1. Modular Programming¶

1.1. Transaction File Transactions.txt¶

1.2. Sale of Salgados¶

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()

articles = ["Sfiha","Cocina","Pastel","Pan de queso"]
prices = [1.50,2.20,1.80,1.20]
running = True

while running:
   option = 1
   for choose in articles:
      print(str(option) + "." + choose)
      option += 1
   print(str(option) + ".Finalizar")
   choose = int(input("Escoja una opción: "))
   if choose == option:
      #escolheu a ultima opcion Finalizar
      running = False
   else:
      credit = input("Número de tarjeta de crédito: ")
      save_transaction(prices[choose-1],credit,articles[choose-1])

Issues: the bank rejected the entire transaction file for the next day period!
Not all credit cards were valid
Prices were too high: donut sold for R $ 50,791.42!
There were no issues in the other periods. What happened

The bank changed the order of the data! [Price / Credit Card / Article]