How to display auto-tips on type typing.List[typing.Union] for any list item?

Question

Python

I need to make it so that when entering a dot, paycharm offers me methods not only related to dict, but also to str.
For example, to have both join() and items() in the tooltip

class A(BaseModel):
    items: List[dict] = Field(None)


class B(BaseModel):
    items: List[str] = Field(None)


class C(BaseModel):
    response: Union[A, B] = Field(None)


c = C(**{'response': {'items': [1, 2, 3]}})

Answer 1

You want weird.
Namely, for some reason you want to make code that is obviously unsafe, and at the same time you want the IDE to help you with this. This is what I mean: the case that you brought here is an anti-pattern; it would be strange to expect such a specific handling of this situation from the IDE.
In what, actually, a problem.
The method you call on an object should not depend on what data you have as input, otherwise your code becomes unsafe and with the same data set, an error is possible due to the absence of the called method.
Such things need to be parsed explicitly in the code.
For example, you can explicitly check the variable for belonging to a type and the IDE will take this into account when making a hint:

resp = c.response
if isinstance(resp, A):
    resp.items[0].