ModuleNotFoundError: No module named 'rospkg'

[ElaineYao]

Hi,

I am following the instructions to install physical robots and simulations.
When running $CSW_PYTHON -m pytest, it gave me the following error:

E   ModuleNotFoundError: No module named 'rospkg'

/opt/ros/noetic/lib/python3/dist-packages/roslib/launcher.py:42: ModuleNotFoundError

I tried sudo apt-get install python3-rospkg but the error still exists.

[jpreiss]

you may have forgotten to source setup.bash.

[ElaineYao]

Solved. Referring to this

the most common reason I've seen missing system modules like this results from the use of a non-default Python interpreter.
Please run which python3 to determine where your interpreter lives. If it doesn't live at /usr/bin/python3, then you have two choices: