If I keep calling len() on a very long list, am I wasting time, or does it keep an int count in the background?
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If I keep calling len() on a very long list, am I wasting time, or does it keep an int count in the background?
Don’t worry: Of course it saves the count and thus
len()on lists is a pretty cheap operation. Same is true for strings, dictionaries and sets, by the way!