What this snippet does
Because __slots__ removes __dict__, attempting to set an unlisted attribute raises AttributeError.
Expected output
AttributeError: 'C' object has no attribute 'y'
Why practise typing this
Typing advanced concepts 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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