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Python 装饰器的灵活实现:带参数与不带参数

  • 2026-02-07 12:23:29
Python 装饰器的灵活实现:带参数与不带参数

背景

装饰器是Python中一种强大的语法糖,它允许我们在不修改原函数代码的情况下,为函数添加额外的功能。装饰器本质上是一个可调用对象,它接受一个函数作为输入,并返回一个新的函数。装饰器的使用方式非常灵活,既可以不带参数使用,也可以带参数使用

小编环境

import sysprint('python 版本:',sys.version.split('|')[0])#python 版本: 3.11.11

函数装饰器实现

我们先来看一个简单的函数装饰器实现:

import timedefdelayed_start(func=None, *, duration=1):defdecorator(_func):defwrapper(*args, **kwargs):            print(f"Wait for {duration} seconds before starting...")            time.sleep(duration)return _func(*args, **kwargs)return wrapperif func isNone:return decoratorelse:return decorator(func)

这个装饰器可以以两种方式使用:

  1. 不带参数使用
    当装饰器不带参数使用时,Python会直接将装饰的函数作为参数传递给 delayed_start
@delayed_startdefhello_no_arg(name="datashare"):    print("from hello_no_arg, param name =", name)

等价于:

hello_no_arg = delayed_start(hello_no_arg)
  1. 带参数使用
    当装饰器带参数使用时,Python会先调用装饰器函数,返回一个真正的装饰器,然后再用这个装饰器装饰函数
@delayed_start(duration=2)defhello_with_arg(name="datashare"):    print("from hello_with_arg, param name =", name)

等价于:

hello_with_arg = delayed_start(duration=2)(hello_with_arg)

实现原理

delayed_start函数的巧妙之处在于它通过检查 func参数是否为 None来判断装饰器的使用方式:

  • 如果 func不是 None,说明是不带参数使用,直接返回 decorator(func)
  • 如果 func是 None,说明是带参数使用,返回 decorator函数等待接收真正的函数参数

类装饰器实现

类装饰器通过实现 __call__方法来实现装饰器的功能。下面是带参数和不带参数的类装饰器实现:

from functools import wrapsimport timeclassTimer:def__init__(self, func=None, *, print_args=False):        self.func = func        self.print_args = print_argsdef__call__(self, *args, **kwargs):# 情况 1:@Timer(print_args=True)# 第一次 __call__,args[0] 是函数if self.func isNone:            func = args[0]return self._decorate(func)# 情况 2:@Timer# 或者已经绑定好函数,真正执行return self._decorate(self.func)(*args, **kwargs)def_decorate(self, func):        @wraps(func)defwrapper(*args, **kwargs):            st = time.perf_counter()            ret = func(*args, **kwargs)if self.print_args:                print(f'"{func.__name__}", args: {args}, kwargs: {kwargs}')            print(f"time cost: {time.perf_counter() - st:.4f} seconds")return retreturn wrapper
  1. 不带参数使用
@Timerdefcompute(x):    time.sleep(1)return x * 2

当类装饰器不带参数使用时,Python会创建 Timer类的实例,并将 compute函数传递给 __init__方法。此时 self.func就是 compute函数。当我们调用 compute(10)时,实际上是调用 Timer实例的 __call__方法

  1. 带参数使用
@Timer(print_args=True)defcompute2(x):    time.sleep(1)return x * 3

当类装饰器带参数使用时,Python会先调用 Timer(print_args=True)创建实例,此时 self.func为 None。然后用这个实例去装饰 compute2函数,这相当于调用 Timer实例的 __call__方法,并将 compute2作为参数传入

两种实现方式的比较

特性
函数装饰器
类装饰器
代码简洁性
更简洁,适合简单的装饰逻辑
更复杂,但结构更清晰
状态管理
需要使用闭包或nonlocal变量
可以使用实例属性,更直观
可扩展性
适合简单的装饰功能
适合需要维护状态的复杂装饰器
可读性
对于简单场景更易读
对于复杂场景更易维护

实际应用场景

  1. 性能监控
    如 Timer装饰器,用于测量函数执行时间
  2. 权限验证
    检查用户是否有权限执行某个函数
  3. 日志记录
    自动记录函数的调用和参数
  4. 缓存
    实现函数结果的缓存,提高性能
  5. 重试机制
    当函数执行失败时自动重试

最佳实践

  1. 使用 functools.wraps装饰器来保留原函数的元数据(如函数名、文档字符串等)
  2. 对于简单的装饰器,优先使用函数装饰器
  3. 对于需要维护状态的装饰器,考虑使用类装饰器
  4. 在设计带参数的装饰器时,确保同时支持带参数和不带参数的使用方式

总结

Python装饰器是一个强大而灵活的特性,它允许我们以非侵入式的方式增强函数的功能。通过掌握函数装饰器和类装饰器的实现方式,以及如何实现带参数和不带参数的装饰器,我们可以编写出更加通用和可重用的代码。无论是简单的函数增强还是复杂的状态管理,装饰器都能提供优雅的解决方案

理解装饰器的工作原理不仅有助于我们编写更好的装饰器,还能加深我们对Python函数式编程和元编程的理解,是成为高级Python开发者的重要一步

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  1. CONNECT:[ UseTime:0.000883s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001621s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.101213s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.074415s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001626s ]
  6. SELECT * FROM `set` [ RunTime:0.009887s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001623s ]
  8. SELECT * FROM `article` WHERE `id` = 473186 LIMIT 1 [ RunTime:0.007110s ]
  9. UPDATE `article` SET `lasttime` = 1770477944 WHERE `id` = 473186 [ RunTime:0.023537s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.017569s ]
  11. SELECT * FROM `article` WHERE `id` < 473186 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002219s ]
  12. SELECT * FROM `article` WHERE `id` > 473186 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002698s ]
  13. SELECT * FROM `article` WHERE `id` < 473186 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.019649s ]
  14. SELECT * FROM `article` WHERE `id` < 473186 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002718s ]
  15. SELECT * FROM `article` WHERE `id` < 473186 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001742s ]
0.360055s