ignore the comments before GRIDLINES = (. I am trying to make a tuple of start point and end points but it keeps the tuple can not be called on. I don’t know why and I would like some help.

1CELL_SIZE = 200 # This may be adjusted, depending on screen resolution

2

3 # Gridlines, two vertical and two horizontal, in (begin, end) format

4 GRIDLINES = (

5 (

6 (-CELL_SIZE/2, CELL_SIZE*3/2), # start point
7 (-CELL_SIZE/2, -CELL_SIZE*3/2) # end point

8 )

9 (

10 (CELL_SIZE/2, CELL_SIZE

*3/2), # start point*

11 (CELL_SIZE/2, -CELL_SIZE3/2) # end point

11 (CELL_SIZE/2, -CELL_SIZE

12 )

13 (

14 (-CELL_SIZE

*3/2, CELL_SIZE/2), # start point*

15 (CELL_SIZE3/2, CELL_SIZE/2) # end point

15 (CELL_SIZE

16 )

17 (

18 (-CELL_SIZE

*3/2, -CELL_SIZE/2), # start point*

19 (CELL_SIZE3/2, -CELL_SIZE/2) # end point

19 (CELL_SIZE

20 )

21 )