I'm using python 2.7.10 virtualenv when running python codes in IntelliJ. I need to install requests[security] package. However I'm not sure how to add that [security] option/config when installing requests package using the Package installer in File > Project Structure settings window.
Was able to install it by doing:

Activating the virtualenv in the 'Terminal' tool window:
source <virtualenv dir>/bin/activate
Executing a pip install requests[security]
How to Install requests[security] in virtualenv in IntelliJ