python

Question

我有一个包含以下内容的文本文件：

name 1,
name 2,
name 3,
...

在python中，我如何搜索一行并写入它？

例如，我想写入以"name 2"

开头的行

name 1,
name 2,name 1,
name 3,
...

如有任何帮助，我们将不胜感激！

Answer 1

示例代码：

string_to_check = "name 2"
string_to_add = "name 1,"
with open("test.txt", 'r+') as file_to_write:
    lines = file_to_write.readlines()
    file_to_write.seek(0)
    file_to_write.truncate()
    for line in lines:
        if line.startswith(string_to_check):
           line = line.rstrip("\n") + string_to_add + "\n"
        file_to_write.write(line)

Reference no 1 Reference no 2

python - 写入文本文件中的特定行

python - writing to a specific line in text file

file

line