python import nested class

Question

I'm new to python. This is not my actual case, it's just my curiosity about importing nested class.

So I have a main.py and test.py.

test.py:

class one():
   class two():
      def twodef():
         pass

so in my main.py, I can do 'import test' or 'from test import one'. But I got error when do: 'from test.one import two'.

error : ImportError: No module named one

Anyone can explain this?

Answer 1

You can only do from module import name for names that exist in the module's global scope - basically, names that are defined in top-level module code. Names that are defined in lower-level scopes - for example within classes as in your example - are not importable. You need to import the object that contains the name, and access it from there.

from test import one
my_two = one.two()