我正在尝试从 SFTP 服务器下载一些文件。我使用这个代码：keydata = b"""AAAAB3Nza.............CNpvoUP7p"""key = paramiko.RSAKey(data=decodebytes(keydata))cnopts = pysftp.CnOpts()cnopts.hostkeys.add(host, 'ssh-rsa', key)host = 'sftp.foo.com'username = 'test'password = 'test'with pysftp.Connection(host=host, username=username, password=password, cnopts=cnopts) as sftp: sftp.listdir() .....但我收到以下错误：Exception raised: Traceback (most recent call last): File "/home/myuser/src/ftp-data/ftp_data/downloader_v2.py", line 25, in main sftp.listdir() File "/home/myuser/environments/python3.5.2_ubuntu16.04/lib/python3.5/site-packages/pysftp/__init__.py", line 591, in listdir self._sftp_connect() File "/home/myuser/environments/python3.5.2_ubuntu16.04/lib/python3.5/site-packages/pysftp/__init__.py", line 205, in _sftp_connect self._sftp = paramiko.SFTPClient.from_transport(self._transport) File "/home/myuser/environments/python3.5.2_ubuntu16.04/lib/python3.5/site-packages/paramiko/sftp_client.py", line 165, in from_transport window_size=window_size, max_packet_size=max_packet_size File "/home/myuser/environments/python3.5.2_ubuntu16.04/lib/python3.5/site-packages/paramiko/transport.py", line 879, in open_session timeout=timeout, File "/home/myuser/environments/python3.5.2_ubuntu16.04/lib/python3.5/site-packages/paramiko/transport.py", line 1006, in open_channel raise e File "/home/myuser/environments/python3.5.2_ubuntu16.04/lib/python3.5/site-packages/paramiko/transport.py", line 2055, in run ptype, m = self.packetizer.read_message() File "/home/myuser/environments/python3.5.2_ubuntu16.04/lib/python3.5/site-packages/paramiko/packet.py", line 459, in read_message header = self.read_all(self.__block_size_in, check_rekey=True) raise EOFError() EOFError相同的代码可以在我尝试过的其他 SFTP 主机上正常运行。我还可以使用命令行（Ubuntu）正确下载文件sftp。listdir()如果我替换为pwd()or cd().... ，我会得到同样的错误。我使用以下版本：paramiko==2.7.2 和 pysftp==0.2.9我在这里缺少什么？
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