我正在嘗試使用該Fabric模塊作為一組向兩個樹莓派運行命令。我正在嘗試學習如何使用該Group方法，但是我認為我做錯了某些事情，因為當我運行以下代碼時：...import fabricb = fabric.connection.Connection("192.168.3.151", port=22, user="pi", \    connect_kwargs={"password" : "Raspberry"})c = fabric.connection.Connection("192.168.3.123", port=22, user="pi", \    connect_kwargs={"password" : "Raspberry"})pool = fabric.group.SerialGroup(b, c)pool.run("touch /home/pi/Desktop/new_file65.txt")pool.close()print("hi")我收到以下錯誤：Traceback (most recent call last):  File "/home/pi/.local/lib/python3.5/site-packages/invoke/config.py", line 98, in __getattr__    return self._get(key)  File "/home/pi/.local/lib/python3.5/site-packages/invoke/config.py", line 165, in _get    value = self._config[key]  File "/home/pi/.local/lib/python3.5/site-packages/invoke/config.py", line 154, in __getitem__    return self._get(key)  File "/home/pi/.local/lib/python3.5/site-packages/invoke/config.py", line 165, in _get    value = self._config[key]KeyError: 'rsplit'During handling of the above exception, another exception occurred:Traceback (most recent call last):  File "test.py", line 7, in <module>    pool = fabric.group.ThreadingGroup(b, c)  File "/home/pi/.local/lib/python3.5/site-packages/fabric/group.py", line 70, in __init__    self.extend(map(Connection, hosts))  File "/home/pi/.local/lib/python3.5/site-packages/fabric/connection.py", line 246, in __init__    shorthand = self.derive_shorthand(host)  File "/home/pi/.local/lib/python3.5/site-packages/fabric/connection.py", line 416, in derive_shorthand    user_hostport = host_string.rsplit("@", 1)  File "/home/pi/.local/lib/python3.5/site-packages/invoke/config.py", line 110, in __getattr__    raise AttributeError(err)AttributeError: No attribute or config key found for 'rsplit'Valid keys: ['connect_kwargs', 'forward_agent', 'gateway', 'load_ssh_configs', 'port', 'run', 'runners', 'ssh_config_path', 'sudo', 'tasks', 'timeouts', 'user']我想我犯了一個簡單的錯誤，希望對分組連接的任何指導！謝謝！