pip install -U ALL_THE_THINGS

pip_upgrade_all.py

import pip
from subprocess import call

for dist in pip.get_installed_distributions():
	try:
		call("pip install --upgrade " + dist.project_name, shell=True)
	except Exception as e:
		print "Caught Exception: {error}".format(error=e)
		
print "Dunzo"

Can't find the SO post anymore…