# !/usr/bin/python
#-*- coding:utf-8 -*-

'''示例1: 最簡(jiǎn)單的函數(shù),表示調(diào)用了兩次'''
def myfun():
    print('hello')

myfun()
myfun()

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# 使用裝飾函數(shù)在函數(shù)執(zhí)行前和執(zhí)行后分別附加額外功能
'''示例2: 替換函數(shù)(裝飾)
裝飾函數(shù)的參數(shù)是被裝飾的函數(shù)對(duì)象约郁，返回原函數(shù)對(duì)象
裝飾的實(shí)質(zhì)語(yǔ)句: myfunc = deco(myfunc)'''
def deco(func):
    print('before')
    func()
    print('after')
    return func

def myfunc():
    print('myfunc called')

myfune = deco(myfunc)
myfune()
myfune()

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# 使用語(yǔ)法糖@來(lái)裝飾函數(shù)
'''示例3: 使用語(yǔ)法糖@來(lái)裝飾函數(shù)秕豫，相當(dāng)于“myfunc = deco(myfunc)”
但發(fā)現(xiàn)新函數(shù)只在第一次被調(diào)用危纫，且原函數(shù)多調(diào)用了一次'''
def deco(func):
    print('before')
    func()
    print('later')
    return func

@deco
def myfun():
    print('myfun,,,,')

myfun()
myfun()

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# 使用內(nèi)嵌包裝函數(shù)來(lái)確保每次新函數(shù)都被調(diào)用
'''示例4: 使用內(nèi)嵌包裝函數(shù)來(lái)確保每次新函數(shù)都被調(diào)用渔欢，
內(nèi)嵌包裝函數(shù)的形參和返回值與原函數(shù)相同状蜗，裝飾函數(shù)返回內(nèi)嵌包裝函數(shù)對(duì)象'''
def deco(abc):
    def _deco():
        print('before...')
        abc()
        print('later...')
    
    return _deco

@deco
def cc():
    print('cc....')

cc()
cc()

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# 對(duì)帶參數(shù)的函數(shù)進(jìn)行裝飾
'''示例5: 對(duì)帶參數(shù)的函數(shù)進(jìn)行裝飾丧裁，
內(nèi)嵌包裝函數(shù)的形參和返回值與原函數(shù)相同掉蔬，裝飾函數(shù)返回內(nèi)嵌包裝函數(shù)對(duì)象'''
def deco(func):
    def _deco(a,b):
        print('before')
        func(a,b)
        print('after')
    return _deco

@deco
def myfun(a,b):
    print('my,,,,')
    return a+b

myfun(1,2)
myfun(3,4)

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# 對(duì)參數(shù)數(shù)量不確定的函數(shù)進(jìn)行裝飾
'''示例6: 對(duì)參數(shù)數(shù)量不確定的函數(shù)進(jìn)行裝飾勾习，
參數(shù)用(*args, **kwargs)浓瞪，自動(dòng)適應(yīng)變參和命名參數(shù)'''
def deco(func):
    def _deco(*args,**kwargs):
        print('before')
        func(*args,**kwargs)
        print('after')
    return _deco

@deco
def myfun1(a,b):
    print('myfun')
    return a+b

@deco
def myfun2(a,b,c):
    print('fun2...')
    return a+b+c

myfun1(1,2)
myfun2(1,2,3)

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# 讓裝飾器帶參數(shù)
# '''示例7: 在示例4的基礎(chǔ)上，讓裝飾器帶參數(shù)巧婶，
# 和上一示例相比在外層多了一層包裝乾颁。
# 裝飾函數(shù)名實(shí)際上應(yīng)更有意義些'''
def deco(arg):
    def _deco(func):
        def __deco():
            print('before')
            func()
            print('after')
        return __deco
    return _deco

@deco('moudle1')
def myfun():
    print('myfun,,,')

@deco('moudle2')
def myfun2():
    print('myfun222')

myfun()
myfun2()

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# 讓裝飾器帶 類 參數(shù)
'''示例8: 裝飾器帶類參數(shù)'''
class locker:
    def __init__():
        print('locker __init__.........')
    
    @staticmethod
    def acquire():
        print('locker.acquire..... ')
    
    @staticmethod
    def release():
        print('locker.release...........')
    
def deco(cls):
    def _deco(func):
        def __deco():
            print('bofore.....')
            cls.acquire()
            try:
                return func
            finally:
                cls.release()
        return __deco
    return _deco

@deco(locker)
def myfunc():
    print('myfunc.....')

myfunc()
myfunc()


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# 裝飾器帶類參數(shù)涂乌，并分拆公共類到其他py文件中，同時(shí)演示了對(duì)一個(gè)函數(shù)應(yīng)用多個(gè)裝飾器
'''mylocker.py: 公共類 for 示例9.py'''
class mylocker:
    def __init__(self):
        print('__init__called')
    
    @staticmethod
    def acquire():
        print('mylocker.acquire.......')
    
    @staticmethod
    def unlock():
        print('mylocker.unlock..........')
    
class lockerex(mylocker):
    @staticmethod
    def acquire():
        print('lockerex.acquire')
    
    @staticmethod
    def unlock():
        print('lockerex.unlock.....')

def lockhelper(cls):
    '''cls 必須實(shí)現(xiàn)acquire和release靜態(tài)方法'''
    def _deco(func):
        def __deco(*args,**kwargs):
            print('before..........')
            cls.acquire()
            try:
                return func(*args,**kwargs)
            finally:
                cls.unlock()
        return __deco
    return _deco


# 調(diào)用
class example:
    @lockhelper(mylocker)
    def myfunc(self):
        print('example.myfunc...........')
    
    @lockhelper(mylocker)
    @lockhelper(lockerex)
    def myfun2(self,a,b):
        print('example.myfun2.......')
        return a+b
    
if __name__ == "__main__":
    a = example()
    a.myfunc()
    print(a.myfunc())
    print(a.myfun2(1,2))
    print(a.myfun2(3,4))

*僅學(xué)習(xí)英岭，侵刪