Programatically use pip

use_pip.py

# Pip is actually a python package!
import pip

# It's screwy and not really written to be used this way, but we still can
pip_install_cmd = pip.commands.InstallCommand()

# load up all the args you'd use after pip install and away we go!
args = ['--upgrade', '--user', 'requests']
pip_install_cmd.main(args)