code: def heightmap_get_slope(hm: np.ndarray, x: int, y: int) -> float:
      
      return float(lib.TCOD_heightmap_get_slope(_heightmap_cdata(hm), x, y))
docs: Return the slope between 0 and (pi / 2) at given coordinates.
  
      Args:
          hm (numpy.ndarray): A numpy.ndarray formatted for heightmap functions.
          x (int): The x coordinate.
          y (int): The y coordinate.
  
      Returns:
          float: The steepness at ``x``, ``y``.  From 0 to (pi / 2)