I have recently started using PEP 484 and PEP 586 to make my code clearer and more accessible. So far everything was ok, but when I wanted to use Literal from the package typing it appears it couldn't be imported. What is the most surprising is that PyCharm isn't complaining at all for importing it or using it.

The code I want to use in the end is looking like that :

SomeVar = TypeVar("SomeVar", Literal['choice1'], Literal['choice2'], someType)

It would be used in the cases where you can have a string to describe what you want or an already made solution e.g :

def someFunc(my_var: SomeVar = 'choice1'):
    result = []
    if my_var == 'choice1':
        result.append(...)
    else:
        result = my_var
    return result

I use an Anaconda environment with Python 3.7.7.

As stated in the docs, typing.Literal is only available from Python 3.8 and up.