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[3.9] Improve the error message for choices(population, 10) (GH-25267) #25477

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Merged
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Apr 20, 2021
Merged

[3.9] Improve the error message for choices(population, 10) (GH-25267) #25477

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10 changes: 9 additions & 1 deletion Lib/random.py
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Original file line number Diff line number Diff line change
Expand Up @@ -485,7 +485,15 @@ def choices(self, population, weights=None, *, cum_weights=None, k=1):
floor = _floor
n += 0.0 # convert to float for a small speed improvement
return [population[floor(random() * n)] for i in _repeat(None, k)]
cum_weights = list(_accumulate(weights))
try:
cum_weights = list(_accumulate(weights))
except TypeError:
if not isinstance(weights, int):
raise
k = weights
raise TypeError(
f'The number of choices must be a keyword argument: {k=}'
) from None
elif weights is not None:
raise TypeError('Cannot specify both weights and cumulative weights')
if len(cum_weights) != n:
Expand Down