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gh-40440: Add a timeout parameter to tkinter wait_variable() - #152619
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Without a timeout wait_variable() blocks forever if the variable is never set, for example because the window that would set it was destroyed. The new keyword-only timeout parameter bounds the wait and returns whether the variable was modified. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Misc.wait_variable()wraps the Tcltkwait variablecommand, which blocks until the variable is written — with no escape if that never happens (e.g. the application is torn down before the setter runs), so the call can hang forever.Add an optional keyword-only timeout argument (in seconds).
With a timeout the wait is reimplemented in Python on top of
tkapp.dooneevent()and a variable trace: it returnsTrueif the variable was modified, orFalseif the timeout elapsed first (or the application was destroyed while waiting).Without a timeout the behaviour is unchanged (the native
tkwaitcall, always returnsTrue).