Скрипт для выполнения ssh и sftp с использованием python, он не работает

Question

import paramiko
import os
import stat
import ConfigParser
import re
from paramiko_expect import SSHClientInteraction

class My_SSHConnect():
        def __init__(self, login_cred):
                ip, username, password, port=22
                ssh = paramiko.SSHClient()
                ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())

    def download_dir(remote_dir, local_dir):
            os.path.exists(local_dir) or os.makedirs(local_dir)
            dir_items = sftp.listdir_attr(remote_dir)
            for item in dir_items:
             # assuming the local system is Windows and the remote system is Linux
            # os.path.join won't help here, so construct remote_path manually
                    remote_path = remote_dir + '/' + item.filename
                    local_path = os.path.join(local_dir, item.filename)
            if S_ISDIR(item.st_mode):
                    download_dir(remote_path, local_path)
            else:
                    sftp.get(remote_path, local_path)


download_dir() = download_dir('/home/eeniqsup/Eric_auto/output','/home/ashutosh/eric_auto/raw_input')
login_cred = open(r'/home/ashutosh/SCTP_Parameter/login/cred.csv').readlines()

if __name__ == '__main__':
        Main()