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transactions module

These are the two POS programs. Here is the code to the one
used in the coffee bar (that you wrote):

def save_transaction(price, credit_card, description):
file = open("transactions.txt", "a")
file.write("%16s%07d%16s\n" % (credit_card, price * 100, description))
file.close()
from transactions import *
items = ["DONUT", "LATTE", "FILTER", "MUFFIN"]
prices = [1.50, 2.20, 1.80, 1.20]
running = True

while running:
option = 1
for choice in items:
print(str(option) + ". " + choice)
option = option + 1
print(str(option) + ". Quit")
choice = int(input("Choose an option: "))
if choice == option:
running = False
else:
credit_card = input("Credit card number: ")
save_transaction(prices[choice - 1], credit_card, items[choice - 1])

196 Chapter 6