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Python 零基础100天—Day35 装饰器进阶

  • 2026-06-27 21:42:57
Python 零基础100天—Day35 装饰器进阶

🐍装饰器进阶 — 类装饰器、装饰器链与实战

🕐 预计用时:2-3 小时 | 🎯 目标:掌握类装饰器、装饰器链、实战场景(日志/权限/缓存/重试)


📖 今日目录

  1. 装饰器的执行顺序
  2. 装饰器链 — 多个装饰器叠加
  3. 类装饰器 — 装饰类
  4. 装饰器与类方法
  5. 实战:日志装饰器
  6. 实战:权限校验装饰器
  7. 实战:重试装饰器
  8. 实战:限流装饰器
  9. 实战:类型检查装饰器
  10. 装饰器最佳实践
  11. 今日小结

1. 装饰器的执行顺序

def decorator_a(func):
    print(f"🔴 装饰器 A 被加载")
    def wrapper():
        print("  → A 前置")
        result = func()
        print("  → A 后置")
        return result
    return wrapper

def decorator_b(func):
    print(f"🔵 装饰器 B 被加载")
    def wrapper():
        print("  → B 前置")
        result = func()
        print("  → B 后置")
        return result
    return wrapper

@decorator_a
@decorator_b
def say_hello():
    print("  → 原函数执行")
    return "Hello"

# 加载时的输出(定义时就执行!):
# 🔵 装饰器 B 被加载
# 🔴 装饰器 A 被加载

# 调用时的输出:
say_hello()
#   → A 前置
#   → B 前置
#   → 原函数执行
#   → B 后置
#   → A 后置

💡 执行顺序口诀:
加载:从下往上(先 B 后 A)
调用:从上往下(A → B → 原函数 → B → A)
像洋葱一样,一层一层剥进去,再一层一层包回来


2. 装饰器链 — 多个装饰器叠加

from functools import wraps

def log(func):
    """日志装饰器"""
    @wraps(func)
    def wrapper(*args, **kwargs):
        print(f"📝 [{func.__name__}] 开始执行")
        result = func(*args, **kwargs)
        print(f"📝 [{func.__name__}] 执行完毕")
        return result
    return wrapper

def validate_positive(func):
    """验证参数为正数"""
    @wraps(func)
    def wrapper(*args, **kwargs):
        for arg in args:
            if isinstance(arg, (int, float)) and arg < 0:
                raise ValueError(f"参数不能为负数: {arg}")
        return func(*args, **kwargs)
    return wrapper

def cache_result(func):
    """简单缓存"""
    cache = {}
    @wraps(func)
    def wrapper(*args):
        if args not in cache:
            cache[args] = func(*args)
            print(f"💾 缓存: {args} → {cache[args]}")
        return cache[args]
    return wrapper

# 组合使用
@log
@validate_positive
@cache_result
def power(base, exp):
    return base ** exp

print(power(2, 10))
# 📝 [power] 开始执行
# 💾 缓存: (2, 10) → 1024
# 📝 [power] 执行完毕
# 1024

print(power(2, 10))  # 第二次直接命中缓存
# 📝 [power] 开始执行
# 📝 [power] 执行完毕
# 1024

3. 类装饰器 — 装饰类

装饰器不仅能装饰函数,还能装饰类——修改类的行为。

from functools import wraps

def add_repr(cls):
    """给类自动添加 __repr__ 方法"""
    def __repr__(self):
        attrs = ", ".join(f"{k}={v!r}" for k, v in self.__dict__.items())
        return f"{cls.__name__}({attrs})"

    cls.__repr__ = __repr__
    return cls

@add_repr
class Point:
    def __init__(self, x, y):
        self.x = x
        self.y = y

p = Point(3, 4)
print(p)  # Point(x=3, y=4) ← 自动生成的 repr!
# 类装饰器:自动注册子类
registry = {}

def register(name):
    def decorator(cls):
        registry[name] = cls
        return cls
    return decorator

@register("dog")
class Dog:
    def speak(self):
        return "汪汪!"

@register("cat")
class Cat:
    def speak(self):
        return "喵~"

# 通过名字创建对象
animal = registry["dog"]()
print(animal.speak())  # 汪汪!

print(registry)  # {'dog': <class 'Dog'>, 'cat': <class 'Cat'>}

4. 装饰器与类方法

from functools import wraps

def log_method(func):
    """装饰类方法"""
    @wraps(func)
    def wrapper(self, *args, **kwargs):
        print(f"📝 [{self.__class__.__name__}.{func.__name__}] 调用")
        return func(self, *args, **kwargs)
    return wrapper

class Calculator:
    @log_method
    def add(self, a, b):
        return a + b

    @log_method
    def multiply(self, a, b):
        return a * b

calc = Calculator()
calc.add(3, 5)
# 📝 [Calculator.add] 调用

calc.multiply(4, 6)
# 📝 [Calculator.multiply] 调用
# 装饰 @classmethod 和 @staticmethod
from functools import wraps

def log_func(func):
    @wraps(func)
    def wrapper(*args, **kwargs):
        print(f"📞 调用 {func.__name__}")
        return func(*args, **kwargs)
    return wrapper

class MyClass:
    @classmethod
    @log_func  # 注意顺序:@classmethod 在外面
    def create(cls):
        return cls()

    @staticmethod
    @log_func
    def helper():
        return "helper result"

obj = MyClass.create()
# 📞 调用 create

⚠️ 装饰器顺序很重要!
@classmethod / @staticmethod 放在最外面(最后加载)
自定义装饰器放在里面(先执行)


5. 实战:日志装饰器

import time
import logging
from functools import wraps

logging.basicConfig(level=logging.INFO, format="%(asctime)s [%(levelname)s] %(message)s")
logger = logging.getLogger(__name__)

def log_call(level=logging.INFO, message=""):
    """高级日志装饰器

    Args:
        level: 日志级别
        message: 额外消息
    """
    def decorator(func):
        @wraps(func)
        def wrapper(*args, **kwargs):
            func_name = func.__name__
            extra = f" ({message})" if message else ""

            logger.log(level, f"▶ {func_name}{extra} 开始 | args={args}, kwargs={kwargs}")

            start = time.time()
            try:
                result = func(*args, **kwargs)
                elapsed = time.time() - start
                logger.log(level, f"✅ {func_name} 成功 | 耗时 {elapsed:.4f}s | 返回 {result!r}")
                return result
            except Exception as e:
                elapsed = time.time() - start
                logger.error(f"❌ {func_name} 失败 | 耗时 {elapsed:.4f}s | 错误: {e}")
                raise
        return wrapper
    return decorator

@log_call(level=logging.INFO, message="用户操作")
def process_order(order_id, amount):
    """处理订单"""
    if amount <= 0:
        raise ValueError("金额必须为正数")
    return {"order_id": order_id, "status": "success"}

process_order("ORD001", 99.9)
# 2024-01-15 10:30:15 [INFO] ▶ process_order (用户操作) 开始 | args=('ORD001', 99.9), kwargs={}
# 2024-01-15 10:30:15 [INFO] ✅ process_order 成功 | 耗时 0.0001s | 返回 {'order_id': 'ORD001', 'status': 'success'}

6. 实战:权限校验装饰器

from functools import wraps

# 模拟当前用户(实际项目中从 session/token 获取)
current_user = {"name": "张三", "role": "editor"}

def require_role(*roles):
    """要求用户具有指定角色之一"""
    def decorator(func):
        @wraps(func)
        def wrapper(*args, **kwargs):
            user_role = current_user.get("role")
            if user_role not in roles:
                print(f"🚫 拒绝访问: {current_user['name']} ({user_role})")
                print(f"   需要角色: {', '.join(roles)}")
                raise PermissionError(f"权限不足: 需要 {roles}")
            print(f"✅ 允许访问: {current_user['name']} ({user_role})")
            return func(*args, **kwargs)
        return wrapper
    return decorator

def require_login(func):
    """要求用户已登录"""
    @wraps(func)
    def wrapper(*args, **kwargs):
        if "name" not in current_user:
            print("🚫 请先登录")
            raise PermissionError("未登录")
        return func(*args, **kwargs)
    return wrapper

@require_login
@require_role("admin", "editor")
def publish_article(title, content):
    """发布文章"""
    print(f"📰 文章已发布: {title}")

publish_article("Python 装饰器", "装饰器很强大...")
# ✅ 允许访问: 张三 (editor)
# 📰 文章已发布: Python 装饰器

7. 实战:重试装饰器

import time
from functools import wraps

def retry(max_attempts=3, delay=1, exceptions=(Exception,)):
    """自动重试装饰器

    Args:
        max_attempts: 最大重试次数
        delay: 重试间隔(秒)
        exceptions: 需要重试的异常类型
    """
    def decorator(func):
        @wraps(func)
        def wrapper(*args, **kwargs):
            last_exception = None
            for attempt in range(1, max_attempts + 1):
                try:
                    return func(*args, **kwargs)
                except exceptions as e:
                    last_exception = e
                    print(f"⚠️ {func.__name__} 第 {attempt} 次失败: {e}")
                    if attempt < max_attempts:
                        print(f"   {delay}秒后重试...")
                        time.sleep(delay)
            print(f"❌ {func.__name__} 全部 {max_attempts} 次尝试失败")
            raise last_exception
        return wrapper
    return decorator

# 使用
@retry(max_attempts=3, delay=0.5, exceptions=(ConnectionError, TimeoutError))
def fetch_data(url):
    """模拟不稳定的数据请求"""
    import random
    if random.random() < 0.7:  # 70% 概率失败
        raise ConnectionError(f"连接 {url} 失败")
    return {"data": "success"}

try:
    result = fetch_data("https://api.example.com")
    print(f"结果: {result}")
except ConnectionError:
    print("最终失败")

8. 实战:限流装饰器

import time
from functools import wraps

def rate_limit(calls_per_second=1):
    """限流装饰器:限制函数调用频率"""
    min_interval = 1.0 / calls_per_second
    last_call_time = [0.0]  # 用列表存储(闭包可修改)

    def decorator(func):
        @wraps(func)
        def wrapper(*args, **kwargs):
            elapsed = time.time() - last_call_time[0]
            if elapsed < min_interval:
                wait_time = min_interval - elapsed
                print(f"⏳ 限流: 等待 {wait_time:.2f}秒")
                time.sleep(wait_time)

            last_call_time[0] = time.time()
            return func(*args, **kwargs)
        return wrapper
    return decorator

@rate_limit(calls_per_second=2)  # 每秒最多 2 次
def api_call(endpoint):
    print(f"🌐 请求: {endpoint}")

for i in range(5):
    api_call(f"/api/data/{i}")

# 🌐 请求: /api/data/0
# ⏳ 限流: 等待 0.50秒
# 🌐 请求: /api/data/1
# ⏳ 限流: 等待 0.50秒
# ...

9. 实战:类型检查装饰器

from functools import wraps
import inspect

def type_check(func):
    """根据类型注解检查参数类型"""
    sig = inspect.signature(func)
    annotations = func.__annotations__

    @wraps(func)
    def wrapper(*args, **kwargs):
        # 绑定参数
        bound = sig.bind(*args, **kwargs)
        bound.apply_defaults()

        # 检查每个参数
        for name, value in bound.arguments.items():
            if name in annotations:
                expected_type = annotations[name]
                if not isinstance(value, expected_type):
                    raise TypeError(
                        f"参数 '{name}' 期望类型 {expected_type.__name__}, "
                        f"实际得到 {type(value).__name__}: {value!r}"
                    )

        result = func(*args, **kwargs)

        # 检查返回值
        if 'return' in annotations:
            expected = annotations['return']
            if not isinstance(result, expected):
                raise TypeError(
                    f"返回值期望类型 {expected.__name__}, "
                    f"实际得到 {type(result).__name__}"
                )

        return result
    return wrapper

@type_check
def add(a: int, b: int) -> int:
    return a + b

@type_check
def greet(name: str, times: int = 1) -> str:
    return (f"你好 {name}! " * times).strip()

print(add(3, 5))       # 8
print(greet("张三", 2))  # 你好 张三! 你好 张三!

try:
    add("hello", 5)     # ❌ TypeError
except TypeError as e:
    print(f"错误: {e}")  # 参数 'a' 期望类型 int, 实际得到 str: 'hello'

10. 装饰器最佳实践

✅ 装饰器 DO:

  • ✅ 必须加 @wraps(func) — 保留原函数的 __name__、__doc__、__module__
  • ✅ 用 *args, **kwargs — 让 wrapper 接受任意参数
  • ✅ 返回原函数的返回值 — return func(*args, **kwargs)
  • ✅ 处理异常 — try/except 或者 re-raise
  • ✅ 写文档字符串 — 说明装饰器的作用

❌ 装饰器 DON'T:

  • ❌ 不要修改原函数的参数(除非有充分理由)
  • ❌ 不要吞掉异常(不 re-raise)
  • ❌ 不要让装饰器有副作用(比如修改全局变量)
  • ❌ 不要嵌套太多层装饰器(3-4 个为上限)
  • ❌ 不要在装饰器里做耗时操作(装饰器在导入时执行)

万能模板

from functools import wraps

def my_decorator(func):
    """装饰器说明"""
    @wraps(func)
    def wrapper(*args, **kwargs):
        # 前置逻辑
        try:
            result = func(*args, **kwargs)
            # 后置逻辑
            return result
        except Exception as e:
            # 异常处理
            raise
    return wrapper

11. 今日小结

模式
用途
示例
装饰器链
多个装饰器叠加
@A @B @C
类装饰器
装饰/修改类
@add_repr
日志装饰器
记录函数调用
@log_call
权限装饰器
校验用户权限
@require_role("admin")
重试装饰器
失败自动重试
@retry(times=3)
限流装饰器
控制调用频率
@rate_limit(rps=2)
类型检查
校验参数类型
@type_check

核心要点

  • ✅ 装饰器链加载顺序:从下往上;调用顺序:从上往下
  • ✅ 类装饰器直接修改类(添加方法/属性)或注册类
  • ✅ @classmethod/@staticmethod 放最外面
  • ✅ 每个装饰器都必须 @wraps(func)
  • ✅ 装饰器是 Python 最强大的设计模式之一

🎯 练习建议:
1. 写一个 @deprecated(reason="请使用 new_func") 装饰器,调用时打印警告
2. 写一个 @timeout(seconds=5) 装饰器,超时抛出 TimeoutError
3. 把今天的所有装饰器整合成一个 utils.py 工具模块


📚 Day35 完成!明天学习多线程 — 并发执行的入门

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  1. CONNECT:[ UseTime:0.000466s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000905s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000389s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000305s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000666s ]
  6. SELECT * FROM `set` [ RunTime:0.000280s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000766s ]
  8. SELECT * FROM `article` WHERE `id` = 500027 LIMIT 1 [ RunTime:0.000841s ]
  9. UPDATE `article` SET `lasttime` = 1783027344 WHERE `id` = 500027 [ RunTime:0.020560s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000464s ]
  11. SELECT * FROM `article` WHERE `id` < 500027 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000755s ]
  12. SELECT * FROM `article` WHERE `id` > 500027 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003203s ]
  13. SELECT * FROM `article` WHERE `id` < 500027 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003025s ]
  14. SELECT * FROM `article` WHERE `id` < 500027 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000794s ]
  15. SELECT * FROM `article` WHERE `id` < 500027 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001345s ]
0.112548s