What this snippet does
Overloading 'in' provides an intuitive API for checking if custom collections contain an item.
Expected output
True
Why practise typing this
Typing magic methods (advanced) code builds muscle memory for the symbols and indentation Python uses most, which prose-based typing tests never cover. DevType measures your words per minute and accuracy on this snippet and tracks the individual characters you mistype, so later lessons can target them.
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