問題描述
我有兩個文件，我想對它們執行一些逐行操作.(換句話說，每個文件的第一行是對應的，第二行也是如此，等等.)現在，我可以想到一些稍微麻煩的方法來同時遍歷兩個文件.然而，這是 Python，所以我想有一些語法簡寫.
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.
換句話說，有沒有一些簡單的方法來適應
In other words, is there some simple way to adapt the
for line in file:
以便同時從兩個文件中提取數據?
so that it pulls data from both files simultaneously?
推薦答案
Python 2:
使用 itertools.izip 加入兩個迭代器.
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)):
如果文件長度不等，請使用 izip_longest.
If the files are of unequal length, use izip_longest.
在 Python 3 中，請改用 zip 和 zip_longest.此外，使用 with 打開文件，這樣即使出現錯誤，也會自動處理關閉.
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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