如何同时遍历两个文件中的行?

问题描述

我有两个文件，我想对它们执行一些逐行操作.(换句话说，每个文件的第一行是对应的，第二行也是如此，等等.)现在，我可以想到一些稍微麻烦的方法来同时遍历两个文件.然而，这是 Python，所以我想有一些语法简写.

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，有没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:

以便同时从两个文件中提取数据?

so that it pulls data from both files simultaneously?

推荐答案

Python 2:

使用 itertools.izip 加入两个迭代器.

Use itertools.izip to join the two iterators.

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

如果文件长度不等，请使用 izip_longest.

If the files are of unequal length, use izip_longest.

在 Python 3 中，请改用 zip 和 zip_longest.此外，使用 with 打开文件，这样即使出现错误，也会自动处理关闭.

In Python 3, use zip and zip_longest instead. Also, use a with to open files, so that closing is handled automatically even in case of errors.

with open(file1name) as file1, open(file2name) as file2:
    for line1, line2 in zip(file1, file2):
        #do stuff

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