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

Kevin Lankford
Kevin Lankford
1,983 Points
Posted by Kevin Lankford
Kevin Lankford
1,983 Points

example saying my code is returning the wrong results

I've created several different permutations of this code but I'm not finding success. In my initial solution I created:

def add(a,b):

return float(a + b)

but I seem to be getting a ValueError saying a multi decimal is not working. That prompted me to add an exception and write the code like so:

def add(a,b):

try:
     return float(a + b)
except ValueError:
     print("invalid input")

I'm not quite understanding why it's telling me add is returning the wrong results if its converting it into a float. Any help is appreciated!

trial.py 
def add(a,b):

    try:
        c = float(a + b)
    except ValueError:
        print("invalid input")

    else:
        return c
jonlunsford
jonlunsford
15,480 Points
jonlunsford
jonlunsford
15,480 Points

Kevin: The task may be looking for an integer number instead of a float. Try something like this.... it seemed to work fine for me.

def add(num1, num2):
    return num1 + num2

3 Answers

jonlunsford
jonlunsford
15,480 Points
jonlunsford
jonlunsford
15,480 Points

Kevin: The task may be looking for an integer number instead of a float. Try something like this.... it seemed to work fine for me.

def add(num1, num2):
return num1 + num2
Kevin Lankford
Kevin Lankford
1,983 Points
Kevin Lankford
Kevin Lankford
1,983 Points

the next step of the task is specifically asking for the arguments to be casted into floats before they are returned. At first I wrote this:

def add(a,b):

return float(a + b)

But that did not work, it said the value (perhaps that is was tested with) was not correct (it had multiple decimals (like 234.45.1). I then tried this:

try: c = float(a + b) except ValueError: print("invalid input")

else:
    return c

To send an exception for any invalid input. With this I get the error: 'add` returned the wrong results.

Julian Garcia
Julian Garcia
18,380 Points
Julian Garcia
Julian Garcia
18,380 Points

1) try converting numbers to float one by one try:

  a=float(a)
  b=float(b)

then sum both in else block.

2) In except block they ask for return None: Try this:

    except ValueError:
        return None

Instead:

    except ValueError:
        print("invalid input")