no module named gevent even though it is installed

Question

OS : Ubuntu 16.04 Python 2.7

pip list | grep gev
DEPRECATION: The default format will switch to columns in the future. You can use --format=(legacy|columns)         


        

Answer 1

Working in a Python virtual environment in Ubuntu 16.04 I got the following results:

$ python -m pip install gevent 
Requirement already satisfied: gevent in ./lib/python2.7/site-packages  
Requirement already satisfied: greenlet>=0.4.10 in ./lib/python2.7/site-packages (from gevent)

import gevent worked successfully in my Python virtual environment, but it did not work outside of my Python virtual environment until I ran the following command:

sudo apt install python-gevent # also works in all currently supported versions of Ubuntu 

Description: gevent is a coroutine-based Python networking library. gevent uses greenlet to provide a high-level synchronous API on top of libevent event loop.