from sh import ssh
PASS = 'xxxx'
def ssh_interact(line, stdin):
  line = line.strip()
  print(line)
  if line.endswith('password:'):
    stdin.put(PASS)
ssh('x.x.x.x', _out=ssh_interact)

# coding: utf-8
import os.path

from paramiko import SSHClient, AutoAddPolicy, AuthenticationException


class ConnectError(Exception):
  """
  连接错误时抛出的异常
  """
  pass

class RemoteExecError(Exception):
  """
  远程执行命令，失败时抛出的异常
  """
  pass

class SCPError(Exception):
  """
  远程下发文件时抛出的异常
  """
  pass

...
class Remote(object):
  def __init__(self, host, username, password=None, port=22, key_filename=None):
    self.host = host
    self.username = username
    self.password = password
    self.port = port
    self.key_filename = key_filename
    self._ssh = None

  def _connect(self):
    self._ssh = SSHClient()
    self._ssh.set_missing_host_key_policy(AutoAddPolicy())
    try:
      if self.key_filename:
        self._ssh.connect(self.host, username=self.username, port=self.port, key_filename=self.key_filename)
      else:
        self._ssh.connect(self.host, username=self.username, password=self.password, port=self.port)
    except AuthenticationException: 
      self._ssh = None
      raise ConnectionError('连接失败，请确认用户名、密码、端口或密钥文件是否有效')
    except Exception as e:
      self._ssh = None
      raise ConnectionError('连接时出现意料外的错误：%s' % e)

  def get_ssh(self):
    if not self._ssh:
      self._connect()
    return self._ssh

class Remote(object):
  ...
  def ssh(self, cmd, root_password=None, get_pty=False, super=False):
    cmd = self._prepare_cmd(cmd, root_password， super)
    stdout = self._exec(cmd, get_pty)
    return stdout

  def _prepare_cmd(self, cmd, root_password=None, super=False):
    if self.username != 'root' and super:
      if root_password:
        cmd = "echo '{}'|su - root -c '{}'".format(root_password, cmd)
      else:
        cmd = "echo '{}'|sudo -p '' -S su - root -c '{}'".format(self.password, cmd)
    return cmd

  def _exec(self, cmd, gty_pty=False):
    channel = self.get_ssh().get_transport().open_session()
    if get_pty:
      channel.get_pty()
    channel.exec_command(cmd)
    stdout = channel.makefile('r', -1).readlines()
    stderr = channel.makefile_stderr('r', -1).readlines()
    ret_code = channel.recv_exit_status()
    if ret_code:
      msg = ''.join(stderr) if stderr else ''.join(stdout)
      raise RemoteExecError(msg)
    return stdout

class Remote(object):
  ...

  def scp(self, local_file, remote_path):
    if not os.path.exists(local_file):
      raise SCPError("Local %s isn't exists" % local_file)
    if not os.path.isfile(local_file):
      raise SCPError("%s is not a File" % local_file)
    sftp = self.get_ssh().open_sftp()
    try:
      sftp.put(local_file, remote_path)
    except Exception as e:
      raise SCPError(e)

# coding: utf-8
from remote_client import RemoteClient

rc = RemoteClient('10.1.100.1', 'test', 'test_pass')
rc.ssh('whoami')  # [u'test\n']
rc.scp('/tmp/test.out', '/tmp/test.out')