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# Python Basics - Refactoring lesson problem

Hi. Following along in my Workspace, I think I matched the code to Craig's, but I started to get confused when he created the function calculate_price and changed num_tickets to number_of_tickets. I couldn't find anywhere that number_of_tickets was defined, but his code worked fine.

My code resulted in this: treehouse:~/workspace\$ python masterticket.py
There are 100 tickets remaining.
How many tickets would you like, Charles? 4
The total due is \$<function calculate_price at 0x7fda9d1c8e18>.

```SERVICE_CHARGE = 2
TICKET_PRICE = 10

tickets_remaining = 100

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

while tickets_remaining >= 1:
print("There are {} tickets remaining.".format(tickets_remaining))
name = input("What's your name?  ")
num_tickets = input("How many tickets would you like, {}?  ".format(name))
try:
num_tickets = int(num_tickets)
if num_tickets > tickets_remaining:
raise ValueError("There are only {} tickets remaining".format(tickets_remaining))
except ValueError as err:
print("Oh no, we ran into an issue.  {}. Please try again".format(err))
else:
amount_due = calculate_price(num_tickets)
print("The total due is \${}.".format(calculate_price))
should_proceed = input("Do you want to proceed?  Y/N  ")
if should_proceed.lower() == "y":
# TODO: Gather credit card information and process it
print("SOLD!")
tickets_remaining -= num_tickets
else:
print("Thank you anyway, {}!".format(name))
print("Sorry, the tickets are all sold out!!! :(")
```

Sorry, I thought I followed directions on how to paste code but obviously didn't get it right.

Use the instructions for code formatting in the Markdown Cheatsheet pop-up below the "Add an Answer" area.
Or watch this video on code formatting.

And those 3 marks need to be accents ("back-ticks") instead of apostrophes.

From what I can see in the unformatted code, "number_of_tickets" is a function parameter name.

Parameters only act as placeholders for variables or values that are passed when the function is called, and therefore would not be defined separately.

Also, I spotted this expression: "`"The total due is \${}.".format(calculate_price)`", which doesn't make sense if "calculate_price" is the name of a function. Did you mean to call the function and pass it an argument there?

Thank you Steven

Happy to help. Feel free to edit and fix your formatting for posterity. Hint: if you add the 2 letters "py" immediately after the first 3 apostrophes, markdown will apply syntax coloring to make the code even more readable.

Steven - Bingo, you spotted the error. Instead of writing print("The total due is \${}.".format(amount_due)) I wrote print("The total due is \${}.".format(calculate price))

It is amazing how easy it is to get stuck in a state of blindness, not being able to see the errors that are right there. I suspect that writing code does wonders for exercising the "attention to detail" muscles. Thanks again.