有进度条圆周率计算

from random import random
from math import sqrt
from time import clock
DARTS = 10**7
hits = 0.0
a=1
clock()
for i in range(1, DARTS+1):       //用抛洒点求解π值
    x, y = random(), random()
    dist = sqrt(x ** 2 + y ** 2)
    if dist <= 1.0:
        hits = hits + 1
        
    if i ==DARTS*0.01*a:         //进度条
        print("\r%{}[{}->{}]".format(a,‘*‘*a,‘-‘*(10-a)),end="")
        a+=3
pi = 4 * (hits/DARTS)
print("Pi值是{}.".format(pi))
print("运行时间是: {:5.5}s".format(clock()))