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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 get_local_addr(self, timeout=None):
 """ Retrieve the current local address. :param timeout: If not given or given as ``None``, waits until the local address is available. Otherwise, waits for as long as specified. If the local address is not set by the time the timeout expires, returns ``None``. """


        # If we're not running, just return None
        if not self.running:
            return None

        # OK, we're running; wait on the _local_addr_event
        if not self._local_addr_event.wait(timeout):
            # Still not set after timeout
            return None

        # We have a local address!
        return self._local_addr