About output "Julia types" from Python functions.

Hi!
I would like to know if it is correct that all the outputs of python functions have julia type` Py`.
Is it possible to specify more the type in such a way to use multiple dispatch depending on the python type?
If not, which is the correct way to assign a specific julia type instead of `Py`?
For example, I am referring to this [python class](http://gala.adrian.pw/en/latest/api/gala.coordinates.GreatCircleICRSFrame.html).
Thank you.

The issue names no repository files, tests, or entry points. Start by examining how PythonCall represents outputs from Python functions and the referenced gala.coordinates.GreatCircleICRSFrame class. Done means documenting whether Py is expected and how Julia dispatch or explicit type conversion should work.

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