向文件中插入行的 Pythonic 方式 [英] Pythonic way of inserting lines to a file

问题描述

正如描述所描述的，我想按顺序将文本添加到文件中.比如说，我有一个像这样的文件(不是 HTML，这只是一种想象的语言)让我们称之为 ALLTHEITEMS:

So as the description describes, I would like to add text to a file in a sequential manner. Say, for example I have a file like this (NOT HTML, this is just an imaginary language) lets call it ALLTHEITEMS:

<items>
</items>

说另一个名为ITEMS的文件:

say another file named ITEMS:

banana
apple
blueberry
pickle

而且我已经阅读了项目并创建了一个数组:['banana','apple','blueberry','pickle']

And I already have read through items and have an array created:['banana','apple','blueberry','pickle']

我想遍历数组中的每个项目并将其写入标签之间的 ALLTHEITEMS.

I want to go through each item in the array and write it to ALLTHEITEMS in between the tags.

所以最后 ALLTHEITEMS 应该是这样的:

So in the end ALLTHEITEMS should look like:

<items>
banana
apple
blueberry
pickle
</items>

最pythonic的方式是什么?

What is the most pythonic way?

推荐答案

我会这样做:

with open(outputfile,'w') as out, open(inputfile) as f:
    for line in f:
        out.write(line)
        if tag_match(line):  #Somehow determine if this line is a match where we want to insert text.
           out.write('
'.join(fruits)+'
')

你可能想出一个方法来让它更快，但我怀疑它是否值得.这很简单，易于阅读，并且可以完成工作.pythonic"对我来说足够了:-)

You might come up with a way to make it faster, but I doubt it is worthwhile. This is simple, easy to read, and gets the job done. "pythonic" enough for me :-)

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