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5分钟学会一个面试小知识:Python装饰器

  • 2026-02-07 04:17:07
5分钟学会一个面试小知识:Python装饰器

1. 装饰器的本质

在 Python 中,函数是对象,可以作为参数传递给另一个函数,也可以作为另一个函数的返回值。

装饰器的本质就是一个高阶函数: 它接收一个函数作为参数,并返回一个新的函数。

2. 从零构建一个装饰器

假设我们有一个核心业务函数 process_data ,现在需要增加 “记录函数执行时间” 的功能,但我们不能直接修改process_data 的内部代码。

因此我们可以定义一个timer函数,它接收目标函数func,在内部定义一个wrapper函数来执行计时逻辑,最后返回这个wrapper

import time

def timer(func):
# 定义内部包装函数
def wrapper():
        start_time = time.time()
        func()  # 执行原函数
        end_time = time.time()
print(f"执行耗时: {end_time - start_time:.4f} 秒")

return wrapper  # 返回新的函数对象

# 业务函数(无参数)
def process_data():
    time.sleep(1)
print("基础数据处理完成")

# 手动调用装饰器
process_data = timer(process_data)
process_data()

3. 使用语法糖  @

Python 提供了 @ 符号作为语法糖,自动处理上述的赋值过程。将 @timer 放在函数定义之前,等同于执行了 process_data = timer(process_data) 。

@timer
def process_data():    
    time.sleep(1)    
print("数据处理完成")

process_data()

4. 解决参数传递问题

上面的例子有一个缺陷:它只能装饰不需要参数的函数。

随着业务迭代,我们的 process_data 变得更复杂,需要接收参数(例如数据内容和处理延迟)。如果直接使用上面的 timer ,代码会因为 wrapper 不接受参数而报错。

为了让装饰器具有通用性,我们需要在 wrapper 中使用 *args 和 **kwargs 来接收任意参数,并透传给原函数。

def timer(func):
def wrapper(*args, **kwargs):
        start_time = time.time()
# 将接收到的所有参数原封不动地传给原函数
        result = func(*args, **kwargs) 
        end_time = time.time()
print(f"[{func.__name__}] 执行耗时: {end_time - start_time:.4f} 秒")
return result # 确保原函数的返回值被透传
return wrapper

# 升级后的业务函数:包含参数和返回值
@timer
def process_data(content, delay=0.5):
    time.sleep(delay)
return f"成功处理数据: {content}"

# 调用验证
print(process_data("User_Logs", delay=1.2))

5. 完善元数据 ( functools.wraps )

当你打印被装饰后的  process_data.__name__ 时,你会发现它变成了 wrapper ,而不是  process_data 。这在调试、生成文档或使用某些依赖元数据的框架时会造成困扰。

Python 标准库提供了 functools.wraps 装饰器,专门用于将原函数的元数据(如函数名、文档字符串)复制到 wrapper 函数上。

最终代码:

import time
from functools import wraps

def timer(func):
    @wraps(func)  # 核心步骤:保留原函数元数据
def wrapper(*args, **kwargs):
        start_time = time.time()
        result = func(*args, **kwargs)
        end_time = time.time()
print(f"[{func.__name__}] 执行耗时: {end_time - start_time:.4f} 秒")
return result
return wrapper

@timer
def process_data(content, delay=0.5):
"""模拟核心业务逻辑处理"""
    time.sleep(delay)
return f"成功处理数据: {content}"

# 验证元数据
print(f"函数名: {process_data.__name__}")  # 输出: process_data
print(f"文档: {process_data.__doc__}")     # 输出: 模拟核心业务逻辑处理

总结

关于装饰器,只需掌握以下三个关键点:

  1. 定义:装饰器是一种在不改变原函数代码和调用方式的前提下,为其增加新功能的语法糖。

  2. 作用:在不修改源码的情况下,实现日志、权限校验、缓存等切面功能。

  3. 规范:必须使用 *args**kwargs 处理参数,并使用 @wraps 保留原函数元数据。

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  1. CONNECT:[ UseTime:0.000620s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000799s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.006078s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000403s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000659s ]
  6. SELECT * FROM `set` [ RunTime:0.005740s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000771s ]
  8. SELECT * FROM `article` WHERE `id` = 465952 LIMIT 1 [ RunTime:0.012212s ]
  9. UPDATE `article` SET `lasttime` = 1770502588 WHERE `id` = 465952 [ RunTime:0.004806s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.002376s ]
  11. SELECT * FROM `article` WHERE `id` < 465952 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000718s ]
  12. SELECT * FROM `article` WHERE `id` > 465952 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000493s ]
  13. SELECT * FROM `article` WHERE `id` < 465952 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003104s ]
  14. SELECT * FROM `article` WHERE `id` < 465952 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.039245s ]
  15. SELECT * FROM `article` WHERE `id` < 465952 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.079643s ]
0.243587s