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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 is_available(self):
 """Determine if the Cuckoo Sandbox API servers are alive or in maintenance mode. :rtype: bool :return: True if service is available, False otherwise. """

        # if the availability flag is raised, return True immediately.
        # NOTE: subsequent API failures will lower this flag. we do this here
        # to ensure we don't keep hitting Cuckoo with requests while
        # availability is there.
        if self.server_available:
            return True

        # otherwise, we have to check with the cloud.
        else:
            try:
                response = self._request("cuckoo/status")

                # we've got cuckoo.
                if response.status_code == 200:
                    self.server_available = True
                    return True

            except sandboxapi.SandboxError:
                pass

        self.server_available = False
        return False