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第11章:Python实战项目 - 学以致用

  • 2026-06-29 03:43:27
第11章:Python实战项目 - 学以致用

   

第11章:Python实战项目 - 学以致用

◆ 📌 本章导读

学了这么多知识,是时候大展身手了!通过实战项目巩固所学,提升编程能力!

本章你将学会:

  •  
  • ◆ ✅ 综合运用Python知识
  •  
  • ◆ ✅ 项目架构设计思路
  •  
  • ◆ ✅ 独立完成完整项目
  •  
  • ◆ ✅ 解决实际问题的能力

预计学习时间:7-14天 前置知识:第10章 - 常用库精讲

~ ◆ ~

◆ 11.1 入门级项目

项目1:简易计算器

项目目标:实现支持加减乘除的计算器程序

核心知识:函数、流程控制、异常处理

defcalculator():
"""简易计算器"""
    print("=" * 30)
    print("       简易计算器")
    print("=" * 30)

    while True:
        try:
            # 获取输入
            num1 = float(input("\n请输入第一个数字:"))
            operator = input("请输入运算符(+, -, *, /):")
            num2 = float(input("请输入第二个数字:"))

            # 计算
            if operator == '+':
                result = num1 + num2
            elif operator == '-':
                result = num1 - num2
            elif operator == '*':
                result = num1 * num2
            elif operator == '/':
                if num2 == 0:
                    print("错误:除数不能为0!")
                    continue
                result = num1 / num2
            else:
                print("错误:无效的运算符!")
                continue

            print(f"结果: {num1}{operator}{num2} = {result}")

            # 询问是否继续
            cont = input("\n是否继续?(y/n):")
            if cont.lower() != 'y':
                break

        except ValueError:
            print("错误:请输入有效的数字!")

    print("\n感谢使用计算器!")

if __name__ == "__main__":
    calculator()

~ ◆ ~

项目2:待办事项管理

项目目标:实现可以增删改查的待办事项系统

核心知识:列表、字典、文件操作

importjson
importos

TODO_FILE = "todos.json"

defload_todos():
"""加载待办事项"""
    if os.path.exists(TODO_FILE):
        with open(TODO_FILE, 'r', encoding='utf-8') as f:
            return json.load(f)
    return []

defsave_todos(todos):
"""保存待办事项"""
    with open(TODO_FILE, 'w', encoding='utf-8') as f:
        json.dump(todos, f, ensure_ascii=False, indent=2)

defadd_todo(todos):
"""添加待办事项"""
    title = input("请输入待办事项:")
    todos.append({"title": title, "done": False})
    save_todos(todos)
    print("添加成功!")

defview_todos(todos):
"""查看待办事项"""
    if not todos:
        print("暂无待办事项")
        return

    print("\n" + "=" * 30)
    for i, todo in enumerate(todos, 1):
        status = "✓" if todo["done"] else "○"
        print(f"{i}. [{status}] {todo['title']}")
    print("=" * 30)

deftoggle_todo(todos):
"""标记完成/未完成"""
    view_todos(todos)
    try:
        index = int(input("请输入要标记的序号:")) - 1
        if 0 <= index < len(todos):
            todos[index]["done"] = not todos[index]["done"]
            save_todos(todos)
            print("更新成功!")
        else:
            print("无效的序号!")
    except ValueError:
        print("请输入有效的数字!")

defmain():
"""主函数"""
    todos = load_todos()

    while True:
        print("\n===== 待办事项管理 =====")
        print("1. 查看所有待办")
        print("2. 添加待办")
        print("3. 标记完成/未完成")
        print("4. 删除待办")
        print("5. 退出")

        choice = input("请选择操作:")

        if choice == '1':
            view_todos(todos)
        elif choice == '2':
            add_todo(todos)
        elif choice == '3':
            toggle_todo(todos)
        elif choice == '4':
            view_todos(todos)
            try:
                index = int(input("请输入要删除的序号:")) - 1
                if 0 <= index < len(todos):
                    todos.pop(index)
                    save_todos(todos)
                    print("删除成功!")
            except ValueError:
                print("请输入有效的数字!")
        elif choice == '5':
            print("再见!")
            break
        else:
            print("无效选择!")

if __name__ == "__main__":
    main()

~ ◆ ~

◆ 11.2 进阶级项目

项目4:爬虫入门

项目目标:爬取网页数据并保存

核心知识:requests、BeautifulSoup、文件操作

importrequests
frombs4import BeautifulSoup
importcsv
importtime

defscrape_books():
"""爬取书籍信息"""
    base_url = "http://books.toscrape.com/catalogue/page-{}.html"
    all_books = []

    for page in range(1, 3):  # 爬取前2页
        print(f"正在爬取第{page}页...")

        response = requests.get(base_url.format(page))
        soup = BeautifulSoup(response.text, 'html.parser')

        books = soup.find_all('article', class_='product_pod')

        for book in books:
            title = book.h3.a['alt']
            price = book.find('p', class_='price_color').text
            rating = book.p['class'][1]

            all_books.append({
                'title': title,
                'price': price,
                'rating': rating
            })

        time.sleep(1)  # 礼貌爬取

    # 保存到CSV
    with open('books.csv', 'w', encoding='utf-8', newline='') as f:
        writer = csv.DictWriter(f, fieldnames=['title', 'price', 'rating'])
        writer.writeheader()
        writer.writerows(all_books)

    print(f"爬取完成!共{len(all_books)}本书籍")

if __name__ == "__main__":
    scrape_books()

~ ◆ ~

项目5:数据分析报告生成

项目目标:读取数据,进行分析,生成报告

核心知识:pandas、matplotlib、文件操作

importpandasaspd
importmatplotlib.pyplotasplt

defanalyze_sales():
"""销售数据分析"""
    # 模拟数据
    data = {
        '月份': ['1月', '2月', '3月', '4月', '5月', '6月'],
        '销售额': [12000, 15000, 18000, 16000, 22000, 25000],
        '成本': [8000, 9000, 11000, 10000, 13000, 15000]
    }
    df = pd.DataFrame(data)

    # 计算利润
    df['利润'] = df['销售额'] - df['成本']
    df['利润率'] = (df['利润'] / df['销售额'] * 100).round(2)

    # 打印报告
    print("=" * 50)
    print("              销售分析报告")
    print("=" * 50)
    print(f"\n总销售额: {df['销售额'].sum()}元")
    print(f"总成本: {df['成本'].sum()}元")
    print(f"总利润: {df['利润'].sum()}元")
    print(f"平均利润率: {df['利润率'].mean()}%")
    print(f"\n最佳月份: {df.loc[df['利润'].idxmax(),'月份']}")
    print(f"最佳利润: {df['利润'].max()}元")

    # 生成图表
    plt.rcParams['font.sans-serif'] = ['SimHei']
    plt.figure(figsize=(10, 5))

    plt.subplot(1, 2, 1)
    plt.bar(df['月份'], df['销售额'], label='销售额')
    plt.bar(df['月份'], df['成本'], label='成本')
    plt.legend()
    plt.title('月度销售与成本对比')

    plt.subplot(1, 2, 2)
    plt.plot(df['月份'], df['利润率'], marker='o', color='red')
    plt.title('月度利润率趋势')

    plt.tight_layout()
    plt.savefig('sales_report.png')
    print("\n报告图表已保存为sales_report.png")

if __name__ == "__main__":
    analyze_sales()

~ ◆ ~

◆ 11.3 高级项目

项目7:简易Web应用

项目目标:使用Flask开发用户管理系统

核心知识:Flask、SQLite、HTML模板

fromflaskimport Flask, render_template, request, redirect, url_for
importsqlite3

app = Flask(__name__)

defget_db():
    conn = sqlite3.connect('users.db')
    conn.row_factory = sqlite3.Row
    return conn

definit_db():
    conn = get_db()
    conn.execute('''CREATE TABLE IF NOT EXISTS users
                    (id INTEGER PRIMARY KEY AUTOINCREMENT,
                     name TEXT NOT NULL,
                     email TEXT NOT NULL)''')
    conn.commit()
    conn.close()

@app.route('/')
defindex():
    conn = get_db()
    users = conn.execute('SELECT * FROM users').fetchall()
    conn.close()
    return render_template('index.html', users=users)

@app.route('/add', methods=['POST'])
defadd_user():
    name = request.form['name']
    email = request.form['email']
    conn = get_db()
    conn.execute('INSERT INTO users (name, email) VALUES (?, ?)', (name, email))
    conn.commit()
    conn.close()
    return redirect(url_for('index'))

@app.route('/delete/<int:user_id>')
defdelete_user(user_id):
    conn = get_db()
    conn.execute('DELETE FROM users WHERE id = ?', (user_id,))
    conn.commit()
    conn.close()
    return redirect(url_for('index'))

if __name__ == '__main__':
    init_db()
    app.run(debug=True)

~ ◆ ~

◆ 📝 本章小结

项目经验总结

入门项目:巩固基础语法和数据结构进阶项目:学习第三方库和API使用高级项目:掌握Web开发和数据库操作项目架构:从需求分析到功能实现的完整流程  

🎯 下一步学习方向

  •  
  • ◆ 深入学习框架(Django、FastAPI)
  •  
  • ◆ 学习前端技术(HTML/CSS/JavaScript)
  •  
  • ◆ 探索人工智能(Machine Learning)
  •  
  • ◆ 参与开源项目
  •  
  • ◆ 构建个人作品集

~ ◆ ~

◆ 💬 互动环节

你完成了哪个项目?遇到了什么困难?

欢迎在留言区分享你的学习成果!

~ ◆ ~

学习建议:实践是最好的老师!尝试修改项目代码,添加新功能,不断优化!

 

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  1. CONNECT:[ UseTime:0.000557s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000759s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000349s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000295s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000492s ]
  6. SELECT * FROM `set` [ RunTime:0.000212s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000585s ]
  8. SELECT * FROM `article` WHERE `id` = 501712 LIMIT 1 [ RunTime:0.000454s ]
  9. UPDATE `article` SET `lasttime` = 1783021857 WHERE `id` = 501712 [ RunTime:0.008212s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000319s ]
  11. SELECT * FROM `article` WHERE `id` < 501712 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000496s ]
  12. SELECT * FROM `article` WHERE `id` > 501712 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000434s ]
  13. SELECT * FROM `article` WHERE `id` < 501712 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000882s ]
  14. SELECT * FROM `article` WHERE `id` < 501712 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.008693s ]
  15. SELECT * FROM `article` WHERE `id` < 501712 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.022984s ]
0.115025s