python - module has no attribute

76
votes

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
python

4 Answers

77
votes

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
10
votes

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.

0
votes

Modules don't work like that.

from myproject.mymodule import api
print api.MyClass
-1
votes

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