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Python

Posted by matthew mahoney
.a{fill-rule:evenodd;}techdegree
matthew mahoney
Python Development Techdegree Student 2,536 Points

Master_Ticket.py

So I messed up this code somewhere along when I added the "else" statement after the "try" statement... i know it has something to do with the indentation but I'm not sure.

TICKET_PRICE = 10

tickets_remaining = 100

user_name = input("Hello there, what should we call you? ")

while tickets_remaining >= 1: print(f"Okay, {user_name}, tickets are {TICKET_PRICE} each. There are {tickets_remaining} tickets available.") number_of_tickets = input("How many would you like? ") try: number_of_tickets = int(number_of_tickets) except ValueError: print("Oh no! Doesnt look like you like to play by the rules! Try again! ") else: price = int(number_of_tickets) * TICKET_PRICE print(f"The total due for that many tickets would be ${price}.") buy = input(f"Would you like to continue? Your card will be charged ${price}. y/n? ") if buy == "y": print("SOLD!") tickets_remaining -= int(number_of_tickets) print(f"There are now {tickets_remaining} tickets remaining for purchase, just in case you change your mind.") else: print(f"Thanks {user_name}, for wasting my prescious bits, for nothing!") print(f"Sorry {user_name}, we're all sold out of tickets :(.")

1 Answer

Peter Vann
Peter Vann
36,427 Points

Hi Matthew!

This is probably overkill, but at least it should give you a better handle on proper spacing in the try/except/else blocks...

(And make sure your indents are precisely 4/8/12/16/20/etc... spaces only - don't use tabs.)

Here is a version of my solution (which goes beyond the challenge) with error handling:

TICKET_PRICE = 10

tickets_remaining = 100  

while tickets_remaining >= 1:
    if tickets_remaining > 1:
        verb = "are"
        remaining_s = "s"
    else:
        verb = "is"
        remaining_s = ""
    print("There {} {} ticket{} remaning (at $10.00 per ticket).".format(verb, tickets_remaining, remaining_s))
    valid = False
    while valid != True:
        client_name = input("What is your name? ")
        if (len(client_name) == 0):
            print("*** INVALID SELECTION ***")
        else:
            try:
                val = int(client_name) ###  IF THIS FAILS, client_name is a string - the desired value type  ###
            except ValueError: ###  BACKWORDS LOGIC HERE  ###
                valid = True
            else:
                print("*** INVALID SELECTION ***")
    valid = False
    while valid != True:
        num_ticket = input("{}, how many tickets do you want to purchase? ".format(client_name))
        try:
            val = int(num_ticket)
        except ValueError:
            print("*** INVALID SELECTION ***")
            continue
        if val <= tickets_remaining:
            valid = True
        else:
            print("*** ERROR ***: There {} only {} ticket{} remaining. Try again.".format(verb, tickets_remaining, remaining_s))
    num_ticket = int(num_ticket)
    if num_ticket > 1:
        num_s = "s"
    else:
        num_s = ""
    amount_due = num_ticket * TICKET_PRICE
    print("The total amout due is ${}.00 for {} ticket{}.".format(amount_due, num_ticket, num_s))
    user_info = input("Do you want to procced Y/N? ").lower()
    if user_info == "y":
        print("SOLD!!!")
        tickets_remaining -= num_ticket
    else :
        print("Thanks anyways, {}".format(client_name))
print("Tickets soldout! :( ")

If you notice, in one section I sort of use ValueError backwards, but it makes it work. - I try to cast clientName to an int, and when it errors, I know it's a string (and therefore valid when it errors!?!) Again, kind of backwards logic, but sometimes you have to think outside-the-box!?! LOL

From this thread:

https://teamtreehouse.com/community/can-someone-help-me-with-this-python-script

You can test it here:

https://www.katacoda.com/courses/python/playground

I hope that helps.

Stay safe and happy coding!

matthew mahoney
.a{fill-rule:evenodd;}techdegree
matthew mahoney
Python Development Techdegree Student 2,536 Points

Wonderful as always, Peter. So the problem was my indenting for the else block? I suspected so.

Thanks, Matt