[英]file.write() in python
import os
import sys
import re
import string
f=open('./iprange','r')
s=f.readline()
f.close()
pattern='inet addr:'+s
pattern=pattern.split('x')[0]
pattern='('+pattern+'...'+')'
os.system('ifconfig -a >> interfaces')
f=open('./interfaces','r')
s=f.readline()
while (len(s))!=0:
i=re.search(pattern,s)
if i!=None:
sp=re.split(pattern,s)[1]
ip=re.split('inet addr:',sp)[1]
break
s=f.readline()
f.close()
os.system('rm ./interfaces')
f=open('./userip','w')
f.write(ip)
f.close()
NameError;name 'ip' is not defined
I split pattern
by s
and store the result in sp
, then I find the IP address and store the result in ip
. 我用s
分割pattern
并将结果存储在sp
,然后找到IP地址并将结果存储在ip
。 But the error says ip
is not defined - what's going on? 但是错误显示ip
未定义-怎么回事?
while (len(s))!=0:
i=re.search(pattern,s)
if i!=None:
sp=re.split(pattern,s)[1]
ip=re.split('inet addr:',sp)[1]
break
s=f.readline()
The ip assignment is inside the if closure, which is apparently never being executed. ip赋值位于if闭包内部,这显然从未执行过。
I'd do something more like this: 我会做更多这样的事情:
import os
import sys
import re
from itertools import takewhile
with open('./iprange','r') as f:
s = f.readline()
prefix = 'inet addr:'
pattern = prefix + s
pattern = pattern.split('x')[0]
pattern = '(%s...)' % pattern
os.system('ifconfig -a >> interfaces')
with open('interfaces', 'r') as f:
# Put all lines up to the first empty line into a list
# http://docs.python.org/2/library/itertools.html#itertools.takewhile
# `[line.rstrip() for line in f]` could be a generator instead:
# (line.rstrip() for line in f)
lines = list(takewhile(lambda x: x, [line.rstrip() for line in f]))
os.remove('interfaces')
for s in lines:
if re.search(pattern, s):
sp = re.split(pattern, s)[1]
ip = sp[len(prefix):]
with open('./userip', 'w') as f:
f.write(ip)
break
else:
print "No match found"
For one thing, you only write to the file userip
if you find a match and you get a message if no match was found. 一方面,仅当找到匹配项时才写入文件userip
如果找不到匹配项,则会收到一条消息。
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