help please! How do I create a loop inside of an existing loop?

Question

I want to create a loop inside of the loop, so after the error message pop up, the same question raise again until answer is correct, instead of starting answering all the questions again from beginning.,

Here is my code:

TICKET_PRICE = 10
SERVICE_CHARGE = 2

tickets_remaining = 100

def calculate_price(number_of_tickets):
  return (number_of_tickets * TICKET_PRICE) + SERVICE_CHARGE

while tickets_remaining >= 1 : 
      print("\n There are {} tickets remaining.".format(tickets_remaining))
      name = input("\n What is your name?  ")
      try:
        num_tickets = input("How many tickets would you like, {}?  ".format(name))
        if all(char.isdigit() for char in num_tickets) == False:
          raise ValueError("input is not valid number. ")
        else:
          num_tickets = int(num_tickets)
        if num_tickets > tickets_remaining:
           raise ValueError ("{}, please insert the good number! No more than {} tickets available at this moment..\n".format(name,tickets_remaining))
      except ValueError as err :
          print("Oh no, you are wrong! {} ".format(err))
      else:
        amount_due = calculate_price(num_tickets)
        print("The total due is ${}".format(amount_due))
      try:
        procedure = input("{}, do you want to procede ? Please print y/n  ".format(name))
        if (procedure.lower() == "y" or procedure.lower() == "n") == False :
          raise ValueError ("Please type y/n. Thank you!")
        else:
          if procedure.lower() == "y" : 
            print("SOLD") 
            tickets_remaining -= num_tickets
            print("{} tickets remaining".format(tickets_remaining))
          else:
            print("You will regret, this is a bad choice!")
      except ValueError as err :
        print('{}'.format(err))
      print("Have a blessed day {}".format(name))

Answer 1 · 2018-07-20T19:29:08Z

July 20, 2018 7:29pm

There's nothing special about a loop inside another loop, except an extra level of indenting:

x = 3
while x:
    print("outer loop")
    y = 2
    while y:
        print("inner loop")
        y -= 1
    x -= 1

Answer 2 · 2018-07-20T19:57:33Z

July 20, 2018 7:57pm

Thank you, I got it!

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Andrei Saranut

Andrei Saranut

help please! How do I create a loop inside of an existing loop?

2 Answers

Steven Parker

Steven Parker

Andrei Saranut

Andrei Saranut