fizzbuzz

fizzbuzz.py

#! /usr/bin/env python
# -*- coding: utf-8 -*-

import sys

def main(maxnum):
    for idx in xrange(1, maxnum+1):
        val = idx

        if idx % 3 == 0:
            val = "Fizz"
        if idx % 5 == 0:
            val = "Buzz"
        if idx % 15 == 0:
            val = "FizzBuzz"

        print val

def usage():
    """print usage"""
    print "usage: python fizzbuzz.py maxnumber"

def error(msg):
    """print error message, usage and exit program"""
    print "error: %s" % msg
    usage()
    sys.exit(1)

if __name__ == "__main__":
    if len(sys.argv) != 2:
        error("invalid argments")

    num = sys.argv[1]
    if not num.isdigit():
        error("maxnumber must be digit")

    main(int(num))