Pygame TypeError: python.surface object unsubscriptable

[Mahem Ones]

I am trying to run some pygame code and get this error:
Pygame TypeError: python.surface object unsubscriptable
Here is the code:

ball1 = [ 100 ,50 , 1, 0]

def ball (x,y,movex,movey):
    if x < 0 :
        x * -1
    if x > 580:
        x= x* -1
    if y < 0:
        y = y* -1
    if y > 260:
        y = y*-1

    x+= movex
    y+= movey
    
    return x ,y

  ball1x = ball1 [0]
  ball1y = ball1 [1]
  ball1x ,ball1y  = ball( ball1x, ball1y  ,1 ,0 )

Note: Obviously this isn't all the code.

The function will work with real number though.i.e

ball1x , ball1y = ball ( 10 , 450, 1 ,0)

But it can't assign to an item in a list.

ball1 [0], ball1 [1] = ball( 10, 405, 1 ,0 )

Are these just pygame restrictions? Or am I doing something wrong?


Also, everytime I get an error like this after I create the pygame window I can't close the window and it become unresponsive.
I there any fix to that?

thank!

mahem1