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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 refresh(self, state=None):
 """Refreshes the state of this entity. If *state* is provided, load it as the new state for this entity. Otherwise, make a roundtrip to the server (by calling the :meth:`read` method of ``self``) to fetch an updated state, plus at most two additional round trips if the ``autologin`` field of :func:`connect` is set to ``True``. :param state: Entity-specific arguments (optional). :type state: ``dict`` :raises EntityDeletedException: Raised if the entity no longer exists on the server. **Example**:: import splunklib.client as client search = s.apps['search'] search.refresh() """

        if state is not None:
            self._state = state
        else:
            self._state = self.read(self.get())
        return self