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

Posted by Monica Dhulipudi
Monica Dhulipudi
4,075 Points

https://teamtreehouse.com/library/python-basics/logic-in-python/try-and-except

Hi can anyone solve this https://teamtreehouse.com/library/python-basics/logic-in-python/try-and-except

trial.py 
def add(new,old):
    try:
    a = float(new)
    b = float(old)
    total = a+b
    except ValueError:
        return None
    else:
    return total
add(1,1)

2 Answers

taejooncho
PLUS
taejooncho
Courses Plus Student 3,923 Points
taejooncho
taejooncho
Courses Plus Student 3,923 Points

you need to indent your code after try: and else: also, I think you need to write total = a+b after else:

Herman Brummer
Herman Brummer
6,414 Points
Herman Brummer
Herman Brummer
6,414 Points 
def add(a,b):
    try:
        float(a + b)
    except ValueError:
        return None
    else:
        return float(a + b)

Why does that not work?

taejooncho
taejooncho
Courses Plus Student 3,923 Points

because your code after try: is not what the task wants you to do. after try: you need make each interable a float using float function. not make result of (a + b) into float

Herman Brummer
Herman Brummer
6,414 Points
Herman Brummer
Herman Brummer
6,414 Points

Thanks, strange though coz that does work and is less verbose, or more pythonic, but I guess as you pointed out it is what this marking mechanism required.