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

[Alexander Q.]

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)


Any suggestions as to what is going on? When I run it, it prompts me for
the number of sides, and that's it.
Thanks.
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