1a          Write a function COTlistRange(xstart,xend,xstep) that returns alist that has:

              - as index 0 item, the value of xstart

              - as index 1 item, the value xstart+xstep

              - as index 2 item, the value (xstart+xstep)+xstep,

              and so on as long as the value does equal or pass the value ofxend.

              However, the function should return an empty string if for positivexstep, xstart>xend or if for negative xstep, xstart < xend.Here are three examples:

                       a = COTlistRange(2, 3.51, 0.5) should produce

                       a = [2, 2.5, 3., 3.5]

                       a = COTlistRange(2, 0.01, -0.5) should produce

                       a = [2, 1.5, 1., 0.5]      

                       a = COTlistRange(2, 1.51, 0.5) should produce

                       a = []   

              Your code should also have a function mainProg() for testing theCOTlistRange(xstart,xend,xstep) function and the associated if__name__ == statement. Write the mainProg() code so that it doesthe three examples shown above.

b            \"Walk\" your code of part a for the three examples, i.e. create acolumn for each variable showing in the column the evolution ofchanging object values.

c            Repeat part a with a function COTtupleRange(xstart,xend,xstep). Youare not allowed to use the tuple command to convert your resultfrom part a to a tuple.