Running modules as scripts

I need some help running modules as stand alone scripts. Let's assume I have the following folder layout:

• my_package
  • __init__.py
    • Workers
      • worker_monitor.py
      • worker_process.py
    • WorkersTest
      • __init__.py
      • worker_test.py
      • test_data.dat

In the following directory structure, worker_test.py is the unit test module for worker_monitor and worker_process. Now, I can execute worker_test.py fine from within PyCharm (PyCharm is totally awesome here!) I am struggling to run this test from the command line.

If I run the tests from WorkersTest/, I get the error  "ImportError: No module named my_package.Workers.worker_monitor". I'm assuming that PyCharm successfully runs the tests because it applies some magic to the paths.

I would like to know what magic is being applied? Thanks.