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How does the in operator work in Python?

x in obj calls obj.__contains__(x) if defined, else iterates the object comparing each item, giving O(1) for sets/dicts but O(n) for lists.

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Understand the problem

contains and fallbacks.

incontains

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x in obj calls obj.contains(x) if defined, else iterates the object comparing each item, giving O(1) for sets/dicts but O(n) for lists.

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PYCustom __contains__ and the generator-drain gotcha

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