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

Posted by Frank Scarfone
Frank Scarfone
Courses Plus Student 2,501 Points

I'm not sure what i'm doing wrong on this challenge.

I don't know if we were supposed to create an input to get the numbers? It doesn't say that we need to, but I can't get the correct answer here. If anyone can explain what i'm doing wrong, i'd appreciate it.

Thanksm

trial.py 
def add(one, two):
  try:
    one = float(one)
    two = float(two)
  except ValueError:
    return ("None.")
  else:
    return (one + two)

ad = add(3,3)
print(ad)

1 Answer

Steven Parker
Steven Parker
229,608 Points
Steven Parker
Steven Parker
229,608 Points

You're really close! Here are a few hints:

  • for the challenge, just define the function, don't call it yourself
  • you also won't need to print anything
  • None is a special Python keyword. Don't add a period or put quotes around it (that makes it an ordinary string).
  • FYI: you don't need parentheses after a return (but they don't hurt anything)
Frank Scarfone
Frank Scarfone
Courses Plus Student 2,501 Points

ahh! Thank you. I got it now.

Philip Ollas
Philip Ollas
5,705 Points

Hi Steven, got the same error as Frank here but I'm not sure why since I've wrote it in the right manner

def add(one,two):

try:

numbers = float(one) + float(two)

except ValueError: return None else: return numbers