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PEP 483: fixes issue of getting wrong Error #2143

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Nov 14, 2021
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PEP 483: fixes issue of getting wrong Error #2143

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2 changes: 1 addition & 1 deletion pep-0483.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -486,7 +486,7 @@ replaced by the most-derived base class among ``t1``, etc. Examples:
Note that the type checker will reject this function::

def concat(first: U, second: U) -> U:
return x + y # Error: can't concatenate str and bytes
return first + second # Error: can't concatenate str and bytes

For such cases where parameters could change their types only simultaneously
one should use constrained type variables.
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