def get_mongo_version(self):
        if self._mongo_version:
            return self._mongo_version

        mongo_version = self.read_current_mongo_version()

        if not mongo_version:
            mongo_version = self.get_configured_mongo_version()

        self._mongo_version = mongo_version

        return self._mongo_version

    ###########################################################################
Gets mongo version of the server if it is running. Otherwise return
dataset/ETHPy150Open mongolab/mongoctl/mongoctl/objects/server.py/Server.get_mongo_version