Write a Python program to get the top three items in a shop.
Example 1:
Input: {"item1": 45.50, "item2": 35.50, "item3": 41.30, "item4": 55.40, "item5": 24.50}
Output: [("item4", 55.40), ("item1", 45.50), ("item3", 41.30)]
Example 2:
Input: {"item1": 22.50, "item2": 25.50, "item3": 27.30, "item4": 22.40, "item5": 29.50}
Output: [("item5", 29.50), ("item3", 27.30), ("item2", 25.50)]