Python Class 属性和子类化

Question

我在谷歌上搜索并玩了一段时间，但没有结果尝试做这样的事情：

class  A(object):
    cl_att = 'I am an A class attribute'

class  B(A):
    cl_att += ' modified for B type'

class  C(A):
    cl_att += ' modified for C type'


instA = A()
print insAt.cl_att
>>> I am an A class attribute

instB = B()
print instB.cl_att
>>> I am an A class attribute modified for B type

instC = C()
print instC.cl_att
>>> I am an A class attribute modified for C type

print instA.cl_att
>>> I am an A class attribute

简而言之，我希望能够 "use and then override" 我的 parent class.

的 class 属性

Answer 1

引用父 class 属性并连接到它：

class  A(object):
    cl_att = 'I am an A class attribute'

class  B(A):
    cl_att = A.cl_att + ' modified for B type'

class  C(A):
    cl_att = A.cl_att + ' modified for C type'

Class 主体的执行很像函数，本地名称构成 class 属性。 cl_att 在新的 'function' 中不存在，无法为 B 和 C 创建主体，因此您需要直接引用基础 class 上的属性相反。

演示：

>>> class  A(object):
...     cl_att = 'I am an A class attribute'
... 
>>> class  B(A):
...     cl_att = A.cl_att + ' modified for B type'
... 
>>> class  C(A):
...     cl_att = A.cl_att + ' modified for C type'
... 
>>> A.cl_att
'I am an A class attribute'
>>> B.cl_att
'I am an A class attribute modified for B type'
>>> C.cl_att
'I am an A class attribute modified for C type'

Answer 2

假设您只有一个 parent class，您可以使用 child class 答案末尾定义的 inherit_and_append 装饰器es，得到想要的结果，像这样：

class  A(object):
    cl_att = 'I am an A class attribute'

@inherit_and_append('cl_att')
class  B(A):
    cl_att = ' modified for B type'

@inherit_and_append('cl_att')
class  C(A):
    cl_att = ' modified for C type'

如果有更高级的要求或条件，您可以进一步扩展装饰器。

class inherit_and_append(object):
    def __init__(self, *attrs):
        super(inherit_and_append, self).__init__()

        self._attrs = attrs

    def __call__(self, klass):
        parent = klass.__bases__[0]  # Assuming you have a single parent class
        for attr in self._attrs:
            if not hasattr(parent, attr):
                raise AttributeError("'{}' class has no '{}' attribute".format(parent.__name__, attr))

            parent_value = getattr(parent, attr)
            klass_value = getattr(klass, attr)
            setattr(klass, attr, parent_value + klass_value)

        return klass

Python Class 属性和子类化

Python Class Attributes and Subclassing

python

class

subclassing