docs: def _font(size):
          """
              Returns a PIL ImageFont instance.
              :param size: size of the avatar, in pixels
          """
          # path = '/usr/share/fonts/wenquanyi/wqy-microhei/wqy-microhei.ttc'
          path = os.path.join(
              os.path.dirname(__file__), 'data', "wqy-microhei.ttc")
          return ImageFont.truetype(path, size=int(0.65 * size), index=0)