99 Bottles of Beer/Python
99 Bottles of Beer done in Python.
Normal Code
<lang python>def sing(b, end):
print(b or 'No more','bottle'+('s' if b-1 else ), end)
for i in range(99, 0, -1):
sing(i, 'of beer on the wall,') sing(i, 'of beer,') print('Take one down, pass it around,') sing(i-1, 'of beer on the wall.\n')</lang>
Using a template
<lang python>verse = \ %i bottles of beer on the wall %i bottles of beer Take one down, pass it around %i bottles of beer on the wall
for bottles in range(99,0,-1):
print verse % (bottles, bottles, bottles-1) </lang>
New-style template (Python 2.6)
<lang python>verse = \ {some} bottles of beer on the wall {some} bottles of beer Take one down, pass it around {less} bottles of beer on the wall
for bottles in range(99,0,-1):
print verse.format(some=bottles, less=bottles-1) </lang>
"Clever" generator expression
<lang python>a, b, c, s = " bottles of beer", " on the wall\n", "Take one down, pass it around\n", str print "\n".join(s(x)+a+b+s(x)+a+"\n"+c+s(x-1)+a+b for x in xrange(99, 0, -1))</lang>
Enhanced "Clever" generator expression using lambda
<lang python>a = lambda n: "%u bottle%s of beer on the wall\n" % (n, "s"[n==1:]) print "\n".join(a(x)+a(x)[:-13]+"\nTake one down, pass it around\n"+a(x-1) for x in xrange(99, 0, -1))</lang>
Using a generator expression (Python 3)
<lang python>#!/usr/bin/env python3 """\ {0} {2} of beer on the wall {0} {2} of beer Take one down, pass it around {1} {3} of beer on the wall """ print("\n".join(
__doc__.format( i, i - 1, "bottle" if i == 1 else "bottles", "bottle" if i - 1 == 1 else "bottles" ) for i in range(99, 0, -1)
), end="")</lang>
A wordy version
<lang python>ones = ( , 'one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight', 'nine' ) prefixes = ('thir', 'four', 'fif', 'six', 'seven', 'eigh', 'nine') tens = [, , 'twenty' ] teens = ['ten', 'eleven', 'twelve'] for prefix in prefixes:
tens.append(prefix + 'ty') teens.append(prefix +'teen')
tens[4] = 'forty'
def number(num):
"get the wordy version of a number" ten, one = divmod(num, 10) if ten == 0 and one == 0: return 'no' elif ten == 0: return ones[one] elif ten == 1: return teens[one] elif one == 0: return tens[ten] else: return "%s-%s" % (tens[ten], ones[one])
def bottles(beer):
"our rephrase" return "%s bottle%s of beer" % ( number(beer).capitalize(), 's' if beer > 1 else )
onthewall = 'on the wall' takeonedown = 'Take one down, pass it around' for beer in range(99, 0, -1):
print bottles(beer), onthewall print bottles(beer) print takeonedown print bottles(beer-1), onthewall print</lang>
String Formatting
<lang python>for n in xrange(99, 0, -1):
## The formatting performs a conditional check on the variable. ## If it formats the first open for False, and the second for True print n, 'bottle%s of beer on the the wall.' % ('s', )[n == 1] print n, 'bottle%s of beer.' % ('s', )[n == 1] print 'Take one down, pass it around.' print n - 1, 'bottle%s of beer on the wall.\n' % ('s', )[n - 1 == 1]</lang>