python从txt中提取每一行的中文

第一单元
application software应用软件
basic application基本应用软件
communication device通信设备
compact disc (CD)光盘
computer competency计算机能力

请问怎么提取

 if __name__ == '__main__':

    info = open("know.txt")
    print "中文"
    #a = info.readlines()
    #print a
    for line in info:
        line = line.decode('GB2312').encode('utf-8')
        print line
        letter_str = re.findall(r'([a-zA-Z]+)',line,re.MULTILINE)
        hanzi_str = re.findall(r'([^a-zA-Z]+)',line,re.MULTILINE)
        print hanzi_str
        str = [letter_str,hanzi_str]
        knowledge.append(str)

    write_excel(knowledge)

txt编码是gb2312，怎么处理呢？

http://www.cnblogs.com/finallyliuyu/archive/2012/02/06/2340685.html