What this snippet does
A generator must be started with next() before send() can be used, else TypeError.
Expected output
TypeError: can't send non-None value to a just-started generator
Why practise typing this
Typing generators (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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