try plac

try_plac.py

import plac
import random

@plac.annotations(name="your name")
def hello(name):
    "Greet you half of the time, and otherwise * you"
    if random.randint(0, 10) > 5:
        print "Hello %s" % name
    else:
        print "Screw you. I'm ... going ... home~"

if __name__ == '__main__':
    plac.call(hello)