New submission from Iza Romanowska <[email protected]>:
Hi,
When zero weights are given, the last element of a sequence is always chosen.
Example:
hits= []
for i in range(100):
hits.append(random.choices(["A","B","C","D"], [0, 0, 0, 0])[0])
print (set(hits))
>> {'D'}
I guess that most users would expect that in case of zero weights it will
default into a random.choice behaviour and select one option at random since
this is what happens in cases when all weights are equal. Alternatively, it
should return an empty array if the assumption was that all choices have a zero
probability of being selected. Either way, if it is consistently choosing one
option, this may be potentially difficult to spot in situations when a sequence
of weights all equal to zero only happen sporadically.
----------
components: Library (Lib)
messages: 357185
nosy: IRomanowska
priority: normal
severity: normal
status: open
title: unexpected behaviour of random.choices with zero weights
type: behavior
versions: Python 3.7
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Python tracker <[email protected]>
<https://bugs.python.org/issue38881>
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