Need help writing this program in python

A. ArithmeticSummer.py An arithmetic sequence is one where each term is of the form a*n+b where a and b are fixed, and n starts at 1 and increases by one with each term. For example 2, 4, 6, 8, 10 is the start of an arithmetic sequence with a=2 and b=0 6, 10, 14, 18, 22, 26, is the start of an arithmetic sequence with a=4 and b=2 and .5, 1.5, 2.5, 3.5, is the start of an arithmetic sequence with a=1 and b=-0.5 You will write a program that computes the sum of the first n terms of an arithmetic sequence. You should ask for values of a and b in one input statement. You should then ask for the number of terms to be included in the sum, k. You will then compute and print the values of n, the nth term, and the nth partial sum, moderately neatly on a line using tabs. Your table should have the columns labeled. There is a formula for the sum of the first k terms of an arithmetic sequence: (k/2)(first term + last term). So if the sequence is 7,9, 11, 13, ...for ten terms, (a=2, b=5, k=10), the sum will be (10/2)(7+25)=160.0. This I will call the "theoretical sum". After you have computed the k partial sums in a table, print both the final computed sum (from adding each term) and the theoretical sum (using the above formula), labeled. Here is a sample output: Enter the values for a and bin an+b. Enter as a,b: 2,5 How many terms in your series? 10 term sum Ovo AWN PO WP 91 23 112 135 10 25 160 calculated sum: 160 theoretical sum: 160.0 Run the program with 3 different sets of values for a, b, and k