使用 Python 在 .txt 文件的每一行中附加一个特定的字符串 [英] Append in each line of a .txt file a specific string using Python

问题描述

我有一个 .txt 文件，格式如下:

I have a .txt file with has the following format:

/Users/my_user/folder1/myfile.dat
/Users/my_user/folder2/myfile.dat
/Users/my_user/folder3/myfile.dat
.
.
.
so on

我想在每一行的末尾附加另一个文件夹路径，使其看起来像这样:

I want to append in the end of each line another folder path in order to make it look like this:

/Users/my_user/folder1/myfile.dat,/Users/my_user/folder1/otherfile.dat
/Users/my_user/folder2/myfile.dat,/Users/my_user/folder1/otherfile.dat
/Users/my_user/folder3/myfile.dat,/Users/my_user/folder1/otherfile.dat
.
.
.
so on

直到现在我都在循环尝试:

Till now I have tried in a loop:

with open("test.txt", "a") as myfile:
    myfile.write("append text")

但我只写在文件的末尾.

But i only writes at the end of the file.

推荐答案

你可以使用 re.sub 函数.

You could use re.sub function.

在每一行的开头追加.

with open("test.txt", "r") as myfile:
    fil = myfile.read().rstrip('\n')
with open("test.txt", "w") as f:
    f.write(re.sub(r'(?m)^', r'append text', fil))

附加到每行的末尾.

with open("test.txt", "r") as myfile:
    fil = myfile.read().rstrip('\n')
with open("test.txt", "w") as f:
    f.write(re.sub(r'(?m)$', r'append text', fil))

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