用python计算圆周率PI

pi = 0
N = 100
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))
     print("圆周率值是:{}".format(pi))