auto.py

#!/usr/bin/env python
import importlib
import importlib.util

import pip


def install(name, version=None):
  args = [
    'install',
    name
  ]
  if version:
    args[1] = '%s==%s' % (args[1], version)
  pip.main(args)


def load(name, version=None, url=None):
  mod = importlib.util.find_spec(name)
  if mod:
    return importlib.import_module(name)
  if url is None:
    install(name, version)
  else:
    install(url)
  return importlib.import_module(name)


req = load('requests', version='2.14.0')
#req = load('requests', url='https://github.com/kennethreitz/requests/archive/master.zip')
#req = load('requests', url='git+https://github.com/kennethreitz/requests.git')
#req = load('requests', url='git+ssh://git@github.com/kennethreitz/requests.git')

print(req)