It is often adventageous to be able to transfere data between multiple lists whi

Question

It is often adventageous to be able to transfere data between multiple lists while rearranging their order. For instance, say that list1 = [1,2,3,4,5,6,7,8,9] and you wish to add the numbers in the index range 4:7 of list1 to another list, list2, in reverse order while simulataneously removing them from list1. If list2 = [100,200], the result will be list2 = [100,200,7,6,5]. Write a function named transform that takes as arguments list1, list2, r1, and r2, that removes items from list1 in the slice r1:r2, appends them onto list2 in reverse order, and returns the resulting list. For example, in this case, the function call will be transform(list1, list2, 4,7).

Explanation / Answer

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def transform(l1,l2,r1,r2):
    while r2 > r1 :
        l2.append(l1[r2-1])
        l1.remove(r2)
        r2 = r2 - 1

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