Clarify Future.cancel() behavior - #154949
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The previous wording could be read as implying that a running call might still be cancellable. This change makes it explicit that
Future.cancel()returnsFalseonce the call is already running or has finished.This is a documentation-only change; no behavior is changed.
Discussed at:
https://discuss.python.org/t/docs-improvement-suggestion-an-ambiguity-in-the-future-cancel-for-non-native-english-speakers/108328