Python - 在正则表达式中使用变量

Question

当我运行下面的代码时，我没有得到预期的输出。请纠正我..

import socket
import re
NodeName=socket.gethostname()
change_hostname_list=['/etc/hosts1','/etc/sysconfig/network1']
for file in change_hostname_list:
        infile=open(file,'r').read()
        print NodeName
        print file
        if re.search('NodeName',file):
                print "DOOO"

我需要输出“DOOO”

我得到下面的，

root@test06> python test.py
test06
/etc/hosts1
test06
/etc/sysconfig/network1
root@test06>

Answer 1

替换这个:

if re.search('NodeName',file):

到:

if re.search(NodeName,infile):

变量不需要引号，文件变量是列表中的文件名，变量文件是文件的内容。

这是演示:

>>> import socket
>>> import re
>>> f = open('/etc/hosts')
>>> host_name =  socket.gethostname()
>>> host_name
'hackaholic'
>>> for x in f:
...     print(x)
...     if re.search(host_name,x):
...         print("found")
... 
127.0.0.1   localhost

127.0.0.1   hackaholic

found     # it founds the host name in file
# The following lines are desirable for IPv6 capable hosts

::1     localhost ip6-localhost ip6-loopback

ff02::1 ip6-allnodes

ff02::2 ip6-allrouters