For this code:
from typing import Union
def add(a: Union[float, int], b: Union[float, int]) -> float:
return a + b
The error I get is:
% mypy --version
mypy 0.620
% mypy foo.py
foo.py:4: error: Unsupported operand types for + ("Union[float, int]" and "Union[float, int]")
If I declare either parameter as just an int or a float (and leave the other parameter unchanged) then the error goes away.
According to the documentation, it seems that Union[float, int] should be equivalent to float. So the simple solution seems to be to declare both parameters as float, but I would expect mypy to figure this out.
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