python的抽象類

抽象類：類中可以存在抽象方法，類中的抽象方法是由子類來實現，如果通過類的例項是不能被呼叫的抽象方法，只能由子類的例項物件來呼叫（子類要重寫抽象方法）。

class

print
:def
black_print
(msg)
:raise exception(
'必須子類實現'
)def
rgb_print
(msg)
:pass
print
=print(
)print
.black_print(
'sss'
)#應該丟擲異常

class

print
:def
__init__
(self)
:raise exception(
"此類是介面類"
)def
black_print
(self,msg)
:raise exception(
'必須子類實現'
)def
rgb_print
(self,msg)
:raise exception(
'必須子類實現'
)class
dellprinter
(print)
:def
__init__
(self)
:pass
defblack_print
(self,msg)
:print
("這是戴爾的印表機"
,msg)
defsay
(printer:print,msg)
:    printer.black_print(msg)
if __name__ ==
'__main__'
:    print1=dellprinter(
)    say(print1,
'ss'
)#應該丟擲異常

import abc

class
print
:    @abc.abstractmethod
defblack_print
(self,msg)
:pass
@abc.abstractmethod
defrgb_print
(self,msg)
:pass
@abc.abstractstaticmethod
defadd_rgb()
:pass
@abc.abstractclassmethod
defadd_*****
(cls)
:pass
class
dellprinter
(print)
:def
__init__
(self)
:pass
defblack_print
(self,msg)
:print
("這是戴爾的印表機"
,msg)
@staticmethod
defadd_rgb()
:print
("這是顏色軌道"
)    @classmethod
defadd_*****
(cls)
:print
("這是紙張"
)def
say(printer:print,msg)
:    printer.black_print(msg)
if __name__ ==
'__main__'
:    print1=dellprinter(
)    say(print1,
'ss'
)#應該丟擲異常

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