从规则文本文件中提取列字段

    test.txt内容如下：
1|name1|agg1|add1|phone1|card1|
2|name2|agg2|add2|phone2|card2|

    如何提取第4列的内容，即add1、add2

def iterdatainfile(filename, spliter='\t'):
    with open(filename, 'rt') as handle:
        for ln in handle:
            yield ln.split(spliter)
 
focue, LF = 3, '\n'  #LF = 3：取第4列
with open("output.txt", 'wt') as handle:
    handle.writelines([row[focue] + LF
                       for row in iterdatainfile('test.txt',spliter='|')])

# 下面是显示提取到的内容
txtstr = open('output.txt')
a = txtstr.read()
print(a)