Python type hinting without cyclic imports

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I’m trying to split my huge class into two; well, basically into the “main” class and a mixin with additional functions, like so:

main.py file:

import mymixin.py

class Main(object, MyMixin):
    def func1(self, xxx):
        ...

mymixin.py file:

class MyMixin(object):
    def func2(self: Main, xxx):  # <--- note the type hint
        ...

Now, while this works just fine, the type hint in MyMixin.func2 of course can’t work. I can’t import main.py, because I’d get a cyclic import and without the hint, my editor (PyCharm) can’t tell what self is.

I’m using Python 3.4, but I’m willing to move to 3.5 if a solution is available there.

Is there any way I can split my class into two files and keep all the “connections” so that my IDE still offers me auto-completion and all the other goodies that come from it knowing the types?

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