def printable():
def wrapper(cls):
cls.print=lambda self:print(self.content)
return cls
return wrapper
@printable() # 先调用生成wrapper Word=wrapper(Word)
class Word:
def __init__(self,content):
self.content=content
print(Word.__dict__)
b=Word('bnm\nuiop')
b.print()
def printable(cls):
cls.print=lambda self:print(self.content)
return cls
@printable # 不加(),隐含调用,传递Word(被装饰 对象) Word=printable(Word)
class Word:
def __init__(self,content):
self.content=content
print(Word.__dict__)
b=Word('bnm\nuiop')
b.print()
def b(self):
print('content : {}'.format(self.content))
def bb(cls):
def wrapper(*args,**kwargs):
cls.p=b
ret=cls(*args,**kwargs)
return ret
return wrapper
@bb # 经过包装后bbb变成了wrapper函数,此函数执行后返回cls对象
class bbb:
def __init__(self,content):
self.content=content
pass
print(type(bbb),bbb)
v=bbb(999)
print(type(v),v)
v.p()
def printable(cls):
def _print(self):
print('content: {}'.format(self.content),'decorator')
cls.print=_print
return cls
class Document:
def __init__(self,content):
self.content=content
class Word(Document):pass
class Pdf(Document):pass
@printable
class PrintableWord(Word):pass
print(PrintableWord.__dict__)
print(PrintableWord.mro())
pw=PrintableWord('uiop')
pw.print()
@printable
class PrintablePdf(Pdf):pass
print(PrintablePdf.__dict__)
print(PrintablePdf.__mro__)
