python - Change in python script not reflected when I execute module "behave"

Question

I am trying to use Behave from terminal. Typing behave in terminal, I received an error,

Exception ImportError: No module named worker

File "features/environment.py", line 11, in <module>

from worker import glob, json

ImportError: No module named worker

I have made the change in my environment.py document and removed the from worker import glob, json.

However when I execute behave, I receive the same error. I closed terminal, reopened it. I closed the text editor (Atom) and reopened it. The error persists. When I restarted the computer, it finally reflected the changes. I do not want to restart the computer every time to get behave to show the document changes.

Why is this happening and what can be done?