What this snippet does
Typed arrays enforce their type code; appending incompatible types raises a TypeError.
Expected output
'str' object cannot be interpreted as an integer
Why practise typing this
Typing standard library (array) 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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