change module path in Python

Question

I have a project like that :

foo/
 | main.py
 | bar/
 | | __init__.py
 | | module1.py
 | | module2.py

And I import module1.py in main.py by import bar.module1. But I need rewrite bar's function and keep old code. So I change project like that:

foo/
| main.py
| bar/
| | __init__.py
| | oldbar/
| | | module1.py
| | | module2.py
| | | __init__.py
| | newbar/
| | | module1.py
| | | module2.py
| | | __init__.py

Now, I do not want to change main.py, and I still use import bar.module1 in main.py. Can I do it? add some code into bar/__init__.py?

• oleg: Do You mean from subbar import module1? (Be careful mind a cyclic import)
• wenz: oleg, I change my question, thank you

Answer 1

In foo/bar/__init__.py you can write:

from subbar import module1
from subbar import module2

this should allow you to use import bar.module1 from main.py

• rxdazn: works for me... tested with your updated version gist.github.com/rxdazn/5780497 (just updated gist a few seconds ago, reload it)
• wenz: Yes. if I use from bar import module1, it works. But, if I use import bar.module1, it does not work
• rxdazn: importing will execute __init__.py files in sub folders (see [docs.python.org/3/reference/… - The import system: regular packages). This means bar/__ini__.py will be executed once bar is imported. By using import bar.module1, bar/__init__.py is not loaded so it does not know bar/newbar/module1 exists. Either use from bar import module1 with module1.hello() or import bar with bar.module1.hello()
• wenz: Oh, I see. Is there any method to do it except adding code in __init__.py file?