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

Anne Manning
Anne Manning
5,415 Points
Posted by Anne Manning
Anne Manning
5,415 Points

I don't know how to solve this assignment.

I am having trouble with the try and except blocks of code in challenge 3 of 3. any direction would be great.

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

3 Answers

Attila Farkas
Attila Farkas
9,323 Points
Attila Farkas
Attila Farkas
9,323 Points

One way to make your code work would be to move the try-except block inside the add function (you also don't need the else clause):

def add(a, b):
  try:
    fl_a = float(a)
    fl_b = float(b)
  except ValueError:
    return None
  return fl_a + fl_b
Anne Manning
Anne Manning
5,415 Points
Anne Manning
Anne Manning
5,415 Points

unfortunately, I am still getting the error message: "Bummer, try again"

Gianmarco Mazzoran
Gianmarco Mazzoran
22,076 Points
Gianmarco Mazzoran
Gianmarco Mazzoran
22,076 Points

Hi,

i think you're not passing the last task because it asking you to add the try: method before you convert your arguments into floats. In your code snippet you convert a and b and return them two times.

Instead you could do this to keep the things clean:

tryal.py 
def add(arg1, arg2):
    try:
        return float(arg1) + float(arg2)
    except ValueError:
        return None
Attila Farkas
Attila Farkas
9,323 Points
Attila Farkas
Attila Farkas
9,323 Points

Anne,

I just tried the code I suggested, and it passed the test. Make sure the indentation levels are consistent with the code above (try, except, last return lines must have same indentation).