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

tangtai chen
tangtai chen
4,844 Points
Posted by tangtai chen
tangtai chen
4,844 Points

i don't know how to apply try/except/else statement inside of a function

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

this is my code it doesn't seems right, can anyone help?

trial.py 
def add(x, y):
    try:
    except ValueError:
        return None
    else:
    x = float(x); y = float(y);
    return x + y

1 Answer

Christian Mangeng
Christian Mangeng
15,970 Points
Christian Mangeng
Christian Mangeng
15,970 Points

Hi tangtai,

it could look like that (see below). "Try" checks if the provided numbers can be converted to floats. Note that try, except and else have the same indentation (one tab, because they are inside a function), and the actions that follow also have the same (+ 1 tab compared to try, except and else):

def add(num1, num2):
    try:
        float1 = float(num1)
        float2 = float(num2)
    except ValueError:
        return None
    else:
        return float1 + float2
tangtai chen
tangtai chen
4,844 Points
tangtai chen
tangtai chen
4,844 Points

Thx for the help, I was confused about the logic behind try/except/else statements, now it makes more sense to me!