>>136
from random import random
TRYNUM = 10000000
points = ((random(), random()) for n in range(TRYNUM))
circleareacounter = 0
for point in points:
　　if point[0] ** 2 + point[1] ** 2 <= 1:
　　　　circleareacounter += 1
pi = circleareacounter * 4.0 / TRYNUM
print pi