How to display isometric maps with pytmx?

[Piethon]

Hello.

I just thought, that in my code is a grid.
In my settings file, there are the following things:

WIDTH = 1024   
HEIGHT = 768
TILESIZE = 64
GRIDWIDTH = WIDTH / TILESIZE
GRIDHEIGHT = HEIGHT / TILESIZE

Probably I could change these numbers, to make an isometric grid. But I don't know how to change them. Do you think that could solve my problem?

Thanks for your help.
Piethon