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Narrowing for comparisons against x.__class__ - #20642
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JukkaL merged 1 commit intoJan 26, 2026
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Diff from mypy_primer, showing the effect of this PR on open source code: beartype (https://github.com/beartype/beartype)
+ beartype/_util/hint/pep/utilpepsign.py:592: error: Unused "type: ignore" comment [unused-ignore]
black (https://github.com/psf/black)
+ src/blib2to3/pytree.py:84:9: error: Returning Any from function declared to return "bool" [no-any-return]
static-frame (https://github.com/static-frame/static-frame)
+ static_frame/core/util.py:2085: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/util.py:2087: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/util.py:2089: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/util.py:2095: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/util.py:2096: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/util.py:2186: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/util.py:2188: error: Unused "type: ignore" comment [unused-ignore]
- static_frame/core/util.py:2307: error: "Hashable" has no attribute "start" [attr-defined]
- static_frame/core/util.py:2307: note: Error code "attr-defined" not covered by "type: ignore" comment
- static_frame/core/util.py:2309: error: "Hashable" has no attribute "stop" [attr-defined]
- static_frame/core/util.py:2309: note: Error code "attr-defined" not covered by "type: ignore" comment
- static_frame/core/util.py:2310: error: "Hashable" has no attribute "stop" [attr-defined]
- static_frame/core/util.py:2310: note: Error code "attr-defined" not covered by "type: ignore" comment
- static_frame/core/util.py:2311: error: "Hashable" has no attribute "step" [attr-defined]
- static_frame/core/util.py:2311: note: Error code "attr-defined" not covered by "type: ignore" comment
- static_frame/core/util.py:2312: error: "Hashable" has no attribute "step" [attr-defined]
- static_frame/core/util.py:2312: note: Error code "attr-defined" not covered by "type: ignore" comment
+ static_frame/core/loc_map.py:157: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/loc_map.py:169: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/loc_map.py:171: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/loc_map.py:174: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/loc_map.py:176: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/loc_map.py:177: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/node_fill_value.py:126: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/container_util.py:1065: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/container_util.py:1526: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/container_util.py:1528: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/container_util.py:1541: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/type_blocks.py:491: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/type_blocks.py:492: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/type_blocks.py:2368: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/type_blocks.py:3343: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/type_blocks.py:3347: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/type_blocks.py:3348: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/type_blocks.py:3351: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/type_blocks.py:3352: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/type_blocks.py:3356: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/type_blocks.py:3358: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/type_blocks.py:3361: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/type_blocks.py:3366: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/index.py:228: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/index.py:231: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/index.py:332: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/index.py:419: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/index.py:458: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/index.py:459: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/index.py:482: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/index.py:1031: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/index.py:1088: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/index.py:1899: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/index_hierarchy.py:492: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/index_hierarchy.py:494: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/index_hierarchy.py:567: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/index_hierarchy.py:2177: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/index_auto.py:85: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/archive_npy.py:232: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/series.py:634: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/series.py:636: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/series.py:639: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/series.py:642: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/series.py:645: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/frame.py:1304: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/frame.py:1441: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/frame.py:3491: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/frame.py:3494: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/frame.py:3497: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/frame.py:3499: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/bus.py:524: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/bus.py:526: error: Unused "type: ignore" comment [unused-ignore]
+ static_frame/core/bus.py:528: error: Unused "type: ignore" comment [unused-ignore]
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The black case is covered by a test from #20603 |
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hauntsaninja
commented
Jan 24, 2026
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test-data/unit/check-narrowing.test
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| def bar(y: Any): | ||
| if y.__class__ == int: | ||
| reveal_type(y) # N: Revealed type is "Any" |
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There was a problem hiding this comment.
I think this Any will actually get fixed by #20643
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JukkaL
approved these changes
Jan 26, 2026
JukkaL
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I'm glad to see so many type ignores fixed! Thanks!
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