Absolute imports don't work on deeply buried files in my folder

Question

I have the following folder structure:

/project
    __init__.py
    /module1
       __init__.py
       file1.py
    /module2
       __init__.py
       file2.py

In file1 if I write from module2 import file2 I get the error No module named 'module2'. How can I make python import in an absolute way starting from the root of the project?