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【跟着AI学Python】第28天:Flask 快速入门(Web 开发)

  • 2026-03-27 14:19:40
【跟着AI学Python】第28天:Flask 快速入门(Web 开发)
Qwen3-Max:

太棒了!欢迎来到 【跟着AI学Python】第28天!🎉今天我们将开启 Web 开发之旅,使用 Python 最流行的轻量级 Web 框架 —— Flask

💡 Flask 简洁、灵活、易上手,是构建 API、小型网站、原型系统的首选!


🎯 第28天目标:

✅ 安装 Flask✅ 编写第一个 “Hello World” Web 应用✅ 添加自定义路由(如 /about✅ 了解 Flask 基本结构


📘 一、安装 Flask

在你的虚拟环境中执行:

$ pip install Flask

✅ 验证安装成功:

$ python -c "import flask; print(flask.__version__)"

📘 二、第一个 Flask 应用:Hello World

🔹 创建文件 app.py

# app.pyfrom flask import Flask# 创建 Flask 应用实例app = Flask(__name__)# 定义根路径路由@app.route("/")def home():    return "<h1>🌍 Hello, Flask World!</h1><p>欢迎来到我的第一个 Web 应用!</p>"# 启动服务器(仅开发环境)if __name__ == "__main__":    app.run(debug=True)

🔹 运行应用及访问效果

✅ debug=True 的作用:

  • 自动重载代码修改
  • 显示详细错误页面(切勿在生产环境开启!

📘 三、添加新路由:/about

只需再加一个函数 + 装饰器!

# 在 app.py 中新增@app.route("/about")def about():    return "<h2>ℹ️ 关于我</h2><p>这是一个用 Flask 构建的简单 Web 应用。</p>"

📘 四、完整代码(含两个路由)

# app.pyfrom flask import Flask# 创建 Flask 应用实例app = Flask(__name__)# 定义根路径路由@app.route("/")def home():    return "<h1>🌍 Hello, Flask World!</h1><p>欢迎来到我的第一个 Web 应用!</p>"# 在 app.py 中新增@app.route("/about")def about():    return "<h2>ℹ️ 关于我</h2><p>这是一个用 Flask 构建的简单 Web 应用。</p>"# 启动服务器(仅开发环境)if __name__ == "__main__":    app.run(debug=True)

💡 小技巧:使用三引号 """ 可以写多行 HTML,无需拼接字符串!


📘 五、Flask 核心概念速览

概念
说明
Flask(__name__)
创建应用对象,__name__ 告诉 Flask 哪里找资源
@app.route("/")装饰器
,将 URL 路径绑定到函数
视图函数
返回字符串(HTML)、JSON 或响应对象
app.run()
启动开发服务器(默认 127.0.0.1:5000

🛠️ 六、常见问题解决

❓ 修改代码后页面没更新?

→ 确保 debug=True 已开启,或手动重启服务器。

❓ 端口被占用?

→ 指定其他端口:

app.run(debug=True, port=8080)  # 改为 8080 端口

❓ 如何允许外部访问?(局域网测试)

app.run(debug=True, host="0.0.0.0")  # 默认只允许本机访问

⚠️ 警告:host="0.0.0.0" 会暴露服务到网络,请仅在可信环境中使用!


💻 七、进阶小练习(可选)

1、添加 /contact 路由,显示邮箱联系方式
@app.route("/contact")def contact():    return "<h2>📮</h2><p>这是一个用 Flask 构建的简单联系方式显示12222234@126.com。</p>"
2、返回 JSON 数据(用于 API):
from flask import jsonify@app.route("/api/user")def api_user():    return jsonify({"name""Alice""age"25})

✅ 今日小任务

  1. 创建 Flask 应用,包含三个页面:

    • 首页 /:显示 “Welcome!”
    • 关于 /about:显示 “This is a Flask demo.”
    • 项目 /projects:显示 “My Projects: Project A, Project B”
  2. 运行后截图或分享 URL 给自己看 😊


📝 小结:Flask 开发

✅ 记住Flask = 路由 + 视图函数,一切从这里开始!


🎉 恭喜完成第28天!你已成功迈出 Web 开发的第一步,今天我们了解Flask的基本操作,后续将专题讲述Flaskweb开发,期待后续课程!

继续加油,你的全栈之路正式启航!🚀🌐

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  1. CONNECT:[ UseTime:0.000480s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000831s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000326s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.006755s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000573s ]
  6. SELECT * FROM `set` [ RunTime:0.000196s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000564s ]
  8. SELECT * FROM `article` WHERE `id` = 478497 LIMIT 1 [ RunTime:0.000424s ]
  9. UPDATE `article` SET `lasttime` = 1774595195 WHERE `id` = 478497 [ RunTime:0.011256s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.002204s ]
  11. SELECT * FROM `article` WHERE `id` < 478497 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000462s ]
  12. SELECT * FROM `article` WHERE `id` > 478497 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000487s ]
  13. SELECT * FROM `article` WHERE `id` < 478497 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003098s ]
  14. SELECT * FROM `article` WHERE `id` < 478497 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000704s ]
  15. SELECT * FROM `article` WHERE `id` < 478497 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000791s ]
0.097588s