[英]“expected string or buffer”
I have this code: 我有这个代码:
x=os.system("host www.google.com")
b=re.findall(r'\w',x)
print b
But this returns the following error: 但是这会返回以下错误:
TypeError: expected string or buffer
The return value from os.system is the exit code of the process. os.system的返回值是进程的退出代码。 This is an integer, not a string, so you're basically doing this:
这是一个整数,而不是一个字符串,所以你基本上是这样做的:
>>> 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
I think the function you're looking for is subprocess.check_output : 我认为您正在寻找的函数是subprocess.check_output :
>>> 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
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