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

Posted by shivani chauhan
shivani chauhan
476 Points

please someone help me. what I'm doing wrong

You're doing great! Just one more task but it's a bigger one. Right now, we turn everything into a float. That's great so long as we're getting numbers or numbers as a string. We should handle cases where we get a non-number, though. Add a try block before where you turn your arguments into floats. Then add an except to catch the possible ValueError. Inside the except block, return None. If you're following the structure from the videos, add an else: for your final return of the added floats.

trial.py 
def add(num1,num2):
    return float(num1) + float(num2)
try:
    except valueError:
        return None
    else float(num1) + float(num2)

2 Answers

Antonio De Rose
Antonio De Rose
20,884 Points
Antonio De Rose
Antonio De Rose
20,884 Points 
def add(num1,num2):
    return float(num1) + float(num2)
try: #this isn't where the try should be coming, it does mention, before converting into floats
    except valueError:
        return None
    else float(num1) + float(num2) # else and the statement should be in 2 lines, do not forget the colon after else
shivani chauhan
shivani chauhan
476 Points
shivani chauhan
shivani chauhan
476 Points

thanks Antonio now I will do