[SOLVED] Type annotation with multiple types in **kwargs

Type annotation with multiple types in **kwargs

I'm trying out using Python's type annotations with abstract class. My __init__ function looks like this:

from abc import ABCMeta

class SomeClass(object, metaclass=ABCMeta):
    def __init__(self, *args, **kwargs):
        print("Initiating %s object.", self.__class__.__name__)

        self.username = kwargs['data']
        assert isinstance(self.username, str)

        is_premioum = kwargs.get('premioum', False)

        self.money_investmant = kwargs.get('investmant')
        if isinstance(self.money_investmant, str):
            self.money_investmant = float(self.money_investmant)

As you can see, kwargs could contain arguments from a several number of types- float, bool and str.

Now, I am trying to write the type annotation for the function, that looks like this:

def __init__(self, *args, **kwargs: Union[bool, str, float]) -> None:

But my PyCharm IDE alerts me:

Except type 'Integral', got 'str' instead

And:

Cannot find referance 'get' in bool | str | float'

Am I doing something wrong?

How should I write the type annotation for kwargs if it contains arguments from multiple types?

Solution

See this bug and this bug on the issue tracker for PyCharm. This is apparently an issue with PyCharm's checker; mypy (another type checker for Python) does not complain when I execute similar code.

There's already a fix for this and, it's apparently available in build 171.2014.23. Until then, I'd suppose Any would suffice as a temporary workaround to get the checker to stop complaining.