python ssh连接

import paramiko

def fw_exec(self, command):
    def fw_exec(self, command):
    FW_USER = ''
    FW_PASSWD = ''
    FW_HOST = ''


    paramiko.util.log_to_file('paramiko_log.txt')
    ssh=paramiko.SSHClient()
    ssh.load_system_host_keys()
    ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
    ssh.connect(FW_HOST,port=22,username=FW_USER,password=FW_PASSWD,compress=True)
    stdin, stdout, stderr = ssh.exec_command(command)
    logtxt = stdout.read()
    print logtxt
    ssh.close()gtxt
    ssh.close()