On 2013-02-14 14:13, python wrote:
my tv.txt is :
http://202.177.192.119/radio5 香港电台第五台(可于Totem/VLC/MPlayer播放)
http://202.177.192.119/radio35 香港电台第五台(DAB版，可于Totem/VLC/MPlayer播放)
http://202.177.192.119/radiopth 香港电台普通话台(可于Totem/VLC/MPlayer播放)
http://202.177.192.119/radio31 香港电台普通话台(DAB版，可于Totem/VLC/MPlayer播放)
octoshape:rthk.ch1 香港电台第一台(粤)
octoshape:rthk.ch2 香港电台第二台(粤)
octoshape:rthk.ch6 香港电台普通话台
octoshape:rthk.ch3 香港电台第三台(英)
what i want to get the result is
1group is http://202.177.192.119/radio5 2group is 香港电台第五台 3group is
(可于Totem/VLC/MPlayer播放)
1group is http://202.177.192.119/radio35 2group is 香港电台第五台 3group is
(DAB版，可于Totem/VLC/MPlayer播放)
1group is http://202.177.192.119/radiopth 2group is 香港电台普通话台 3group is
(可于Totem/VLC/MPlayer播放)
1group is http://202.177.192.119/radio31 2group is 香港电台普通话台 3group is
(DAB版，可于Totem/VLC/MPlayer播放)
1group is octoshape:rthk.ch1 2group is 香港电台第一台 3group is (粤)
1group is octoshape:rthk.ch2 2group is 香港电台第二台 3group is (粤)
1group is octoshape:rthk.ch6 2group is 香港电台普通话台 3group is none
1group is octoshape:rthk.ch3 2group is 香港电台第三台 3group is (英)
>
here is my code:
# -*- coding: utf-8 -*-
import re
rfile=open("tv.txt","r")
pat='([a-z].+?\s)(.+)(\(.+\))'
for line in rfile.readlines():
Match=re.match(pat,line)
print "1group is ",Match.group(1),"2group is
",Match.group(2),"3group is ",Match.group(3)
rfile.close()
the output is :
1group is http://202.177.192.119/radio5 2group is 香港电台第五台
3group is (可于Totem/VLC/MPlayer播放)
1group is http://202.177.192.119/radio35 2group is 香港电台第五台
3group is (DAB版，可于Totem/VLC/MPlayer播放)
1group is http://202.177.192.119/radiopth 2group is 香港电台普通话台
3group is (可于Totem/VLC/MPlayer播放)
1group is http://202.177.192.119/radio31 2group is 香港电台普通话台
3group is (DAB版，可于Totem/VLC/MPlayer播放)
1group is octoshape:rthk.ch1 2group is 香港电台第一台 3group is (粤)
1group is octoshape:rthk.ch2 2group is 香港电台第二台 3group is (粤)
1group is
Traceback (most recent call last):
File "tv.py", line 7, in <module>
print "1group is ",Match.group(1),"2group is ",Match.group(2),"3group is
",Match.group(3)
AttributeError: 'NoneType' object has no attribute 'group'
how to revise my code to get the output?
The problem is that the regex makes '(\(.+\))' mandatory, but example 7
doesn't match it.
You can make it optional by wrapping it in a non-capturing group
(?:...), like this:
pat = r'([a-z].+?\s)(.+)(?:(\(.+\)))?'
Also, it's highly recommended that you use raw string literals
(r'...') when writing regex patterns and replacements.
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