[tkinter] Allow any return value for invalidcommand - #16252
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Akuli merged 2 commits intoAug 26, 2026
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Tk only evaluates the invalidcommand (invcmd) script when validatecommand returns false and ignores whatever it returns, so Callable[[], bool] was too strict and rejected ordinary callbacks that return None. Widen it to Callable[[], object] on all Entry, Spinbox, ttk.Entry, ttk.Combobox and ttk.Spinbox sites. validatecommand keeps Callable[[], bool] because Tk does use its result. Closes python#10578 Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉 |
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Closes #10578
Widen
invalidcommand/invcmdfromCallable[[], bool]toCallable[[], object]on allEntry,Spinbox,ttk.Entry,ttk.Comboboxandttk.Spinboxsites, as suggested in the issue;validatecommandis unchanged.Agent used: Claude Code