Same code not working in PyCharm but working outside PyCharm

I am trying to run a google ortools example in PyCharm and got the following errors:

/Users/edamame/project/ortools/simple_program.py
Traceback (most recent call last):
  File "/Users/edamame/project/ortools/simple_program.py", line 3, in <module>
    from ortools.linear_solver import pywraplp
ModuleNotFoundError: No module named 'ortools.linear_solver'

Process finished with exit code 1

However, if I run the same code outside the PyCharm (under the corresponding project venv), it works fine:

(venv) edamame$ pwd
/Users/edamame/project/ortools/
(venv) edamame$ python simple_program.py 
Solution:
Objective value =  4.0
x =  1.0
y =  1.0

I then tried to print below in both cases:

import sys
print('\n'.join(sys.path))

The outputs:

In PyCharm:

/Users/edamame/project/venv/bin/python
/Users/edamame/project/ortools/so_example.py
/Users/edamame/project/ortools
/Users/edamame/project
/Library/Frameworks/Python.framework/Versions/3.6/lib/python36.zip
/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6
/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/lib-dynload
/Users/edamame/project/venv/lib/python3.6/site-packages
/Users/edamame/project/venv/lib/python3.6/site-packages/setuptools-39.1.0-py3.6.egg
/Users/edamame/project/venv/lib/python3.6/site-packages/pip-10.0.1-py3.6.egg

Outside PyCharm:

(venv) edamame$ python so_example.py 
/Users/edamame/project/ortools
/Library/Frameworks/Python.framework/Versions/3.6/lib/python36.zip
/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6
/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/lib-dynload
/Users/edamame/project/venv/lib/python3.6/site-packages
/Users/edamame/project/venv/lib/python3.6/site-packages/setuptools-39.1.0-py3.6.egg
/Users/edamame/project/venv/lib/python3.6/site-packages/pip-10.0.1-py3.6.egg

They seem to be the same though ... not sure what could be the problem ...

How do I make the same code working in PyCharm?

Solution

You have a namespace collision between custom ortools package and the installed one. PyCharm adds the project root (/Users/edamame/project) to PYTHONPATH by default and it causes the problem.

Either rename your custom ortools package or disable Add content roots to PYTHONPATH option in the dedicated Run Configuration in PYCharm.