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Python Python Basics (2015) Logic in Python Try and Except

Mohammad Syed Raihaan
Mohammad Syed Raihaan
1,358 Points
Posted by Mohammad Syed Raihaan
Mohammad Syed Raihaan
1,358 Points

I'm not sure what this task wants me to do. Please help.

I'm confused on what Task 3 expects from me. What should I exactly do to pass this task? And please explain the 'try' and 'except' blocks.

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

1 Answer

Pete P
Pete P
7,613 Points
Pete P
Pete P
7,613 Points

You're very close. Inside of the try block, you should be converting x and y into floats.

def add(x,y):
    try: 
        #  Convert x and y into floats here
    except ValueError:
        return None
    else:
        return x + y

The try block will fail if x or y is say, a string like 'Treehouse'. The exception will then be raised and 'None' will be returned. However, if the conversion is a success, the exception will be skipped over and you can simply return x + y.

Hope this helps. Let me know if you're still having trouble.