For python

This project will store the volume of sales for a particular product for a sequence of days. It

could be for a week, or a month. We are not going to worry about what we are selling, or the

cost$,$ just the number of items sold on each day. This should be able to work for any number of

days $-$ every month doesn$$t have the same number of days. To keep it shorter for this

assignment, my example will only worry about $10$ days. We will only address the total quantity

sold each day.

Since the sales may not be reported in order, we need to create space for all the possible days

at the beginning of the program. This will be done in the createList function. We won$$t

necessarily have all the sales totals turned in all at once, so we need to be able to differentiate

between no actual sales and the number of sales for the days not having been turned in yet.

Since $0$ is possible for the number of items sold, we can$$t initialize each item to $0.$ With that in

mind, initialize each item in the list to $-1$ when the list is created.

Remember that the indexes of the actual list will be $0-$based, where people tend to create $1-$

based lists. All functions that accept a day will accept a $1-$based value. It is important when

programming to write functions that work with the nomenclature of the person using your code,

and days are $1-$based.

We will need to be able to answer some questions about the sales for each of the $10$ days. To

do so$,$ write each of the following functions. The function header must be implemented exactly

as specified. You can change the name of the parameters, but not the order or functionality of

any parameters.

Write a main function that tests each of your functions.

Required Functions

createList $($days$)$ creates a list of the specified size, initializes each value in the list to $-1,$

and returns the list.

setSales $($salesList$,$ day, numOfSales$)$ If day is valid the function sets the sales for the

specified day and returns True. If day is not valid, do nothing to the list and return False.

getSales $($salesList$,$ day$)$ returns the quantity of sales for the specified day. If day is not

valid, return None.

totalSales $($salesList$)$ returns the total quantity of sales. Only return the summation of

items where the number of sales have been reported.

numOfDaysWithSale $($salesList$)$ returns the total number of days with a reported sale.

This DOES NOT return the number of total products or the total sales.

numOfDaysWithNoSale $($salesList$)$ returns the total number of days where a sales amount

was provided, yet nothing was sold. A day unreported sales IS NOT a day with no sales. This

DOES NOT return the number of total products or the total sales.

bestDay $($salesList$)$ returns the day with the highest number of sales. You can safely

assume that there will be a single day that was the $$best day.$$

worstDay $($salesList$)$ returns the day with the lowest number of sales. You can safely

assume that there will be a single day that was the $$worst day.$$

getAverage $($salesList$)$ this function returns the average number of items sold. This value

will not include days where there has not been reported sales. This function should use the

totalSales and numOfDaysWithSale functions, DO NOT duplicate the work already done in

those functions. Return None if you are unable to calculate the average.

printSales $($salesList$)$ this function DOES create output on the display. Print out the day

$($the user$$s numbers $1$ through XX$),$ and the total number of sales for that day, IF there was a

sale that day. If there were no sales that day, leave the quantity blank. Create columns, with

each value right justified. Print an appropriate label above each column. The maximum number

of days in the list will be $31$; this will be useful for formatting the table. Do not return anything

from the function.

A brief example of using these functions might look like what follows. Note the example is

typed, not actual code, so there may be minor syntax errors. Ask about something if you are not

sure about the intent.

sales $=$ createItems $(10)$ #creates a list of $10$ values, and sets all of them to $-1$

setSales $($sales$,1,10)$

setSales $($sales$,3,9)$

itemsSold $=$ totalSales $($sales$)$ # should return $19$

daysWithASale $=$ numOfDaysWithSale $($sales$)$ # should return $2$

avgPerDay $=$ getAverage $($sales$)$ # should return $9\mathrm{.}5$

printSales $($sales$)$

Day Sales

$110$

$2$

$39$

$4$

$5$

$6$

$7$

$8$

$9$

$10$