What this snippet does
Python 3.10+ allows the | operator for Unions, but using it in older versions raises TypeErrors.
Expected output
4
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.
More Python practice
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