.find() function is used for find a substring in a string, and will return location index. E.g. -1 means no such substirng in this string.

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import io
import re
import sys
import codecs

keyword = u'车'
def getKeyWeibo(filename):

    try:
        with codecs.open(filename,'r',encoding='utf8') as cfg:
            cfglist = cfg.readlines()
            for i in range(len(cfglist)):
                if cfglist[i].find(keyword) > 0:
                    f.write(cfglist[i]+'\n')

    except Exception, e:
        print e
        print 'Please check checkboard.cfg,looks like something configured wrong.'