python远程执行命令

import paramikodef sshclient_execmd(hostname, port, username, password, execmd):    paramiko.util.log_to_file("paramiko.log")    s = paramiko.SSHClient()    s.set_missing_host_key_policy(paramiko.AutoAddPolicy())    s.connect(hostname=hostname, port=port, username=username, password=password)    stdin, stdout, stderr = s.exec_command (execmd)    stdin.write("Y")    print stdout.read()    s.close()def main():    hostname = '192.168.56.11'    port = 22    username = 'root'    password = '123456'    execmd1 = "/root/tomcat/bin/stop.sh"    execmd2 = "/root/tomcat/bin/start.sh"    sshclient_execmd(hostname, port, username, password, execmd1)    sshclient_execmd(hostname, port, username, password, execmd2)if __name__ == "__main__":    main()