Exception handling not working.

[sp1rs]

from typing import Union

def post(path: str) -> Union[requests.models.Response, ManualException]
      try:
            return requests.post(path)
      except:  
            raise ManualException 


def call() -> List:
        try:
              resp = post('path')
        except ManualException:
               return []

        return resp.content

On running mypy

Item "ManualException" of "Union[Response, ManualException]" has no attribute "content"

Ideally mypy should not raise any error, because I am handling the case when exception is raised.

[JelleZijlstra]

Exceptions should not be included in the return type. Your post function should simply return requests.models.Response.

The Python type system doesn't provide a way to specify what exceptions may be raised from a function.

[sp1rs]

@JelleZijlstra There are lots of places where we raise exception. This is common practice. Any work around? In django codebase, raising exception is a common thing.

[JukkaL]

Mypy can't check that exceptions are correctly caught or annotated, so your best is to document them in a docstring or invent some custom way of annotating them (but that won't be checked by mypy).