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我担心的是我在johnzelle的《Python编程：计算机科学导论》(第二版)中为练习编写的代码的有效性。在

上面写着：Write a program that approximates the value of π by summing the terms

of this series: 4/1 - 4/3 + 4/5 - 4/7 + 4/9 - 4/11 + ... The program

should prompt the user for n, the number of terms to sum, and then

output the sum of the first n terms of this series. Have your program

subtract the approximation from the value of math.pi to see how

accurate it is.

以下是我所做的：# pi_approximation

# Program which approximates the value of Pi by summing the terms of

# this series: 4/1 - 4/3 + 4/5 - 4/7

import math

def main():

print("Welcome to Pi approximation!\n")

n = int(input("Enter the number of terms to sum: "))

approx = 0

for i in range(1, n+1, 2):

approx += 4 / i - 4 / (i+2)

print("Approximate value of pi is: " + str(approx))

print("Deviation from Pi is: " + str(math.pi - approx))

main()

我使用的是python3.6。在