What this snippet does
Mypy will flag adding unknown keys to a TypedDict, but at runtime it behaves like a normal dict.
Expected output
{'x': 1, 'y': 2, 'z': 3}Why practise typing this
Typing advanced typing 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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