go to submodule file in python file.

I hope Vim can improve "gf", "gD" for python submodule.
(press "gf" to open that submodule file, press "gD" to jump to that submodule file's global
definition)
for example, there is a piece of python code.

[code]
from canto_next.canto_backend import CantoBackend
[/code]

The file is like this:
bin/canto-daemon (I'm in this file.)
canto_next/
canto_backend.py

Do you have any idea for this ? (already have plugins or have some tips ?)

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