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

Posted by Vu Doan
Vu Doan
2,957 Points

Can you help me with this code?

"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 you help me with the solution? Thanks!

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

add(2, 4)

1 Answer

Stuart McIntosh
seal-mask
.a{fill-rule:evenodd;}techdegree seal-36
Stuart McIntosh
Python Web Development Techdegree Graduate 22,874 Points
Stuart McIntosh
.a{fill-rule:evenodd;}techdegree seal-36
Stuart McIntosh
Python Web Development Techdegree Graduate 22,874 Points

Hi there, very nearly there. a few things:

  1. The try except should be part of the function add
  2. You dont need the first return
  3. The exception is called ValueError not ValueErrors 
def add(num1, num2):
    try:
        return float(num1) + float(num2) 
    except ValueError:
        return None

Hope this makes sense