Cleanup

    return (x_min + (x_max - x_min) / 2, y_min + (y_max - y_min) / 2,

            z_min + (z_max - z_min) / 2)

  def __hash__(self):

    """Implement hashing function for this box.

    Uses the default `hash` on `self.x_range, self.y_range,

    self.z_range`.

    Returns

    -------

    Unique integeer

    """

    return hash((self.x_range, self.y_range, self.z_range))

  def center(self):

    """Computes the center of this box.

    Returns

    -------

    `(x, y, z)` the coordinates of the center of the box.

    Examples

    --------

    >>> box = CoordinateBox((0, 1), (0, 1), (0, 1))

    >>> box.center()

    (0.5, 0.5, 0.5)

    """

    x_min, x_max = self.x_range

    y_min, y_max = self.y_range

    z_min, z_max = self.z_range

    return (x_min + (x_max-x_min)/2, y_min + (y_max-y_min)/2, z_min + (z_max-z_min)/2)

  def volume(self):

    """Computes and returns the volume of this box.