pip version

python -m pip install -U pip

sudo apt-get install python3-pip

python -m pip install <package>

#Download Selenium
python -m pip install selenium

pip --version

$ pip show Jinja2
---
Name: Jinja2
Version: 2.7.3
Location: /path/to/virtualenv/lib/python2.7/site-packages
Requires: markupsafe