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

natalia iaroslavskaia
natalia iaroslavskaia
7,293 Points
Posted by natalia iaroslavskaia
natalia iaroslavskaia
7,293 Points

indentation for TRY block inside a function

What are the rules for inserting a TRY block into a function

trial.py 
def add(first, second):
        try:
            first=int(input("Give the first number"))
            second=int(input("Give the second number"))
        except ValueError:
             return None
        else:
            first=float(first)
             second=float(second)
            return first+second
Adam Ryde
Adam Ryde
5,222 Points
Adam Ryde
Adam Ryde
5,222 Points

im no expert by any means, but the indentation in your else block for second=float(second) looks one space to many... i dont know if this helps mate

2 Answers

james south
seal-mask
.a{fill-rule:evenodd;}techdegree seal-36
james south
Front End Web Development Techdegree Graduate 33,271 Points
james south
.a{fill-rule:evenodd;}techdegree seal-36
james south
Front End Web Development Techdegree Graduate 33,271 Points

indentation-wise, you are close. it should look like this:

def add(first, second):
    try:
        first=int(input("Give the first number"))
        second=int(input("Give the second number"))
    except ValueError:
        return None
    else:
        first=float(first)
        second=float(second)
        return first+second

that is, def statement at the left edge, try, except and else indented at the same level (here, 4 spaces), and then their respective bodies indented at the same level (here, 4 more spaces). this challenge does not ask for user input, so you need to remove that. the function takes 2 arguments, you have first and second, those are passed in when the function is called, no need to ask for user input. in the try block you are TRY-ing to cast them as floats. if it works, the else block executes, so return the sum. if the cast to float does not work, the except executes, return None.