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

andhika pratikto
andhika pratikto
995 Points
Posted by andhika pratikto
andhika pratikto
995 Points

try and except

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.

can someone tell me what i did wrong

trial.py 
def add(num1, num2):
try:
    a = float(num1)
    b = float(num2)
except ValueError:
    return None
else:
    return(a+b)

2 Answers

Jennifer Nordell
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STAFF
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Jennifer Nordell
Treehouse Teacher
Jennifer Nordell
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Jennifer Nordell
Treehouse Teacher

Hi there! You're super close here. In a word? Indentation. Every line below the def add(num1, num2): should be indented once to the right. Remember that only things indented under the definition of the function will be considered part of the function.

Hope this helps! :sparkles:

andhika pratikto
andhika pratikto
995 Points
andhika pratikto
andhika pratikto
995 Points

Ahh thank you! You're awesome!

Christian A. Castro
Christian A. Castro
30,501 Points
Christian A. Castro
Christian A. Castro
30,501 Points

Jennifer Nordell Any idea what I might be placing wrong? :/

def add(a,b):
    try:
    return float(a) + float(b)
    except ValueError:
    return None
    else:
        return float(a) + float(b)
Michael Hulet
Michael Hulet
47,913 Points
Michael Hulet
Michael Hulet
47,913 Points

She means that everything under the definition in OP's question should keep its current indentation structure, but should be indented once more than it is. Your code will interpret without error once you format it as such

Jennifer Nordell
seal-mask
.a{fill-rule:evenodd;}techdegree
Jennifer Nordell
Treehouse Teacher
Jennifer Nordell
.a{fill-rule:evenodd;}techdegree
Jennifer Nordell
Treehouse Teacher

Christian A. Castro Hi there! Your first two return statements are not indented inside their blocks. The try is the start of a block. The except is the start of a block and the else if the start of a block. All your return statements should line up with where your last return statement is currently :sparkles:

Christian A. Castro
Christian A. Castro
30,501 Points
Christian A. Castro
Christian A. Castro
30,501 Points

Jennifer Nordell Thank you so much!!!! I just marked your answer :D