圆周率

def PI(n):

pi=0

for k in range(n):

pi += 1/pow(16,k)*(4/(8*k+1)-2/(8*k+4)-1/(8*k+5)-1/(8*k+6))

return pi

import time

scale = 20

print("算法开始".center(scale+4,'-'))

for i in range(scale+1):

a='*' * i

b='.' * (scale-i)

c=(i/scale)*100

pi = PI(1000)

print("{:^3.0f}%[{}->{}]".format(c,a,b))

time.sleep(0.1)

print("42号 圆周率值是：{}".format(pi))

print("算法结束".center(scale+4,'-'))