您好,登錄后才能下訂單哦!
本文實例講述了Python裝飾器用法。分享給大家供大家參考,具體如下:
無參數(shù)的裝飾器
#coding=utf-8 def log(func): def wrapper(): print 'before calling ',func.__name__ func() print 'end calling ',func.__name__ return wrapper @log def hello(): print 'hello' @log def hello2(name): print 'hello',name if __name__=='__main__': hello()
運行結(jié)果:
before calling hello
hello
end calling hello
帶參數(shù)的裝飾器:
#coding=utf-8 def log(func): def wrapper(name): print 'before calling ',func.__name__ func(name) print 'end calling ',func.__name__ return wrapper @log def hello(name): print 'hello',name @log def hello2(name): print 'hello',name if __name__=='__main__': hello('haha')
運行結(jié)果:
before calling hello
hello haha
end calling hello
多個參數(shù)的時候:
#coding=utf-8 def log(func): ''' *無名字的參數(shù) **有名字的參數(shù) :param func: :return: ''' def wrapper(*args,**kvargs): print 'before calling ',func.__name__ print 'args',args,'kvargs',kvargs func(*args,**kvargs) print 'end calling ',func.__name__ return wrapper @log def hello(name,age): print 'hello',name,age @log def hello2(name): print 'hello',name if __name__=='__main__': hello('haha',2) hello(name='hehe',age=3)
輸出:
end calling hello
before calling hello
args () kvargs {'age': 3, 'name': 'hehe'}
hello hehe 3
end calling hello
裝飾器里帶參數(shù)的情況
本質(zhì)就是嵌套函數(shù)
#coding=utf-8 def log(level,*args,**kvargs): def inner(func): def wrapper(*args,**kvargs): print level,'before calling ',func.__name__ print level,'args',args,'kvargs',kvargs func(*args,**kvargs) print level,'end calling ',func.__name__ return wrapper return inner @log(level='INFO') def hello(name,age): print 'hello',name,age @log def hello2(name): print 'hello',name if __name__=='__main__': hello('haha',2)
運行輸出:
INFO before calling hello
INFO args ('haha', 2) kvargs {}
hello haha 2
INFO end calling hello
更多關(guān)于Python相關(guān)內(nèi)容可查看本站專題:《Python數(shù)據(jù)結(jié)構(gòu)與算法教程》、《Python Socket編程技巧總結(jié)》、《Python函數(shù)使用技巧總結(jié)》、《Python字符串操作技巧匯總》及《Python入門與進階經(jīng)典教程》
希望本文所述對大家Python程序設(shè)計有所幫助。
免責聲明:本站發(fā)布的內(nèi)容(圖片、視頻和文字)以原創(chuàng)、轉(zhuǎn)載和分享為主,文章觀點不代表本網(wǎng)站立場,如果涉及侵權(quán)請聯(lián)系站長郵箱:is@yisu.com進行舉報,并提供相關(guān)證據(jù),一經(jīng)查實,將立刻刪除涉嫌侵權(quán)內(nèi)容。