How can I fix the module import error when I run it on the command line after making SSH connection?

Question

I am not working on lego mindstorm project using ev3-brick and successfully connected pc and ev3-brick using Pycharm and then transferred the code from my laptop to EV3-brick. But whenever I try to implement the python file on SSH shell using terminal, the module import error occurs that no module named 'libs'. But since I transferred all the file and even set the path using export PYTHONPATH="${PYTHONPATH}:/home/robot/csse120/libs", it has to import all the modules. It seems that when I ran another file not using terminal, it correctly imports other modules or packages but whenever I run on the shell, it cannot find files on other packages. I even tried inserting following code which is, import os os.environ['PATH'] += ':/home/robot/csse120/libs' but it didn't work also in another file, it says it cannot import paho-mqtt thought it worked well when I didn't run it on the shell.

Can you help me solve this problem? I would appreciate your help.

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