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

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

FYI on Fedora 27, I get:

>>> signal.NSIG
65
>>> set(range(0, signal.NSIG)) - signal.valid_signals()
{0, 33, 32}
>>> len(signal.valid_signals())
62
>>> min(signal.valid_signals())
<Signals.SIGHUP: 1>
>>> max(signal.valid_signals())
<Signals.SIGRTMAX: 64>

So signals 0, 32 and 33 are invalid, the first valid signal is 1 and the last is 64.

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nosy: +vstinner

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<https://bugs.python.org/issue33332>
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