Fix tkinter.OptionMenu callback type - #16113
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srittau
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Jul 31, 2026
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Thanks, just a note about tests.
| root.after(1000, foo, 10, "lol") | ||
| root.after(1000, foo, 10, 10) # type: ignore | ||
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| tkinter.OptionMenu(root, tkinter.StringVar(), "option", command=lambda value: assert_type(value, str)) |
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Since our tests are never run, they are only checked against type checkers, this test doesn't do much. We try to keep our tests minimal, so this isn't needed.
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According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉 |
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OptionMenupasses the selected menu value to_setit, which invokes the callback with that value rather than theStringVar. Update both version-specific signatures to type the callback argumentas
str, and add a regression test for callback inference.CPython implementation: https://github.com/python/cpython/blob/main/Lib/tkinter/__init__.py#L4573-L4615
Fixes #16111