1#!/usr/bin/env python3
2
3"""
4A Python version of the classic "bottles of beer on the wall" programming
5example.
6
7By Guido van Rossum, demystified after a version by Fredrik Lundh.
8"""
9
10import sys
11
12n = 100
13if sys.argv[1:]:
14    n = int(sys.argv[1])
15
16def bottle(n):
17    if n == 0: return "no more bottles of beer"
18    if n == 1: return "one bottle of beer"
19    return str(n) + " bottles of beer"
20
21for i in range(n, 0, -1):
22    print(bottle(i), "on the wall,")
23    print(bottle(i) + ".")
24    print("Take one down, pass it around,")
25    print(bottle(i-1), "on the wall.")
26