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#! /opt/alt/python37/bin/python3.7
"""
A Python version of the classic "bottles of beer on the wall" programming
example.
By Guido van Rossum, demystified after a version by Fredrik Lundh.
"""
import sys
n = 100
if sys.argv[1:]:
n = int(sys.argv[1])
def bottle(n):
if n == 0: return "no more bottles of beer"
if n == 1: return "one bottle of beer"
return str(n) + " bottles of beer"
for i in range(n, 0, -1):
print(bottle(i), "on the wall,")
print(bottle(i) + ".")
print("Take one down, pass it around,")
print(bottle(i-1), "on the wall.")