code: def spin(self, theta, around):
          
          around = np.asarray(around).reshape(3)
          center_pos = self.center
          self.translate(-center_pos)
          self.rotate(theta, around)
          self.translate(center_pos)
docs: Rotate Compound in place around an arbitrary vector.
  
          Parameters
          ----------
          theta : float
              The angle by which to rotate the Compound, in radians.
          around : np.ndarray, shape=(3,), dtype=float
              The axis about which to spin the Compound.