Constructor

The constructor takes two argument that represents the name of the shopper and the amount of

money she has. It assigns the argument to appropriate instance variable. It also creates an empty

list to store the purchases.

Each purchase is a single tuple comprising of the name of the item and the price actually paid for

the item.

Instance property

There is a single instance property that returns the name of this shopper object

Class method

There are three class methods:

$1.$ One that returns the price list.

$2.$ One that returns the list of sale items.

$3.$ One that adds a new item to the sale items list.

Instance method

There are two instance method:

purchase

This method takes a list of items to be purchase. It calculates the total price of the purchase by

processing each item in the argument as show below:

The price of an item is obtained from the price list. If it is not found in the price list then the

default price is used. $[$How to determine if an item in not in the dict$]$

If the item is in the sales list then a discount is applied to the price

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The item as well as the result price is added to the list as a tuple. $[$How to create a tuple with

name and price and how to add the tuple to the list$]$

When all the items are processed, if the final cost is over the credit threshold, then a

discount is applied to this amount and then subtracted from the amount of money this

object has left over.

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This method returns a string representing this object i$.$e$.$ the name, cash and all its purchases

pertaining to this shopper