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 (2015) Logic in Python Try and Except

Mattan Yedidya
Mattan Yedidya
1,084 Points
Posted by Mattan Yedidya
Mattan Yedidya
1,084 Points

Catching a value error

def add(a, b): return float(a) + float(b)

try:
num = add(input("Enter number A: "), input("Enter number B: ")) except ValueError: return None else: return num

what is wrong with this code?

trial.py 
def add(a, b):
    return float(a) + float(b)



try:  
    num = add(input("Enter number A: "), input("Enter number B: "))
except ValueError:
    return None
else:
    return num

1 Answer

Steven Parker
Steven Parker
230,995 Points
Steven Parker
Steven Parker
230,995 Points

There are a few issues here:

  • all code for this challenge should be part of the function
  • the values used by the function are passed as arguments, there will be no need to input anything
  • for the value error to be detected, the format conversions must occur inside the "try" section