当我尝试使用paramiko模块时，它会返回错误。我试过安装悬崖/蟒蛇悬崖模块但是还没有解决问题。我也遵循了这里的建议：Python pip install request[security] have error没有成功。有谁知道如何做到这一点？感谢。
import paramiko
paramiko.util.log_to_file("filename.log")
def connect():
client=paramiko.SSHClient()
client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
client.connect('192.168.0.100',username='XXX',password='XXX')
chan = client.get_transport().open_session()
chan.send("Hello")
print chan.recv(1024)
connect()
以下是错误日志：
DEB [20160703-06:53:33.249] thr=1 paramiko.transport: starting thread (client mode): 0xb53dd250L
DEB [20160703-06:53:33.249] thr=1 paramiko.transport: Local version/idstring: SSH-2.0-paramiko_2.0.1
DEB [20160703-06:53:33.305] thr=1 paramiko.transport: Remote version/idstring: SSH-2.0-paramiko_1.15.3
INF [20160703-06:53:33.305] thr=1 paramiko.transport: Connected (version 2.0, client paramiko_1.15.3)
DEB [20160703-06:53:33.306] thr=1 paramiko.transport: kex algos:[u'diffie-hellman-group14-sha1', u'diffie-hellman-group-exchange-sha1', u'diffie-hellman-group1-sha1'] server key:[u'ssh-rsa'] client encrypt:[u'aes128-ctr', u'aes256-ctr', u'aes128-cbc', u'blowfish-cbc', u'aes256-cbc', u'3des-cbc', u'arcfour128', u'arcfour256'] server encrypt:[u'aes128-ctr', u'aes256-ctr', u'aes128-cbc', u'blowfish-cbc', u'aes256-cbc', u'3des-cbc', u'arcfour128', u'arcfour256'] client mac:[u'hmac-sha1', u'hmac-md5', u'hmac-sha1-96', u'hmac-md5-96'] server mac:[u'hmac-sha1', u'hmac-md5', u'hmac-sha1-96', u'hmac-md5-96'] client compress:[u'none'] server compress:[u'none'] client lang:[u''] server lang:[u''] kex follows?False
DEB [20160703-06:53:33.306] thr=1 paramiko.transport: Kex agreed: diffie-hellman-group1-sha1
DEB [20160703-06:53:33.306] thr=1 paramiko.transport: Cipher agreed: aes128-ctr
DEB [20160703-06:53:33.306] thr=1 paramiko.transport: MAC agreed: hmac-md5
DEB [20160703-06:53:33.306] thr=1 paramiko.transport: Compression agreed: none
ERR [20160703-06:53:33.350] thr=1 paramiko.transport: Unknown exception: No module named _cffi_backend
ERR [20160703-06:53:33.353] thr=1 paramiko.transport: Traceback (most recent call last):
ERR [20160703-06:53:33.353] thr=1 paramiko.transport: File "/usr/local/lib/python2.7/dist-packages/paramiko/transport.py", line 1772, in run
ERR [20160703-06:53:33.353] thr=1 paramiko.transport: self.kex_engine.parse_next(ptype, m)
ERR [20160703-06:53:33.353] thr=1 paramiko.transport: File "/usr/local/lib/python2.7/dist-packages/paramiko/kex_group1.py", line 75, in parse_next
ERR [20160703-06:53:33.353] thr=1 paramiko.transport: return self._parse_kexdh_reply(m)
ERR [20160703-06:53:33.353] thr=1 paramiko.transport: File "/usr/local/lib/python2.7/dist-packages/paramiko/kex_group1.py", line 111, in _parse_kexdh_reply
ERR [20160703-06:53:33.353] thr=1 paramiko.transport: self.transport._verify_key(host_key, sig)
ERR [20160703-06:53:33.353] thr=1 paramiko.transport: File "/usr/local/lib/python2.7/dist-packages/paramiko/transport.py", line 1617, in _verify_key
ERR [20160703-06:53:33.353] thr=1 paramiko.transport: key = self._key_info[self.host_key_type](Message(host_key))
ERR [20160703-06:53:33.353] thr=1 paramiko.transport: File "/usr/local/lib/python2.7/dist-packages/paramiko/rsakey.py", line 58, in __init__
ERR [20160703-06:53:33.353] thr=1 paramiko.transport: ).public_key(default_backend())
ERR [20160703-06:53:33.353] thr=1 paramiko.transport: File "/usr/local/lib/python2.7/dist-packages/cryptography/hazmat/backends/__init__.py", line 35, in default_backend
ERR [20160703-06:53:33.353] thr=1 paramiko.transport: _default_backend = MultiBackend(_available_backends())
ERR [20160703-06:53:33.353] thr=1 paramiko.transport: File "/usr/local/lib/python2.7/dist-packages/cryptography/hazmat/backends/__init__.py", line 22, in _available_backends
ERR [20160703-06:53:33.353] thr=1 paramiko.transport: "cryptography.backends"
ERR [20160703-06:53:33.353] thr=1 paramiko.transport: File "/usr/local/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2235, in resolve
ERR [20160703-06:53:33.353] thr=1 paramiko.transport: module = __import__(self.module_name, fromlist=['__name__'], level=0)
ERR [20160703-06:53:33.354] thr=1 paramiko.transport: File "/usr/local/lib/python2.7/dist-packages/cryptography/hazmat/backends/openssl/__init__.py", line 7, in <module>
ERR [20160703-06:53:33.354] thr=1 paramiko.transport: from cryptography.hazmat.backends.openssl.backend import backend
ERR [20160703-06:53:33.354] thr=1 paramiko.transport: File "/usr/local/lib/python2.7/dist-packages/cryptography/hazmat/backends/openssl/backend.py", line 15, in <module>
ERR [20160703-06:53:33.354] thr=1 paramiko.transport: from cryptography import utils, x509
ERR [20160703-06:53:33.354] thr=1 paramiko.transport: File "/usr/local/lib/python2.7/dist-packages/cryptography/x509/__init__.py", line 7, in <module>
ERR [20160703-06:53:33.354] thr=1 paramiko.transport: from cryptography.x509.base import (
ERR [20160703-06:53:33.354] thr=1 paramiko.transport: File "/usr/local/lib/python2.7/dist-packages/cryptography/x509/base.py", line 15, in <module>
ERR [20160703-06:53:33.354] thr=1 paramiko.transport: from cryptography.x509.extensions import Extension, ExtensionType
ERR [20160703-06:53:33.354] thr=1 paramiko.transport: File "/usr/local/lib/python2.7/dist-packages/cryptography/x509/extensions.py", line 19, in <module>
ERR [20160703-06:53:33.354] thr=1 paramiko.transport: from cryptography.hazmat.primitives import constant_time, serialization
ERR [20160703-06:53:33.354] thr=1 paramiko.transport: File "/usr/local/lib/python2.7/dist-packages/cryptography/hazmat/primitives/constant_time.py", line 9, in <module>
ERR [20160703-06:53:33.358] thr=1 paramiko.transport: from cryptography.hazmat.bindings._constant_time import lib
ERR [20160703-06:53:33.358] thr=1 paramiko.transport: ImportError: No module named _cffi_backend
ERR [20160703-06:53:33.358] thr=1 paramiko.transport: