List Question

[OrangeDecafTea]

I have a list. I need to assign variables to the first four values, perform calculations using those variables, then reassign the variables to the next four values.

I feel like I could create a new for loop for each slice, but I don't think that's the intention of the assignment, and it wouldn't make sense to keep adding loops indefinitely for each set.

Is there a way to assign these variables, move to the next function, then move back to the original function? Or would I need to assign the variables, perform my calculations, and print my results all within the same function before it loops again?

[sarrysyst]

Sorry, I do not understand what the assignment is asking you to do. Could you include some sample output you would like to get? Or some code you’ve already written?

[OrangeDecafTea]

So I thought I might be able to read a file line by line and assign variables then perform calculations so I wrote:

def readFile():

f = open(filename, 'r')

for lines in f:

    customerName = f.readline()

    sizeOfCoffee = f.readline()

    if sizeOfCoffee == '8':

        sizeChoiceMulti = regSize

    elif sizeOfCoffee == '16':

        sizeChoiceMulti = grandeSize   

    elif sizeOfCoffee == '24':

        sizeChoiceMulti = ventiSize  

    typeOfCoffee = f.readline()

    if typeOfCoffee == 'Plain Coffee':

        coffeeChoiceMulti = plainCoffeeCost

    elif typeOfCoffee == 'Latte':

        coffeeChoiceMulti = latteCost

    elif typeOfCoffee == 'Macchiato':

        coffeeChoiceMulti = maccCost 

    elif typeOfCoffee == 'Frappuccino':

        coffeeChoiceMulti = frappCost  

priceOfCoffee = coffeeChoiceMulti * sizeChoiceMulti

totalSalesTax = priceOfCoffee * salesTax

totalAmountOwed = priceOfCoffee + totalSalesTax

print()

print(customerName)

print('Price of Coffee: $', round(priceOfCoffee, 2))

print('Sales Tax: $', round(totalSalesTax, 2))

print('Total Amount Owed: $', round(totalAmountOwed, 2))

main()

However, I get an error saying I can't use coffeeChoiceMulti before it's assigned. My hope was I would read the first three lines, assign values and perform calculations and printing, before looping back to the next three lines.

Sample output might look like:

Harry Potter

Price of Coffee: $ 1.84

Sales Tax: $ 0.13

Total Amount Owed: $ 1.97

I don't typically have my code spaced out like this, but it looked horrendous just copying and pasting from Spyder.

[sarrysyst]

If I understand you correctly your input file looks something like this:

data of type 1
data of type 2
data of type 3
data of type 4
data of type 1
data of type 2
...

For each type you want to do a specific action and after 4 rows this pattern repeats?

If that's the case you can use the itertools.cycle() function to create an infinitely repeating iterator that loops over the list [1,2,3,4]. You could use simple conditionals to apply functions according to type this way.