99 Bottles of Beer

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#!/usr/bin/env python
# 	99 bottles of beer in Python by Ricardo Garcia. Public Domain code.
# 	Fully compliant version, pretty indentation, fits in 80x24.

plural = lambda n: n != 1 and "s" or ""
number = lambda n: n == 0 and "No" or str(n)
next = lambda n: (n - 1) % 100

pu_line = lambda n: n == 0 and	"Go to the store and buy some more" or	\
				"Take one down, pass it around"

verses = lambda n:	"%s bottle%s of beer on the wall!\n"		\
			"%s bottle%s of beer!\n"			\
			"%s\n"						\
			"%s bottle%s of beer on the wall!\n" %		\
			(	number(n), plural(n),
			 	number(n), plural(n),
			 	pu_line(n),
			 	number(next(n)), plural(next(n))	)

print "\n".join([verses(x) for x in range(99, -1, -1)])

Alternative Versions

Version	Author	Date	Comments	Rate
This example demonstrates the simplicity	Gerold Penz	07/23/05	8
Creative version	Schizo	11/06/05	13
minimal version	Oliver Xymoron	04/20/05	3
Advanced, extensible beer/wall framework	Jamie Turner	05/17/06	4
Exception based	Michael Galpin	02/08/08	0
Using a iterator class	Eric Moritz	01/20/06	2
New conditional expressions in 2.5	Ezequiel Pochiero	12/18/06	0
using lambda in LISP style	J Adrian Zimmer	11/14/06	0
functional, w/o variables or procedures	Ivan Tkatchev	07/14/05	1
minimal version with singular	Emlyn Jones	06/13/05	2

Comments

 gp said on 12/08/06 23:17:13

very pythonic except "and/or" paradigm. maybe it's time to rewrite it for 2.5 using "a if cond else b"?

 Ricardo Garcia Gonzalez said on 12/31/06 15:17:13

Indeed. I should have probably omitted the brackets in the last line, and used xrange instead of range.

 LR said on 03/19/07 15:51:45

Calling the code above "pythonic" is not really helpful. Python is an very readable language, but this example is anything but.

 Ricardo Garcia Gonzalez said on 03/29/07 19:15:13

I have updated the script for Python 2.5. I'm not sure I should post it as a new version, but in the mean time, I'll use the comments section.

<pre>
#!/usr/bin/env python
# 99 bottles of beer in Python by Ricardo Garcia. Public Domain code.
# Fully compliant version, pretty indentation, fits in 80x24.
# This version requires Python 2.5.

def plural(n): return ('s' if n != 1 else '')
def numtxt(n): return (str(n) if n != 0 else 'No')
def next(n): return ((n - 1) % 100)

def line_1_4(n): return ('%s bottle%s of beer on the wall!'
% (numtxt(n), plural(n)))

def line_2(n): return ('%s bottle%s of beer!'
% (numtxt(n), plural(n)))

def line_3(n): return ('Take one down, pass it around' if n != 0
else 'Go to the store and buy some more')

def verses(n): return ('%s\n%s\n%s\n%s\n'
% (line_1_4(n), line_2(n),
line_3(n), line_1_4(next(n))))

print '\n'.join(verses(x) for x in xrange(99, -1, -1))
</pre>

 Ricardo Garcia Gonzalez said on 03/29/07 19:16:22

Aw, fuck. I suspected it was going to screw it up... and it did. Sorry. :(

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