swift 4 preferred but can do in python

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Estimating #1 The value of can be estimated by the infinite series =4(1-1+1-1+1-...) The greater the number of terms used in the calculation, the more accurate the estimate. write a function that takes a single integer N and estimates usng the first N terms of this series. Part A: Write a program that prompts the user for N then outputs the estimated value of pi. Part B: Assuming that math.pi is the correct value for pi, prompt the user for the desired accuracy, then find the minimum value of N that delivers that accuracy. ser wants the estimate to be within +/-0.0001, determine the minimum number of term:s required to achieve that level of accuracy. For example,if the u