目录

 

功能目标

编写一个可以打印被装饰函数名称、执行时间、内存地址得装饰器

前置依赖包

import time 

import functools 

from decorator import decorator

基于普通的函数嵌套

> def log1(fn):     def _wrapper(*args, **kwargs): start = time.clock() result = fn(*args, **kwargs) print("%s is invoked with time consumed: %s seconds at address %s" % (fn.__name__, str(time.time() - start), id(fn))) return result return _wrapper

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基于@decorator

@decoratordef log(f, *args, **kwargs): start = time.time() result = f(*args, **kwargs) print("%s is invoked with time consumed: %s at address %s" % (f.__name__, str(time.time() - start), id(f))) return result

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使用@functools

def log2(f):    @functools.wraps(f) def wrapper(*args, **kwargs): start = time.clock() result = f(*args, **kwargs) print("%s is invoked with time consumed: %s seconds at address %s" % (f.__name__, str(time.time() - start), id(f))) return result return wrapper

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测试

@log2def f11(x, y): return x**y result = f11(2,3) print("result:" + str(result))

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切换到不同的实现中，他们的效果是相同的。

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