project$-2$

$[70$ pts$]$ You will be writing code for recording the menu items and daily sales of a lemonade stand. It will have these classes: MenuItem, SalesForDay, and LemonadeStand. All data members of each class should be marked as private $($a leading underscore in the name$).$ Since they're private, if you need to access them from outside the class, you should do so via get or set methods.

Here are descriptions of the three classes:

MenuItem:

A MenuItem object represents a menu item to be offered for sale at the lemonade stand. It has three data members:

a string for the item's name

a float for the item's wholesale cost $($how much the stand pays for the item$)$

a float for the item's selling price $($how much the stand sells the item for$)$

The Menu Item methods are:

init method $-$ takes three parameters $($name$,$ wholesale cost, selling price$)$ and uses them to initialize the data members

get methods for each of the data members: get$\_$name$(),$ get$\_$wholesale$\_$cost$(),$ and get$\_$selling$\_$price$()$

SalesForDay:

A SalesForDay object represents the sales for a particular day. It has two data members:

an integer for the number of days the stand has been open so far

a dictionary whose keys are the names of the items sold and whose values are the numbers of those items sold that day

The SalesForDay methods are:

init method $-$ takes two parameters $($number of days, sales dictionary$)$ and uses them to initialize the data members

get methods for each of the data members: get$\_$day$()$ and get$\_$sales$\_$dict$()$

LemonadeStand: Remember that the LemonadeStand class must not directly access the private data members of MenuItem and SalesForDay objects, but instead must call the appropriate get methods

A LemonadeStand object represents a lemonade stand. It has four data members:

a string for the name of the stand

an integer representing the current day

a dictionary of MenuItem objects, where the keys are the names of the items and the values are the corresponding MenuItem objects

a list of SalesForDay objects

The LemonadeStand methods are:

init method $-$ takes one parameter, a string for the name of the stand; initializes the name to that value, initializes current day to zero, initializes the menu to an empty dictionary, and initializes the sales record to an empty list

a get method for the name: get$\_$name$()$

add$\_$menu$\_$item:

Takes as a parameter a MenuItem object and adds it to the menu dictionary

New items can be added to the menu on any day

enter$\_$sales$\_$for$\_$today:

Takes as a parameter a dictionary where the keys are names of items sold and the corresponding values are how many of the item were sold $($see the example at the end of the readme$)$

If an item in the menu doesn't appear in the dictionary, then there were no sales of that item on that day. You don't need to worry about this in this method, but it's important in the next method.

If the name of any item sold doesn't match the name of any MenuItem in the dictionary of MenuItem objects, this method should do nothing except raise an InvalidSalesItemError $($you$\text{'}$ll need to define this exception class$)$

Otherwise, it should create a new SalesForDay object using the current day and the dictionary that was passed in$,$ add that object to the list of SalesForDay objects, and then increment the current day by $1$

Any time this method is called $($and the exception isn't raised$),$ exactly one SalesForDay object should be created and added to the list

sales$\_$of$\_$menu$\_$item$\_$for$\_$day:

Takes as parameters an integer representing a particular day and a string for the name of a menu item

Returns the number of that item sold on that day

This method uses the given day to find the corresponding SalesForDay object in the list and then calls its get$\_$sales$\_$dict$()$ method to get the dictionary of sales for that day

Then looks for the item name in the dictionary, taking into account that if an item in the menu doesn't appear in the dictionary, then there were no sales of that item on that day

total$\_$sales$\_$for$\_$menu$\_$item:

Takes as a parameter a string for the name of a menu item and returns the total number of that item sold over the history of the stand

This method can make use of sales$\_$of$\_$menu$\_$item$\_$for$\_$day

total$\_$profit$\_$for$\_$menu$\_$item:

Takes as a parameter a string for the name of a menu item and returns the total profit on that item over the history of the stand

The profit for any item sold is the selling price of the item minus the wholesale cost of the item

This method can make use of total$\_$sales$\_$for$\_$menu$\_$item

total$\_$profit$\_$for$\_$stand:

Takes no parameters and returns the total profit on all items sold over the history of the stand

This method can make use of total$\_$profit$\_$for$\_$menu$\_$item

So a LemonadeStand contains a dictionary of MenuItems. It also contains a list of SalesForDay objects, and each of those SalesForDay objects contains a dictionary of items sold on a particular day. At each point it's important to keep straight whether you are currently working with a list or a