434ba9/src/attr/_make.py#L1660-L1689 Mypy now properly emulates attrs' logic so that custom `__hash__` implementations are preserved, `@frozen` subclasses are always hashable, and classes are only made unhashable based on the values of `eq` and `unsafe_hash`. Fixes python#17015 Fixes python#16556 (comment) Based on a patch in python#17012 Co-Authored-By: Tin Tvrtkovic <tinchester@gmail.com>
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@Tinche can you please first decide which PR should be reviewed? :) |
JukkaL
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Mar 15, 2024
This commit fixes a couple regressions in 1.9.0 from 91be285. Attrs' logic for hashability is slightly complex: * https://www.attrs.org/en/stable/hashing.html * https://github.com/python-attrs/attrs/blob/9e443b18527dc96b194e92805fa751cbf8434ba9/src/attr/_make.py#L1660-L1689 Mypy now properly emulates attrs' logic so that custom `__hash__` implementations are preserved, `@frozen` subclasses are always hashable, and classes are only made unhashable based on the values of `eq` and `unsafe_hash`. Fixes #17015 Fixes #16556 (comment) Based on a patch in #17012 Co-Authored-By: Tin Tvrtkovic <tinchester@gmail.com> Co-authored-by: Hashem Nasarat <hashem@hudson-trading.com>
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Frozen attrs classes inheriting from mutable classes are hashable; fix this case and add a test.
Also support frozen classes with
hash=False(although I'm not sure this is a common use case at all, but it was easy to add).