fh = open('BreadBasket_DMS.csv','r')

Problem 1: Read the provided file and construct a dictionary where keys are individual items, and values are the number of times the items have been purchased in the coffee shop. Write a function getltems(aDictionary, TopOrBottom, N) that returns a list of tuples of the top N (or bottom N) items and associated values (i.e., number of times purchased) 1. 2. aDictionary: a dictionary of the format described in Part 1. TopOrBottom: an integer that takes the values 1 or -1. The constant 1 indicates we want to get the top N items and the constant -1 indicates that we want to get the bottom N items. N: an integer that represents the number of items to be returned. The function must return None if any of the input parameters are invalid. In particular, you cannot more items than the total number of items available in the shop