Description of the Shopper Class

Class variable

There are six class variables i$.$e$.$ variables that are shared by all objects of this class

$\_\_$prices

This is a python dict that contains the grocery items as well as their unit price. This is defined as

follows:

$\_\_$prices $=$

$\{$ 'apple': $1\mathrm{.}8,$ 'bread': $2\mathrm{.}2,$ 'milk': $4\mathrm{.}9,$ 'pepper': $1\mathrm{.}2\}$

$\_\_$sale$\_$items

This is a list that contains all the items that are on sale in this period. A discount of $15\%$ is applied

to the price of each item in this collection. This is defined as follows:

$\_\_$sale$\_$items $=$ 'apple banana'.split$()$

Four other class variable that are define as follows:

$\_\_$discount$\_$threshold $=6$

When the total cost of a purchase exceeds this amount then a discount is applied to the cost

$\_\_$default$\_$price $=2\mathrm{.}50$

If an item is not found in the $\_\_$prices dictionary, then this will be the default price

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$\_\_$volume$\_$discount $=0\mathrm{.}9$

This is the rate of discount when the total cost exceeds the discount$\_$threshold

$\_\_$sales$\_$discount $=0\mathrm{.}85$

This is the rate of discount on an item if this item is in the $\_\_$sales$\_$time list.

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