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我的 Python 学习日记26

  • 2026-06-28 20:55:50
我的 Python 学习日记26

📝 Python 修炼日记:掌握项目的“遥控器” (JSON 配置文件)🗓️ 日期:2026-04-17🎯 今日目标:彻底告别“硬编码”,学会让代码读取外部的 JSON 配置文件,做到“改配置不改代码”。

📖 核心概念

在之前写“拖延追踪器”时,我们把任务存到了 .json 文件里。但在真实的 GitHub 项目中,JSON 最常见的用途其实是作为配置文件(Config)

初学者写代码,喜欢把各种设置死死地写在代码里(这叫硬编码 Hardcoding),比如:download_path = "D:\\downloads"如果别人下载了你的代码,他想存到 E 盘,他就必须在一堆极其复杂的 .py 文件里找到这一行去修改。万一他不小心删了一个逗号,整个程序就崩溃了。

高级开发者绝对不会这么干。他们会把所有需要修改的设置,单独抽离出来,放进一个类似 config.json 的文件里。这个 JSON 文件,就是程序的“遥控器”。 用户只需要改这个文本文件,完全不需要懂 Python 代码,程序就会乖乖听话!

最棒的是,JSON 的格式和我们之前学的 Python 字典 (Dict) 几乎一模一样! 只要你会字典,你就天生会 JSON。

📊 知识汇总表

硬编码 vs 配置文件

对比维度
写在 Python 代码里 (硬编码)
写在 JSON 文件里 (配置文件)
修改难度
极高(要在上万行代码里找)
极低(单独的文件,一目了然)
安全性
容易误删代码导致崩溃
绝对安全(不懂代码的普通用户也能改)
GitHub 常见做法
被严格禁止
标配(通常叫 config.json 或 settings.json

⚙️ 逻辑与流程

当我们运行一个带配置文件的 GitHub 项目时,它的标准启动流程如下:

用户修改 config.json
运行 main.py
步骤 1: 导入 json 模块
步骤 2: 打开并读取 config.json
步骤 3: 将 JSON 数据转换为 Python 字典
步骤 4: 把字典里的设置应用到程序中
程序按照用户的新设置开始工作!

💻 实战演练

假设我们现在拿到了一个 GitHub 上的“自动发送早安邮件”的脚本。它由两个文件组成:

文件 1:遥控器 config.json(用户只需修改这里)

{    "sender_name": "超级机器人",    "target_email": "boss@company.com",    "send_time": "08:00",    "enable_weather_report":true}

文件 2:主程序 main.py(核心代码,最好别碰)

import json# 1. 读取遥控器 (配置文件)with open("config.json", "r", encoding="utf-8") as f:    config = json.load(f)  # 这瞬间,config 就变成了一个 Python 字典!# 2. 从字典里取出设置name = config["sender_name"]target = config["target_email"]time = config["send_time"]weather_on = config["enable_weather_report"]# 3. 按照设置执行程序print(f"--- 邮件发送系统启动 ---")print(f"正在准备发给: {target}")print(f"设定的发送时间是: {time}")if weather_on:    print(f"【附加功能】已开启天气预报播报。")print(f"落款人将被设置为: {name}")print(f"--- 系统准备就绪 ---")

如果你运行 main.py,它会完美读取 JSON 里的内容并打印出来。

💡 今日感悟

今天最大的收获是:明白了为什么 GitHub 上总有一堆 .json 或 .yaml 文件。

它们不是神秘代码,它们只是作者留给你的“控制面板”!以后拿到开源项目,第一步去配环境(requirements.txt),第二步就该去翻翻它的 config.json,看看有什么好玩的参数可以调。

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  1. CONNECT:[ UseTime:0.000503s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000702s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.005958s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000287s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000566s ]
  6. SELECT * FROM `set` [ RunTime:0.008984s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000739s ]
  8. SELECT * FROM `article` WHERE `id` = 487346 LIMIT 1 [ RunTime:0.000915s ]
  9. UPDATE `article` SET `lasttime` = 1783077357 WHERE `id` = 487346 [ RunTime:0.019269s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000274s ]
  11. SELECT * FROM `article` WHERE `id` < 487346 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000465s ]
  12. SELECT * FROM `article` WHERE `id` > 487346 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.017296s ]
  13. SELECT * FROM `article` WHERE `id` < 487346 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004468s ]
  14. SELECT * FROM `article` WHERE `id` < 487346 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004394s ]
  15. SELECT * FROM `article` WHERE `id` < 487346 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.035171s ]
0.187162s