from random import random
from math import sqrt
from time import clock
darts = 10000
hits =0.0
clock()
for i in range(1,darts+1):
x,y = random(),random
dist=sqrt(x * 2+y * 2)
if dist <=1.0:
hits=hits+1
pi=4*(hits/darts)
print("PI值是{}.",format(pi))
print("运行时间是：{:5.5}s",format(clock()))
原文：http://www.cnblogs.com/gouxiong/p/6714293.html