Pytests import fails after renaming project folder

Question

I've been struggling for a while with renaming a project folder of a Python project. It was called Foo and I want it to rename it to Bar.

Foo/
   /src
        __init__.py
        x.py
   /test
        __init__.py
        x_test.py
   __init__.py

became

Bar/
   /src
        __init__.py
        x.py
   /test
        __init__.py
        x_test.py
    __init__.py

When the project folder was named Foo all my tests passed, but after renaming it to Bar my tests don't work anymore. All imports will raise an ImportError: no module src.x.

I can import the module when I'm using the python console:

$ python
>>> import src.x

When I then rename Bar back to Foo and run the test I'll get this error:

import file mismatch:
imported module 'test.x' has this __file__ attribute:
  /home/orangetux/projects/Foo/test/x_test.py
which is not the same as the test file we want to collect:
  /home/orangetux/projects/Bar/test/x_test.py
HINT: remove __pycache__ / .pyc files and/or use a unique basename for your test file modules

I can fix this by removing all __pycache__ folders. But now I'm back at the start. A folder named Foo with working test. How do I rename the project folder to Bar and keep working tests?

Answer 1

Delete the python cache (__pycache__) and all "compiled" files (ie: *.pyc, *.pyo).

Make sure that your __init.py__ files are not referring to any folder or path.