For Python,

A class Item has an itemcode and an amount. Below is the getter methods, setter methods and the sttring method: class Item: def __init__(self, itemcode, amount): self._itemcode = itemcode self._amount = amount @property def itemcode(self): return self._itemcode @property def amount(self): return self._amount @amount.setter def amount(self, amount): self._amount = amount def __str__(self): return "Itemcode: {:6s} Amount: {:4d}". format(self._itemcode, self._amount)

Create 2 user exception classes and the class Itemlist: For the 2 user exception classes, ItemExcept which is a subclass of Exception and SpecificItemExcept which is a subclass of ItemExcept. SpecificItemExcept has an instance variable: the failed item(s) and it has also a getter method to return the failed item(s). For class Itemlist, it has these below: A dictionary to record a collection of Item objects. Using Itemcode as the key in the dictionary. A search method that returns a item given the itemcode. The method reutnrs None if the item is not in the collection. An add method which adds an item into the collection when given an itemcode and an amount. Raise a ItemExcept if the item exists in the collection with a "Item exist!" message which inculde the itemcode. Or else, return the item added.