python 装饰器

def print_run_time(func):
    def wrapper(*args, **kw):
        local_time = time.time()
        func(*args, **kw)
        print('Function [%s] run time is %.2f s' % (func.__name__, time.time() - local_time))

    return wrapper

 

简单的计算方法耗时

import time


def decorator(func):
    def wrapper(*args, **kwargs):
        start_time = time.time()
        func(*args, **kwargs)
        print(args, kwargs)
        end_time = time.time()
        print(end_time - start_time)

    return wrapper


@decorator
def func(name):
    time.sleep(1)


func(name='方法1')  # 函数调用

打印

 

 

def outer(outer_args):
    '''
    带参装饰器
    :param outer_args:
    :return:
    '''

    def middle(func):
        def wrapper(*args, **kwargs):
            print("before func")
            print("use args: " + outer_args)
            wrapper_result = func(*args, **kwargs)
            print("after func")
            return wrapper_result

        return wrapper

    return middle


@outer("hello")
def foo(a, b):
    return a + b


res = foo(1, 1)
print(res)