python import statements

Question

I've started working on Python for about a month now and I've ran into something I would like to understand better. It's related to imports. So I have a module: root.core.connectivity

Now in this module I have defined a class Connectivity. This module also has a __main__ only for testing purposes(not sure if this makes any differences).

Now if I do:

from root.core.connectivity import Connectivity as class_name

This works fine, however if I try:

import root.core.connectivity.Connectivity as class_name

This will fail with:

ImportError: No module named Connectivity

So my question is, why does it fail and what are the differences between the two statements.

Regards, Bogdan

Answer 1

import takes a module. from X import Y takes a module in X, and any element of that module in Y. Connectivity is not a module.