code: def _bbox(nodes):
      
      left, bottom = np.min(nodes, axis=1)
      right, top = np.max(nodes, axis=1)
      return left, right, bottom, top
docs: Get the bounding box for set of points.
  
      .. note::
  
         There is also a Fortran implementation of this function, which
         will be used if it can be built.
  
      Args:
         nodes (numpy.ndarray): A set of points.
  
      Returns:
          Tuple[float, float, float, float]: The left, right,
          bottom and top bounds for the box.