TypeError: 'str' object is not callable

centos 6.5X64 python2.6.6 代码如下： #!/usr/bin/env python # -*- coding: utf-8 -*- import os un_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.py tar -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？