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Using __len__ with the old code returns "ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()". I believe that line 21 is trying to check if the list is None. If so, this is a better way.
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Using len with the old code returns "ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()". I believe that line 21 is trying to check if the list is None. If so, this is a better way.