Draw TMX tiles in pygame and save them as an image

render_tmx.py

import pygame, pytmx, argparse

def draw_tmx(tmx, window):
  # For each layer
    for l in xrange(0, len(tmx.tilelayers)):
        # For each y tile coordinate
        for y in xrange(0, tmx.height):
            # For each x tile coordinate
            for x in xrange(0, tmx.width):
                # try not strictly necessary, but a hangover from some old bad code
                try:
                    tile = tmx.getTileImage(x, y, l)
                except Exception, e:
                    print e
                    continue
                # If there is no tile to draw, tile will be 0
                if tile:
                    x_pos = x * tmx.tilewidth
                    # pygame renders tiles from top left and Tiled renders them
                    # from bottom left. This means that if the tile image is
                    # taller than the tile height, pygame will draw it downwards
                    # instead.
                    y_pos = (y * tmx.tileheight) - tile.get_height() + tmx.tileheight
                    window.blit(tile, (x_pos, y_pos))

if __name__ == "__main__":
    p = argparse.ArgumentParser()
    p.add_argument("tmx_file")
    p.add_argument("output_file")
    args = p.parse_args()

    pygame.init()
    # We can't load_pygame yet because we haven't set our display up and we
    # can't do that until we've figured out what size it needs to be..
    tmx = pytmx.tmxloader.load_tmx(args.tmx_file)
    window = pygame.display.set_mode((
      tmx.width * tmx.tilewidth, tmx.height * tmx.tileheight))
    tmx = pytmx.tmxloader.load_pygame(args.tmx_file, pixelalpha=True)
    draw_tmx(tmx, window)
    pygame.display.flip()
    pygame.image.save(window, args.output_file)