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【跟着AI学Python】第24天:JSON 数据处理

  • 2026-02-26 00:52:58
【跟着AI学Python】第24天:JSON 数据处理
Qwen3-Max

太棒了!欢迎来到 【跟着AI学Python】第24天!🎉今天我们将深入学习 JSON(JavaScript Object Notation) —— 当前最主流的轻量级数据交换格式,广泛用于 Web API、配置文件、数据库存储等场景!

💡 Python 内置 json 模块,让你轻松在 字符串 ↔ Python 对象 之间转换,并读写 JSON 文件!


🎯 第24天目标:

✅ 掌握 json.loads() 和 json.dumps()✅ 学会读写 JSON 文件:json.load() / json.dump()✅ 理解 JSON 与 Python 数据类型的对应关系✅ 实战:保存和加载用户配置


📘 一、JSON 是什么?

  • 纯文本格式,人类可读
  • 支持:对象(字典)、数组(列表)、字符串、数字、布尔值、null
  • 示例:
{  "name": "Alice",  "age": 25,  "is_student": false,  "courses": ["Math", "Physics"],  "address": null}

📘 二、核心函数速查表

操作
函数
说明
字符串 → Python 对象json.loads(str)
"load from string"
Python 对象 → 字符串json.dumps(obj)
"dump to string"
文件 → Python 对象json.load(file)
从文件读取 JSON
Python 对象 → 文件json.dump(obj, file)
写入 JSON 到文件

🔑 记忆技巧:

  • 带 s 的处理 字符串loadsdumps
  • 不带 s 的处理 文件对象loaddump

📘 三、json.loads():解析 JSON 字符串

import json# JSON 字符串(注意:必须用双引号!)json_str = '''{    "name": "张三",    "age": 20,    "scores": {"math": 90, "english": 85}}'''# 转为 Python 字典data = json.loads(json_str)print(data["name"])        # 张三print(data["scores"]["math"])  # 90print(type(data))          # <class 'dict'>

⚠️ 常见错误:

  • 使用单引号 '{"name": "Alice"}' → 合法(Python 字符串)
  • 但 JSON 内部必须双引号,否则 json.loads() 报错!

📘 四、json.dumps():生成 JSON 字符串

🔹 关键参数:

  • ensure_ascii=False :允许中文直接显示(默认会转为\u4e2d)
  • indent=2 :美化输出,缩进 2 空格(适合调试)
  • sort_keys=True :按键排序(可选)

📘 五、读写 JSON 文件

🔹 写入 JSON 文件

🔹 读取 JSON 文件

✅ 最佳实践

  • 始终指定 encoding="utf-8" 避免中文乱码
  • 用 with open 确保文件正确关闭

💻 综合实战:用户配置管理器

import jsonimport osCONFIG_FILE = "user_config.json"def save_config(username, preferences):    """保存用户配置到 JSON 文件"""    config = {        "username": username,        "preferences": preferences,        "version""1.0"    }    with open(CONFIG_FILE, "w", encoding="utf-8"as f:        json.dump(config, f, ensure_ascii=False, indent=2)    print(f"✅ 配置已保存到 {CONFIG_FILE}")def load_config():    """从 JSON 文件加载配置"""    if not os.path.exists(CONFIG_FILE):        print("📭 配置文件不存在")        return None    try:        with open(CONFIG_FILE, "r", encoding="utf-8"as f:            return json.load(f)    except (json.JSONDecodeError, IOError) as e:        print(f"❌ 读取配置失败: {e}")        return None# 使用示例if __name__ == "__main__":    # 保存配置    prefs = {"theme""light""notifications"True}    save_config("李四", prefs)    # 加载配置    config = load_config()    if config:        print(f"欢迎回来, {config['username']}!")        print("偏好设置:", config["preferences"])
运行后生成 user_config.json

🔄 JSON 与 Python 类型对照表

JSON
Python
object
dict
array
list
string
str
number (int/real)
int/float
true
True
false
False
null
None

⚠️ 注意:

  • JSON 没有元组、集合、自定义类
  • 复杂对象需先转为字典/列表再序列化

✅ 今日小任务

  1. 用 json.dumps()将 {"message": "你好,世界!"}转为 JSON 字符串(确保中文不乱码)
  2. 创建 data.json 文件,写入一个包含姓名和年龄的字典,然后读取并打印年龄

💡 答案参考:

# 任务1import jsons = json.dumps({"message": "你好,世界!"}, ensure_ascii=False)print(s)# 任务2data = {"name": "王五", "age": 30}with open("data.json", "w") as f:    json.dump(data, f)with open("data.json") as f:    loaded = json.load(f)    print(loaded["age"])

📝 小结:JSON 处理最佳实践

场景
建议
API 响应解析response.json()
(requests 库已封装)
生成 JSON 字符串json.dumps(obj, ensure_ascii=False, indent=2)
保存配置/数据
用 json.dump() + utf-8 编码
错误处理
捕获 json.JSONDecodeError

✅ 记住JSON 是“数据”,不是“代码” —— 它安全、通用、跨语言!


🎉 恭喜完成第24天!你已掌握 结构化数据存储与交换的核心技能,能轻松对接 Web API 和配置系统!

继续加油,你的数据处理能力越来越全面了!📊🐍

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  1. CONNECT:[ UseTime:0.000599s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000761s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000312s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000270s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000634s ]
  6. SELECT * FROM `set` [ RunTime:0.000191s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000619s ]
  8. SELECT * FROM `article` WHERE `id` = 477055 LIMIT 1 [ RunTime:0.003257s ]
  9. UPDATE `article` SET `lasttime` = 1772253794 WHERE `id` = 477055 [ RunTime:0.003400s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000694s ]
  11. SELECT * FROM `article` WHERE `id` < 477055 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000486s ]
  12. SELECT * FROM `article` WHERE `id` > 477055 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.008365s ]
  13. SELECT * FROM `article` WHERE `id` < 477055 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.020254s ]
  14. SELECT * FROM `article` WHERE `id` < 477055 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.009305s ]
  15. SELECT * FROM `article` WHERE `id` < 477055 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.014175s ]
0.128918s