Python , IN A HURRY!!

Question 3 ( 32 points ) : The list my_list is doubled value if each element appears exactly twice in 2 successive places in the list (one after the other). example: 10 10 30 30 -5 -5 12 12 17 17 -2 -2 15 15 Sometimes it can occur that one of the elements (only one element) appears only once and not 2 times as required. Write a function def f3 (my list) my_list is such a list that almost doubled value except 1 element that appears only 1 time. The function finds the value of this element and its position and returns both as a result, according to the following example : b = [10,10,30,30,9,-5,-5,12,12,17,17] val, pos=f3 (b) print (val, pos) we get 94 Because the value that appears only 1 time is 9 and it is located in index 4 in the list. Requirement : The function should be efficient in time and place