99 Bottles of Beer

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Language Python

(Using a iterator class)

Date:	01/20/06
Author:	Eric Moritz
URL:	http://eric.themoritzfamily.com
Comments:	2
Info:	http://www.python.org
Score:	(2.67 in 43 votes)

class Song:
    def __init__(self):
        self.n = 100

    def __iter__(self):
        return self

    def next(self):
        if self.n == 0:
            raise StopIteration
        self.n = self.n - 1
        return self._get_verse(self.n)
    
    def _get_verse(self,n):
        lines = []
        data  = []
        if n > 1:
            data.append(["%s bottles" % n,"%s bottles" % n])
            data.append(["Take one down pass it around","%s bottles" % (n-1)])
        elif n == 1:
            data.append(["%s bottle" % n,"%s bottle" % n])
            data.append(["Take one down pass it around","%s bottles" % "no more"])
        elif n == 0:
            data.append(["No more bottles","no more bottles"])
            data.append(["Go to the store and buy some more","%s bottles" % 99])
            
        lines.append("%s of beer on the wall, %s of beer" % tuple(data[0]))
        lines.append("%s, %s of beer on the wall" % tuple(data[1]))
        lines.append("")
        return "\n".join(lines)

song = Song()
for stanza in song:
    print stanza

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Alternative Versions

Version	Author	Date	Comments
This example demonstrates the simplicity	Gerold Penz	07/23/05	15
Creative version	Schizo	11/06/05	16
Advanced, extensible beer/wall framework	Jamie Turner	05/17/06	7
using lambda in LISP style	J Adrian Zimmer	11/14/06	2
minimal version	Oliver Xymoron	04/20/05	5
functional, w/o variables or procedures	Ivan Tkatchev	07/14/05	2
Fully compliant version	Ricardo Garcia Gonzalez	01/15/06	7
minimal version with singular	Emlyn Jones	06/13/05	3
Exception based	Michael Galpin	02/08/08	0
New conditional expressions in 2.5	Ezequiel Pochiero	12/18/06	1

Comments

zefciu said on 06/27/06 16:29:06

I think the most pythonish example.

Ian said on 07/06/06 03:56:32

Better would be to take the number of verses as an __init__ parameter.

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one program in 1500 variations