code: def set_map_alpha(alpha):
      """
      Alpha color of the map tiles
  
      :param alpha: int between 0 and 255. 0 is completely dark, 255 is full brightness
      """
      if alpha < 0 or alpha > 255:
          raise Exception("invalid alpha " + str(alpha))
      _global_config.map_alpha = alpha
  
imports: import base64
  import traceback
  import pyglet
  from geoplotlib.core import GeoplotlibApp
  from core import FONT_NAME
label_desc: Use image node_id 23 for calling a global function with example usage: set_map_alpha(alpha) without return types