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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def xyz_with_ports(self):
 """Return all particle coordinates in this compound including ports. Returns ------- pos : np.ndarray, shape=(n, 3), dtype=float Array with the positions of all particles and ports. """

        if not self.children:
            pos = self._pos
        else:
            arr = np.fromiter(
                itertools.chain.from_iterable(
                    particle.pos for particle in self.particles(
                        include_ports=True)), dtype=float)
            pos = arr.reshape((-1, 3))
        return pos