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Weighted random choice (See related posts)

From Kevin Parks's recipe
import random

def w_choice(lst):
	n = random.uniform(0, 1)
	for item, weight in lst:
		if n < weight:
			break
		n = n - weight
	return item

Usage, similar to random.choice but must specify probabilities.
>>> x = w_choice( [('one',0.25), ('two',0.25), ('three',0.5)] )

to python random weighted choice by korakot on Sat Sep 17 01:41:27 -0400 2005

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