How to fix "ImportError: No module named ..." error in Python?

Python does not add the current directory to sys.path, but rather the directory that the script is in. Add /home/bodacydo/work/project to either sys.path or $PYTHONPATH.

Here is a step-by-step solution:

1. Add a script called run.py in /home/bodacydo/work/project and edit it like this:

   import programs.my_python_program
   programs.my_python_program.main()
   

   (replace main() with your equivalent method in my_python_program.)

2. Go to /home/bodacydo/work/project
3. Run run.py

Explanation: Since python appends to PYTHONPATH the path of the script from which it runs, running run.py will append /home/bodacydo/work/project. And voilà, import foo.tasks will be found.

Do you have a file called __init__.py in the foo directory? If not then python won't recognise foo as a python package.

See the section on packages in the python tutorial for more information.

A better fix than setting PYTHONPATH is to use python -m module.path

This will correctly set sys.path[0] and is a more reliable way to execute modules.

I have a quick writeup about this problem, as other answerers have mentioned the reason for this is python path/to/file.py puts path/to on the beginning of the PYTHONPATH (sys.path).