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

Posted by vikas pal
vikas pal
11,563 Points

need help

this is my code please tell me where i do mistake

trial.py 
def add(x,y)
    try: 
        sum=return(float(x+y))
    except ValueError:
        return None
    else:
        return sum
add(5,5)

2 Answers

Jeff Hartl
seal-mask
.a{fill-rule:evenodd;}techdegree
Jeff Hartl
Python Web Development Techdegree Student 8,420 Points
Jeff Hartl
.a{fill-rule:evenodd;}techdegree
Jeff Hartl
Python Web Development Techdegree Student 8,420 Points
  1. When you define a function there should be a colon.
  2. sum=return(float(x+y) is incorrect. Should there really be a return statement on that line, since later in your code you are returning sum?
  3. Else statements cannot run without an if statement higher up in the block of code. Since you are using a try\except block, think about whether you really need an else statement.
  4. Could the function throw more exceptions than just a ValueError?
vikas pal
vikas pal
11,563 Points

thanks to sort out my doubt

Wairton Rebouças
Wairton Rebouças
8,225 Points
Wairton Rebouças
Wairton Rebouças
8,225 Points

Just one minor correction to Jeff Harti's answer. In python it is possible to use and else statement for exception handling, see section 8.3 of https://docs.python.org/3/tutorial/errors.html

The challenge asks the user to use an else statement for a try except block so, a valid answer would be:

def add(x,y):
    try: 
        total = float(x)+ float(y)
    except ValueError:
        return None
    else:
        return total

note that the challenge asks you to convert to float before the sum