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This is the most obscure piece of Python code I could write to do the same thing :

def birthday(people=23): import random days = 365 sample_size = 1000 return reduce(lambda x, y : x + y, (len(s) != len(set(s)) for s in (map(lambda x: random.choice(range(x)), (days, )*people) for i in range(sample_size))))

I am sure someone can beat it ;) let me know http://www.3kwa.com/Logbook/20070708

How do I get the code to indent properly?

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def birthday(people=23): import random days = 365 sample_size = 1000 return reduce(lambda x, y : x + y, (len(s) != len(set(s)) for s in (map(lambda x: random.choice(range(x)), (days, )*people) for i in range(sample_size))))

(two empty lines, then one space in front of every code line)

def birthday(people=23): from random import randint as rand; return sum([len(set([rand(1,365) for x in range(people)])) != people for i in range(1000)])

(constructs fewer inner lists, otherwise changes are completely cosmetic)

ah yes indeed much better! I tried to follow the K structure too much, but your code is too readable :D

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