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Python

Posted by wizard xxdx
.a{fill-rule:evenodd;}techdegree
wizard xxdx
Python Development Techdegree Student 1,096 Points

Can someone help me with this python script?

TICKET_PRICE = 10

tickets_remaining = 100  

while tickets_remaining >= 1:
    print("They are {} ticket remaning".format(tickets_remaining))
    client_name = input("What is your name? ")
    num_ticket = input("{}, How many ticket do you want? ".format(client_name))
    num_ticket = int(num_ticket)
    amount_due = num_ticket * TICKET_PRICE
    print("The ticket due is ${}".format(amount_due))
    user_info = input("Do you want to procced Y/N? ")
    if user_info.lower() == "y":
        print("SOLD!!!")
        tickets_remaining -= num_ticket
    else :
        print("Thanks any ways, {}".format(client_name))
print("Ticket soldout :( ")
boi
boi
14,242 Points
boi
boi
14,242 Points

You need help with what exactly?

4 Answers

Peter Vann
Peter Vann
36,427 Points

This adds the handlers for trying to enter text instead of a number for the ticket quantity and if the user trys to buy more tickets than are available: 

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))
    client_name = input("What is your name? ")
    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! :( ")
Peter Vann
Peter Vann
36,427 Points
Peter Vann
Peter Vann
36,427 Points

Yo Wiz,

Here is my slightly augmented version of your code (so far):

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))
    client_name = input("What is your name? ")
    num_ticket = input("{}, how many tickets do you want to purchase? ".format(client_name))
    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! :( ")

One thing it lacks is any error handling for cases where the user inputs unacceptable data (such as a number for the name, or a string for the ticket quantity) or if someone tries to buy more than the remaining tickets available).

I'll try to add some of that.

BTW, I do my testing of python code snippets here:

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

I hope that helps.

Stay safe and happy coding!

Peter Vann
Peter Vann
36,427 Points
Peter Vann
Peter Vann
36,427 Points

Now I've added a check to make sure the name is a string:

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? ")
        try:
            val = int(client_name)
        except ValueError:
            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! :( ")
Peter Vann
Peter Vann
36,427 Points
Peter Vann
Peter Vann
36,427 Points

In this (should be the last) version, I added a handler for the case if the user just hits enter instead of actually typing something for the name.

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)
            except ValueError:
                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! :( ")

Probably the next step (and I'll leave it to you, unless you have more questions) would be to refactor the code to break-up some of the functionality into functions, so the main execution is more readable.

I hope that helps.

Stay safe and happy coding!

wizard xxdx
.a{fill-rule:evenodd;}techdegree
wizard xxdx
Python Development Techdegree Student 1,096 Points

Thanks for your assistance, I've understood the problem.