如何将特定正则表达式应用于特定行

Question

我正试图在特定的行上应用特定的regex，这是由启动键指定的:现在，我在python变量my_config中包含了文件的内容。

file content
---------------------------------------------
[paths]
path_jamjs: C:/Users/[changeUsername]/AppData/Roaming/npm/node_modules/jamjs/bin/jam.js
path_php: C:/[changeUsername]/php/php.exe

values to replace
---------------------------------------------
"path_jamjs": { "changeUsername": "Te" },
"path_php": { "changeUsername": "TeS" },

with open ("my.ini", "r") as myfile:
  my_config = myfile.read()

如何在my_config中的整个文件内容上应用regex替换，该文件内容将替换特定对应行的值，而不必逐行循环，是否可以使用regex?执行此操作？

给定的

path: path_php
key: changeUsername
value: Te

变化

path_jamjs: C:/Users/[changeUsername]/AppData/Roaming/npm/node_modules/jamjs/bin/jam.js
path_php: C:/[changeUsername]/php/php.exe

至

path_jamjs: C:/Users/[changeUsername]/AppData/Roaming/npm/node_modules/jamjs/bin/jam.js
path_php: C:/Te/php/php.exe

Answer 1

with open ("my.ini", "r") as myfile:
    my_config = myfile.read()

lines = my_config.splitlines(True)
replacements = {"path_jamjs": {"changeUsername": "Te"},
                "path_php": {"changeUsername": "TeS"}}

for path, reps in replacements.items():
    for i, line in enumerate(lines):
        if line.startswith(path + ':'):
            for key, value in reps.items():
                line = line.replace('[' + key + ']', value)
            lines[i] = line

result = ''.join(lines)