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Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today. # How to check if an argument of a function is an integer?

Struggling with this challenge. It works without the first line: def add(arg1, arg2): but I think it must be there. Also not sure if I have to use input at all as the arguments may come from anywhere else. There is also some issue with "return(None)" I think

trial.py
```def add(arg1, arg2):
try:
arg1 = int(input("Enter your first digit: "))
arg2 = int(input("Enter your second digit: "))
except ValueError:
return(None)
else:
return(float(arg1) + float(arg2))
``` Remember that the arguments are being passed in to the function, you won't need to input them, and since this challenge is all about floats, checking for or converting to integers will not be used.

Just move your float-add-return line into the try block, and you won't need an else. So it would look like this:

```def add(arg1, arg2):
try:
return(float(arg1) + float(arg2))
except ValueError:
return(None)
``` MOD

```isinstance( <var>, int )
```

The longer answer is, for this challenge, you don't have to use the `input()` function. The challenge grader will provide arguments when calling the function.

The other change is to convert to `float` instead of `int`

Edit: change to `float` from `int`

```        arg1 = int(input("Enter your first digit: "))
arg2 = int(input("Enter your second digit: "))
# to
arg1 = float(arg1)
arg2 = float(arg2)
```

If you wanted to test your code, you can call the function with arguments:

```add(5, 2)
``` Thanks Chris, that is something I tried as well before but for some reason, it did not work:

```def add(arg1, arg2):
try:
arg1 = int(arg1)
arg2 = int(arg2)
except ValueError:
return(None)
else:
return(float(arg1) + float(arg2))
```

Is this what you mean? I've corrected my answer to use `float`. If `int` were used then actual `float` arguments would be converted to `int` first then back to `float` losing information.

Also, the conversion to `float only needs to happen once making the`return` simple

```def add(arg1, arg2):
Note `return` does not need the parens.