Type annotation with multiple types in **kwargs

Question

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?

Answer 1

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.