How can I split a module into multiple files, without breaking a backwards compatibly?

Question

Let's say I have a model.py file that looks like this:

class Foo():   ..  class Bar():   .. 

From other modules I'm importing the model and then using model.Foo() whenever I want to refer to them.

import model  foo = model.Foo() 

As this file is growing bigger I would like to split each class into multiple files, but without breaking the backwards compatibility if possible.

My idea was to break it like this:

model ├── __init__.py ├── foo.py └── bar.py 

but by doing that I will have to refer to them as model.foo.Foo().

So my question is: is it possible to split it in multiple files somehow but still referring to them as model.Foo()?

I should also be able to extend or use Foo inside Bar.

Answer 1

Sure you can, just import the classes in the __init__.py:

# in __init__.py from model.foo import Foo from model.bar import Bar 

And then when you wish to use them you can:

>>> import model >>> model.Bar() <model.bar.Bar object at 0x31306d0> 

or

>>> from model import Foo >>> Foo() <model.foo.Foo object at 0x31307d0>