TypeError: 'str' object is not callable

Question

centos 6.5X64 python2.6.6代码如下：#!/usr/bin/env python# -*- coding: utf-8 -*-import osun_tar = ["hbase-1.2.2-bin.tar.gz","spark-2.0.0-bin-hadoop2.6.tgz","apache-hive-2.1.0-bin.tar.gz",          "zookeeper-3.4.9.tar.gz","hadoop-2.6.4.tar.gz","scala-2.11.8.tgz"]install_home = '/usr/ADH/'java_install_home = '/usr/java/'java_file = "jdk-8u101-linux-x64.tar.gz"local_dir = "/root/"for f in un_tar:    print "tar -zxf {0} -C {1}".format(local_dir + f, install_home)    os.system("tar -zxf %s -C %s"(local_dir + f, install_home))执行时报错如下：[root@adh1 ~]# ./1.pytar -zxf /root/hbase-1.2.2-bin.tar.gz -C /usr/ADH/Traceback (most recent call last):  File "./1.py", line 16, in <module>    os.system("tar -zxf %s -C %s"(local_dir + f, install_home))TypeError: 'str' object is not callable自己也有搜了下，都是在说自己定义的变量名和python的底层函数名冲突的。但我这个可以确定是没有名称冲突的啊，用print打印出来发现linux命令也没错啊，这个要怎么破啊

Answer 1

少打了一个%

Answer 2

un_tar是元组，local_dir是str 这类型能一起连接么？