Move error test to function that needs it. Improve error message. #30008
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Update to 15 March
rhettinger
added
type-feature
llimeht
reviewed
Dec 6, 2022
| def choice(self, seq): | ||
| """Choose a random element from a non-empty sequence.""" | ||
| # raises IndexError if seq is empty | ||
| if not seq: |
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@rhettinger : This change prevents operation on numpy arrays: if not seq will produce a ValueError (ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()). While it might be perverse to use random from stdlib on a numpy array, such code exists in the wild, such as in the test suite of scikit-learn which this change then breaks. Perhaps the test is better seq is None or len(seq) == 0, since that's what is actually needed for the next line about an empty sequence?
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Besides improving the error message and using clear code instead of a comment, this makes shuffle(), sample(), and randrange() slightly faster.