Python: How can I store multiple user inputs when using for loop?

Question

I am trying to recreate a problem from our classwork:

Write a program that can handle a shopping event. First, it requests the number of items bought, then asks for each items' price and tax rate. Then prints the total cost.

Example:
How many items you bought: 2

For item 1
Enter the price: 10
Enter the tax rate: 0

For item 2
Enter the price: 20
Enter the tax rate: 8
Your total price is 31.6

I have no knowledge on how I would compute for items larger than 1. ie my code works for 1 item.

items = int(input("How many items did you buy? "))

for i in range(1, items+1, 1):
    print("For item ",i)
    price = float(input("Enter the price: "))
    tax_rate = float(input("Enter the tax rate: "))
    total = price + price*(tax_rate/100)

print("Your total price is", total)

I need to somehow save the totals after each iteration and add them all up. I am stumped.

Note: This is an introduction to python course and also my first programming course. We've only learned for loops thus far.

Thanks @iBug. I saw this when I was trying to use google at first and even tried to use it myself, but unfortunately we have not learned how to append yet. — CTG713
– CTG713, Commented Feb 20, 2018 at 3:48

Mike Tung · Accepted Answer · 2018-02-20 03:26:53Z

1

You need to have an initialized counter to have a running total.

items = int(input("How many items did you buy? "))
total = 0

for i in range(1, items+1, 1):
    print("For item ",i)
    price = float(input("Enter the price: "))
    tax_rate = float(input("Enter the tax rate: "))
    total += price + price*(tax_rate/100)

print("Your total price is", total)

answered Feb 20, 2018 at 3:26

Mike Tung

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2 Comments

CTG713 Over a year ago

That's really neat. I'm browsing google to learn more about the operator +=. Thank you!

BruceWayne Over a year ago

@CharlesGrealy it's a great tip to learn. Instead of doing say i = i + 1, it's just i += 1. Essentially it is "take this variable and set it equal to itself plus whatever is on the right"

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