A password generator in python

genpass.py

import string
import sys

from random import choice


def __main__(*args, **kwargs):
    try:
        size = args[0][1]
        choiceable = string.letters*2 + string.digits*3 + string.punctuation
        print(''.join(choice(choiceable) for i in range(int(size))))
    except IndexError:
        print("You should give me at least the number of characteres in the password")
    except ValueError:
        print("You should give me a number smart-ass")


if __name__ == '__main__':
    __main__(sys.argv)