[Tutor] Calling a function does not return what I want it to return

[Prasad, Ramit]

> I have this little program that is supposed to calculate how many diagonals a
> polygon of x sides has, but it does not return what I have in the "return"
> part of the function when I call it. Here is the code:
> 
> def num_diag(var):
>   ans = 0
>   if var <= 3:
>     print("No diagonals.")
>   else:
>     for i in range(num_sides - 3):
>       ans = ans + i
> 
>   return (((var - 3)*2) + ans)
> 
> num_sides = (int(raw_input("Enter sides: ")))
> num_diag(num_sides)
>


>>> num_diag(5)
NameError: global name 'num_sides' is not defined


`for i in range(num_sides - 3):`
Change num_sides to var.

Ramit

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