如何同时迭代两个文件中的行？ [英] How to iterate across lines in two files simultaneously?

问题描述

我有两个文件，我想在两个文件中执行一些按行操作。 （换句话说，每个文件的第一行对应，第二行等等）现在，我可以想到一些稍微麻烦的方法来同时迭代这两个文件; 然而，这是Python，所以我想有一些句法简写。

I have two files, and I want to perform some line-wise operation across both of them. (In other words, the first lines of each file correspond, as do the second, etc.) Now, I can think of a number of slightly cumbersome ways to iterate across both files simultaneously; however, this is Python, so I imagine that there is some syntactic shorthand.

换句话说，是否有一些简单的方法来适应

In other words, is there some simple way to adapt the

for line in file:

这样它可以同时从两个文件中提取数据吗？

so that it pulls data from both files simultaneously?

推荐答案

使用 itertools.izip 加入两个迭代器。

from itertools import izip
for line_from_file_1, line_from_file_2 in izip(open(file_1), open(file_2)):

如果文件是不等长，使用 izip_longest 。

If the files are of unequal length, use izip_longest.

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