Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Python Python Basics All Together Now Handle Exceptions

Anshul Laikar
Anshul Laikar
4,428 Points
Posted by Anshul Laikar
Anshul Laikar
4,428 Points

String comparison issue

try: quantity_tickets= int(input("How many tickets do you want?")) if quantity_tickets>tickets_remaining: raise ValueError("We do not have that many tickets available") except ValueError as ve: if ve=="We do not have that many tickets available": print(ve) else: print("Please enter a number")

Here is my code. Even if the "We do not have that many tickets available" error is raised, it always ends up printing the "Please enter a number" part. Why is this?

1 Answer

Jeff Muday
MOD
Jeff Muday
Treehouse Moderator 28,717 Points
Jeff Muday
Jeff Muday
Treehouse Moderator 28,717 Points

I have fallen into this trap before! We declared "ve" to be an "Exception" object. This means we can't treat it as a string unless we explicity cast it back to a string type or use ve.message to check the string.

see below:

tickets_remaining = 2

try: 
  quantity_tickets= int(input("How many tickets do you want?"))
  if quantity_tickets>tickets_remaining:
    raise ValueError("We do not have that many tickets available")
except ValueError as ve:
  # see below where we cast ve to a str object
  if str(ve)=="We do not have that many tickets available":
    print(str(ve))
  else:
    print("Please enter a number")
Anshul Laikar
Anshul Laikar
4,428 Points
Anshul Laikar
Anshul Laikar
4,428 Points

Thank you so much :)