Create unit8_ex8.2.2.py

Author: lironmiz

unit8_ex8.2.2.py

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+# exercise 8.2.2 from unit 8
+'''
+Exercise 8.2.2
+Write a function called sort_prices defined as follows:
+
+def sort_prices(list_of_tuples):
+The function receives a list of tuples that each have an item and a price.
+The function returns a list of tuples sorted by the price of the items in them from the largest to the smallest.
+
+Define the list of tuples that the function receives according to the following form:
+
+[('item', 'price'), ('item', 'price'), ('item', 'price')]
+Note that all members are of string type and price is written as a non-integer number.
+
+Running examples of the sort_prices function
+>>> products = [('milk', '5.5'), ('candy', '2.5'), ('bread', '9.0')]
+>>> sort_prices(products)
+[('bread', '9.0'), ('milk', '5.5'), ('candy', '2.5')]
+'''
+
+def sort_prices(list_of_tuples):
+    def get_price(tuple):
+        return float(tuple[1])
+    
+    # sort the list of tuples by the price of the item in each tuple
+    sorted_list = sorted(list_of_tuples, key=get_price, reverse=True)
+    return sorted_list
+
+# test the function
+products = [('milk', '5.5'), ('candy', '2.5'), ('bread', '9.0')]
+print(sort_prices(products))