import_thirdparty_module.py

import subprocess

def import_thirdparty_module(libname, importname=None):
    if not importname:
        importname = libname
    # http://stackoverflow.com/questions/25491541/python3-json-post-request-without-requests-library
    try:
        lib = __import__(importname)
    except ImportError:
        print("error: missing dependency '{libname}'\n"
              "to install, run: pip3 install {libname}\n"
              "would you like me to install it for you?\n"
              "I will be using the pip3 command located at:".format(libname=libname))
        subprocess.run("which pip", shell=True)
        yes_no = input("Install? [y/n] ")
        if yes_no.lower() in ["yes", "y"]:
            ret = subprocess.run("pip3 install {}".format(libname), shell=True)
            if ret.returncode == 0:
                print("install successful. please rerun your command")
            else:
                print("install unsuccessful")
        sys.exit()
    return lib

Example usage:

yaml = import_thirdparty_module('pyaml', 'yaml')
git = import_thirdparty_module('GitPython', 'git')
requests = import_thirdparty_module('requests')