如何将特定的正则表达式应用于特定的行

Question

我试图在由开始键指定的特定行上应用特定的正则表达式：现在我将文件内容包含在python变量my_config中

---

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()

如何在将要替换特定对应行上的值的my_config中的整个文件内容上应用正则表达式替换，而不必一行一行地循环，我可以使用正则表达式来做到这一点吗？

特定

path: path_php
key: changeUsername
value: Te

更改

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)