[issue39094] Add a default to statistics.mean and related functions
STINNER Victor
report at bugs.python.org
Thu Dec 19 06:12:06 EST 2019
STINNER Victor <vstinner at python.org> added the comment:
> I've tried think of other solutions, such as a generic wrapper for such functions or a helper to check whether an iterable is empty, and they all turn out to be very clunky to use and un-Pythonic.
So the main use case would be to detect an empty iterable in an efficient fashion? Something like the following code?
sentinel = objet()
avg = mean(data, default=sentinel)
if avg is sentinel:
... # special code path
Why not adding a statistics.StatisticsError subclass for empty set (ex: StatisticsEmptyError)? Something like:
try:
avg = mean(data)
except statistics.StatisticsEmptyError:
... # special code path, ex: avg = default
Or is there another use case for the proposed default parameter?
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nosy: +vstinner
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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39094>
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