Python抽象类的新写法

class MyCls():
def foo(self):
print('method no implement')
 
运行的例子
 
 
>>> a = MyCls()
>>> a.foo()
method no implement
>>>

class MyCls():
def foo(self):
raise Exception('no implement exception', 'foo method need implement')

>>> a = MyCls()
>>> a.foo()
Traceback (most recent call last):
File "<interactive input>", line 1, in <module>
File "<clipboard>", line 3, in foo
Exception: ('no implement exception', 'foo method need implement')

from abc import ABCMeta
 
from abc import ABCMeta,abstractmethod
 
class Foo():
__metaclass__ = ABCMeta
@abstractmethod
def bar(self):
pass

>>> class B(Foo):
... def bar(self):
... pass
...
>>> B()
<__main__.B object at 0x02EE7B50>
>>> B().bar()
>>> class C(Foo):
... pass
...
>>> C().bar()
Traceback (most recent call last):
File "<interactive input>", line 1, in <module>
TypeError: Can't instantiate abstract class C with abstract methods bar
>>>