Python os.system的结果不能赋值到变量

今天在学习python os模块的system方法时，发现不能赋值给变量，具体操作如下 [

Screenshot from 2015-09-15 22:45:23](https://qcloud.coding.net/u/guomaoqiu/p/guomaoqiu/git/raw/master/uploads/2015/09/Screenshot-from-2015-09-15-224523.png)

后来查询得知有更新的模块，如下：

os.system
os.spawn
os.popen
popen2.
commands.

重新使用a = os.popen(‘df -hT’).read() 就能获取到啦。 [

Screenshot from 2015-09-15 22:50:38](https://qcloud.coding.net/u/guomaoqiu/p/guomaoqiu/git/raw/master/uploads/2015/09/Screenshot-from-2015-09-15-225038.png)