[英]how to define an abstract class in python and force implement variables
So, I am trying to define an abstract base class with couple of variables which I want to to make it mandatory to have for any class which "inherits" this base class.. So, something like: 所以,我试图定义一个带有几个变量的抽象基类,我想让它对任何“继承”这个基类的类都必须要有。所以,类似于:
class AbstractBaseClass(object):
foo = NotImplemented
bar = NotImplemented
Now, 现在,
class ConcreteClass(AbstractBaseClass):
# here I want the developer to force create the class variables foo and bar:
def __init__(self...):
self.foo = 'foo'
self.bar = 'bar'
This should throw error: 这应该抛出错误:
class ConcreteClass(AbstractBaseClass):
# here I want the developer to force create the class variables foo and bar:
def __init__(self...):
self.foo = 'foo'
#error because bar is missing??
I maybe using the wrong terminology.. but basically, I want every developer who is "implementing" the above class to force to define these variables?? 我可能使用了错误的术语..但基本上,我希望每个“实现”上述类的开发人员强制定义这些变量?
Update : abc.abstractproperty
has been deprecated in Python 3.3. 更新 :
abc.abstractproperty
已在Python 3.3中弃用。 Use property
with abc.abstractmethod
instead as shown here . 使用
property
与abc.abstractmethod
如图所示,而不是在这里 。
import abc
class AbstractBaseClass(object):
__metaclass__ = abc.ABCMeta
@abc.abstractproperty
def foo(self):
pass
@abc.abstractproperty
def bar(self):
pass
class ConcreteClass(AbstractBaseClass):
def __init__(self, foo, bar):
self._foo = foo
self._bar = bar
@property
def foo(self):
return self._foo
@foo.setter
def foo(self, value):
self._foo = value
@property
def bar(self):
return self._bar
@bar.setter
def bar(self, value):
self._bar = value
class AbstractBaseClass(object):
def __init__(self):
assert hasattr(self, 'foo')
assert hasattr(self, 'bar')
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