用python计算圆周率PI

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