#!/usr/bin/env python3

import random, sys

alnum_chars = list(filter(lambda c: c.isalnum(), map(chr, range(128))))
full_chars = alnum_chars * 2 + list("!@#%^&*(){}[]/=?+_-;:,.<>")

def generate(chars, length):
    return "".join([random.choice(chars) for i in range(length)])

def print_usage():
    print("Usage: %s [length] [alnum|full]" % sys.argv[0])
    sys.exit(1)

if __name__ == "__main__":
    if len(sys.argv) <= 1:
        n = 20
    elif sys.argv[1].isdigit():
        n = int(sys.argv[1])
    else:
        print_usage()

    if len(sys.argv) <= 2:
        chars = alnum_chars
    elif sys.argv[2] == "alnum":
        chars = alnum_chars
    elif sys.argv[2] == "full":
        chars = full_chars
    else:
        print_usage()

    print(generate(chars, n))