Python - How to get each item multiplied by the amount the user inputs? [closed]

Question

I have this python3 code, it's a simple grocery list and the user can type the items he wants to buy and then the output is the total cost. But instead of repeating each item multiple times, I want the user to input the amount like..."2chicken, 2tomato" instead of "chicken, chicken, tomato, tomato"..how do i do this?

items_dict={"chicken": 50, "fish":30, "tomato":12, "chips":5}
print("Our shop has", tuple(items_dict))
prompt=input("What will you buy?\n").split(', ')
total_price=0

for items in prompt:
    try:
        total_price += items_dict[items]
    except:
        total_price="Some items aren't available to buy."
        break
print ("You have to pay", total_price, "EGP")

Input: 2chicken, 22tomato, 100chips

Expected Output: You have to pay 864 EGP.

Answer 1

I would have approach this using re.match in the following way:

import re
items_dict={"chicken": 50, "fish":30, "tomato":12, "chips":5}
print("Our shop has", tuple(items_dict))
prompt=input("What will you buy?\n").split(', ')

total_price=0

for items in prompt:
    match = re.match("(\d+)(\w+)", items) # Here group(1) => (\d+) will match the quantity of item and 
                                          # group(2) => (\w+) will match the name of product.
    try:
        total_price += (int(match.group(1))*items_dict[match.group(2)])
    except:
        total_price="Some items aren't available to buy."
        
print ("You have to pay", total_price, "EGP")

Output:

Our shop has ('chicken', 'fish', 'tomato', 'chips')
What will you buy?
2chicken, 22tomato, 100chips
You have to pay 864 EGP