100 bottles of beer on the wall example.

After a version by Fredrik Lundh that I found on the web somewhere.
(I like mine better, but of course that may have to do with my alcohol
consumption. :-)

Demo/scripts/beer.py

+#! /usr/bin/env python
+# By GvR, 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):
+    print bottle(n-i), "on the wall,"
+    print bottle(n-i) + "."
+    print "Take one down, pass it around,"
+    print bottle(n-i-1), "on the wall."