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

Munesh Raj Lakhey
Munesh Raj Lakhey
4,408 Points
Posted by Munesh Raj Lakhey
Munesh Raj Lakhey
4,408 Points

why do I get, "NameError: name 'add' is not defined"

try/except is not working

trial.py 
def add(a, b):
  try:
    x = float(a)
    y = float(b)
  except ValueError:
    return none  
  else:
    return x + y

2 Answers

Tobias Helmrich
Tobias Helmrich
31,603 Points
Tobias Helmrich
Tobias Helmrich
31,603 Points

Hey Munesh,

you almost got it right! You just have to capitalize the N in "None".

Like so:

def add(a, b):
  try:
    x = float(a)
    y = float(b)
  except ValueError:
    return None  
  else:
    return x + y

I hope that helps! :)