装饰器

def func():
    print("仓鼠")
def flower(f):
    def inner():
        print("111")
        f()
        print("222")
    return inner
flower(func)()
可以理解为   函数名和()是一个组合  当这个组合为func()时函数被启动,当组合缺少一个时候就会不启动函数,
这时函数名可以传递的特性就体现出来了,我传递函数名,再给函数名赋值比如F=func  F() ,这句话的意思就等于了
func()这样我们可以运用这个算法做很多事,比如外部函数调入到内部函数里运行.

 https://q1mi.github.io/PythonBlog/post/advanced_decorator/装饰器进阶

import time
# def func():
#     print('嘻嘻更健康')
# import time
# start_time = time.time()
# time.sleep(0.1)
# func()
# end_time = time.time()
# print('----> 执行效率%s'%(end_time - start_time))
# def timmer(f):
#     start_time = time.time()
#     time.sleep(0.1)
#     f()
#     end_time = time.time()
#     print('----> 执行效率%s'%(end_time - start_time))
# func()
# f1 = func  # func
# func = timmer  # timmer
# func(f1)
# def timmer(f):
#     def inner():
#         start_time = time.time()
#         time.sleep(0.1)
#         f()
#         end_time = time.time()
#         print('----> 执行效率%s' % (end_time - start_time))
#     return inner
# func = timmer(func)  # inner
# func() # inner()

#简单的装饰器
def func():
    print('嘻嘻更健康')
def timmer(f):
    def inner():
        start_time = time.time()
        time.sleep(0.1)
        f()
        end_time = time.time()
        print('----> 执行效率%s' % (end_time - start_time))
    return inner
func = timmer(func)  # inner
func() # inner()

#语法糖 @


# def timmer(f):
#     def inner():
#         start_time = time.time()
#         time.sleep(0.1)
#         f()
#         end_time = time.time()
#         print('----> 执行效率%s' % (end_time - start_time))
#     return inner
# @timmer  # func = timmer(func)
# def func():
#     print('嘻嘻更健康')
# func() # inner()

# 带参数的装饰器
# def timmer(f):
#     def inner(*args,**kwargs):
#         start_time = time.time()
#         time.sleep(0.1)
#         f(*args,**kwargs)
#         end_time = time.time()
#         print('----> 执行效率%s' % (end_time - start_time))
#     return inner

# @timmer  # func = timmer(func)
# def func(a):
#     print('%s嘻嘻更健康'%a)
# @timmer   # func1 = timmer(func1)
# def func1(a,b):
#     print('%s和%s嘻嘻更健康' %(a,b))
# func('萌哥') #
# func1('萌哥','杀毒软件')
# def shouye():
#     pass
# def riji():
#     pass
# def wenzhang():
#     pass

# 带返回值的装饰器
# def timmer(f):
#     def inner(*args,**kwargs):
#         start_time = time.time()
#         time.sleep(0.1)
#         ret = f(*args,**kwargs)  # 222
#         end_time = time.time()
#         print('----> 执行效率%s' % (end_time - start_time))
#         return ret
#     return inner
#
# @timmer  # func = timmer(func)
# def func(a):
#     return 222
# print(func('萌哥'))

#通用装饰器
def wrapper(func):
    def inner(*args,**kwargs):
        '''执行函数前操作'''
        ret = func(*args,**kwargs)
        '''执行函数后的操作'''
        return ret
    return inner

@wrapper
def func():
    print(66)
func()