I have a directory with a number of .py files in it. each file defines some classes. I also have an empty __init__.py in the directory.

For example:

myproject __init__.py mymodule __init__.py api.py models.py views.py

I am trying to import mymodule and access the classes defined in all these files:

from myproject import mymodule print mymodule.api.MyClass

It gives me an error saying that mymodule has no attribute api. Why? And why I can access just one of the files (models.py) and not the others?

In [2]: dir(banners) Out[2]: ['__builtins__', '__doc__', '__file__', '__name__', '__package__', '__path__', 'models']

4 Answers

The problem is submodules are not automatically imported. You have to explicitly import the api module:

import myproject.mymodule.api print myproject.mymodule.api.MyClass

If you really insist on api being available when importing myproject.mymodule you can put this in myproject/mymodule/__init__.py:

import myproject.mymodule.api

Then this will work as expected:

from myproject import mymodule print mymodule.api.MyClass
3

If you are an idiot, like me, then also check whether you didn't name your python file the same as the module you are trying to import.

2

Modules don't work like that.

from myproject.mymodule import api print api.MyClass
4

You need an __init__.py in the myproject directory too. So your module structure should be:

myproject __init__.py mymodule __init__.py api.py models.py views.py
1