def METHOD_NAME(self, dxyz):
    """ Move the atom3D by a displacement vector.
    Parameters
    ----------
        dxyz : list
            Displacement vector of length 3: [dx, dy, dz].
    """
    x, y, z = self.__xyz
    self.__xyz[0] = x + dxyz[0]
    self.__xyz[1] = y + dxyz[1]
    self.__xyz[2] = z + dxyz[2]