What this snippet does
In a frozen dataclass, standard assignment fails in __post_init__; use object.__setattr__ to bypass.
Expected output
10
Why practise typing this
Typing dataclasses (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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