[issue33332] Expose valid signal set (sigfillset()): add signal.valid_signals()

[STINNER Victor]

Change by STINNER Victor <vstinner at redhat.com>:


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title: Expose valid signal set (sigfillset()) -> Expose valid signal set (sigfillset()): add signal.valid_signals()

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33332>
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