What this snippet does
Callable annotations specify the signature of functions or methods expected as arguments.
Expected output
20
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
- Union TypesAdvanced Typing · intermediate
- Optional ReturnsAdvanced Typing · intermediate
- Pipe OperatorAdvanced Typing · intermediate
- TypeVarAdvanced Typing · intermediate
- Generic ClassAdvanced Typing · intermediate
- Runtime ErasureAdvanced Typing · intermediate