python之如何使for循环写入特定行

我有一个包含一组数据的文本文件。写入新文件时，我使用的是 for 循环，但我的 for 循环会为每一行写入每一行。例如:我的数据是

Hello 
World 
This 
Is 
The 
Text 

我的预期输出是它使用 xml 标记来标记使用字符串的数据。输出应该类似于

<first>Hello</first> 
<second>World</second> 
<third>This</third> 
"" 
"" 
<sixth>Text</sixth> 

等等。但是在循环中我使用我的输出看起来像

<first>Hello</first> 
<second>Hello</second> 
<third>Hello</third> 
<fourth>Hello</fourth> 
<fifth>Hello</fifth> 
<sixth>Hello</sixth> 
<first>World</first> 
<second>World</second> 
<third>World</third> 
<fourth>World</fourth> 
<fifth>World</fifth> 
<sixth>World</sixth> 
"" 
"" 

以此类推，直到结束。我该如何解决。我的代码是

def tagData(filename): 
    original = open(filename, 'r') 
    new = open('test2.txt', 'w') 
    index = 0 
    for line in original: 
        if index%6 == 0: 
            new.write('<first>'+str(line).strip('\n')+'</first>\n') 
            index = index + 1 
        if index%6 == 1: 
            new.write('<second>'+str(line).strip('\n')+'</second>\n') 
            index = index + 1 
        if index%6 == 2: 
            new.write('<third>'+str(line).strip('\n')+'</third>\n') 
            index = index + 1 
        if index%6 == 3: 
            new.write('<fourth>'+str(line).strip('\n')+'</fourth>\n') 
            index = index + 1 
        if index%6 == 4: 
            new.write('<fifth>'+str(line).strip('\n')+'</fifth>\n') 
            index = index + 1 
        if index%6 == 5: 
            new.write('<sixth>'+str(line).strip('\n')+'</sixth>\n') 
            index = index + 1 
    original.close() 
    new.close() 

请您参考如下方法:

我会这样写:

from itertools import cycle, izip 
 
tags = ['first', 'second', 'third', 'fourth', 'fifth', 'sixth'] 
with open('input') as fin, open('output', 'w') as fout: 
    for tag, line in izip(cycle(tags), fin): 
        fout.write('<{0}>{1}</{0}>\n'.format(tag, line.strip())) 

这避免了混淆索引和 if 逻辑...