I wanted to try the command: pythonpath=. ./bin/ryu-manager ryu/app/simple_switch.py in ryu controller and this is the error message i got :
Traceback (most recent call last):
File "./bin/ryu-manager", line 18, in <module>
from ryu.cmd.manager import main
ImportError: No module named ryu.cmd.manager
I am using Ubuntu 18.04.4 LTS, python 2.7.17 and ryu 4.34