Mypy: Self-referencing types

[refi64]

There are some types that need to reference themselves. For instance:

class X():
    def some_func() -> X:
        ...

However, this is NOT valid Python 3 (X has not yet been fully declared at this point). Mypy should have a way for types to self-reference themselves (maybe a ThisType type?).

[gvanrossum]

The current convention is to put it in quotes, e.g.

  class X:
      def some_func(self) -> 'X':
          ...

[refi64]

@gvanrossum I wasn't aware of that. Whoops. Closing...