Wrtie buyLotsOfFruit(orderList) function in Python which takes a list of (fruit,pound) tuples and returns the cost of your list. If there is some fruit in the list which doesn't appear in fruitPrices it should print an error message and return None. Please do not change the fruitPrices variable.

example list :

fruitPrices = {'apples':2.00, 'oranges': 1.50, 'pears': 1.75}