Python 3

n = int(input("请输入想要计算到小数点后的位数:"))
t = n+10
b = 10**t
x1 = b*4//5
x2 = b // -239
s = x1+x2
n *= 2
for i in range(3, n, 2):
    x1 //= -25
    x2 //= -57121
    x = (x1+x2) // i
    s += x
pai = s*4
pai //= 10**10
print(pai)

求翻译QAQ！！