Python &引用；应为字符串或缓冲区“；

我有以下代码：

x=os.system("host www.google.com")
b=re.findall(r'\w',x)
print b  

但这将返回以下错误：

TypeError: expected string or buffer  

中的返回值是进程的退出代码。这是一个整数，不是字符串，所以基本上是这样做的：

>>> re.findall(r'\w', 0)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/re.py", line 177, in findall
    return _compile(pattern, flags).findall(string)
TypeError: expected string or buffer

---

给我们一个关于您正在使用的环境的提示。完整堆栈跟踪。和

>>> import subprocess
>>> print subprocess.check_output(['host',  'www.google.com'])
www.google.com has address 173.194.75.147
www.google.com has address 173.194.75.99
www.google.com has address 173.194.75.103
www.google.com has address 173.194.75.104
www.google.com has address 173.194.75.105
www.google.com has address 173.194.75.106
www.google.com has IPv6 address 2607:f8b0:400c:c03::6a