桥梁设计模式中属性设置的python方法

我正在尝试使用“桥接”设计模式构建一个模块，以将抽象与其实现解耦。我还需要一个属性

try\u limit

，它可以在运行时动态更改

经过一些尝试和错误之后，我编写了

bridge.py

，这正如我所期望的那样工作，但是我需要分别在

抽象

和

实现者

类中编写属性和setter两次。还有其他类似蟒蛇的方法吗

bridge.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import abc

class Abstraction(object):
    def __init__(self, imp):
        self._imp = imp

    @property
    def try_limit(self):
        return self._imp.try_limit

    @try_limit.setter
    def try_limit(self, value):
        self._imp.try_limit = value

    def run(self, cmd):
        ret = self._imp.run(cmd)

        return ret


class Implementor(metaclass=abc.ABCMeta):
    def __init__(self):
        self._try_limit = 0

    @property
    def try_limit(self):
        return self._try_limit

    @try_limit.setter
    def try_limit(self, value):
        self._try_limit = value

    @abc.abstractmethod
    def run(self, cmd):
        pass        


class ImpA(Implementor):
    def __init__(self, realtime_display=False):
        super().__init__()

    def run(self, arg):
    # Implement A which use try_limit
    # try_limit can be changed dynamically when running 


class ImpB(Implementor):
    def __init__(self):
        super().__init__()

    def run(self, arg):
    # Implement B which also use try_limit
    # try_limit can be changed dynamically when running

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import abc

class Abstraction(object):
    def __init__(self, imp):
        self._imp = imp

    @property
    def try_limit(self):
        return self._imp.try_limit

    @try_limit.setter
    def try_limit(self, value):
        self._imp.try_limit = value

    def run(self, cmd):
        ret = self._imp.run(cmd)

        return ret


class Implementor(metaclass=abc.ABCMeta):
    def __init__(self):
        self.try_limit = 0

    @abc.abstractmethod
    def run(self, cmd):
        pass        


class ImpA(Implementor):
    def __init__(self, realtime_display=False):
        super().__init__()

    def run(self, arg):
    # Implement A which use try_limit
    # try_limit can be changed dynamically when running 


class ImpB(Implementor):
    def __init__(self):
        super().__init__()

    def run(self, arg):
    # Implement B which also use try_limit
    # try_limit can be changed dynamically when running

---

环境：Python 3.6.3

阅读Joe提供的wiki链接后，我发现我可以在

Implementor

类中删除属性

try\u limit

，因为我已经直接将

try\u limit

设置为实例'\u imp'。感谢Joe&Jonrsharpe对我问题的回答

bridge\u修订版.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import abc

class Abstraction(object):
    def __init__(self, imp):
        self._imp = imp

    @property
    def try_limit(self):
        return self._imp.try_limit

    @try_limit.setter
    def try_limit(self, value):
        self._imp.try_limit = value

    def run(self, cmd):
        ret = self._imp.run(cmd)

        return ret


class Implementor(metaclass=abc.ABCMeta):
    def __init__(self):
        self._try_limit = 0

    @property
    def try_limit(self):
        return self._try_limit

    @try_limit.setter
    def try_limit(self, value):
        self._try_limit = value

    @abc.abstractmethod
    def run(self, cmd):
        pass        


class ImpA(Implementor):
    def __init__(self, realtime_display=False):
        super().__init__()

    def run(self, arg):
    # Implement A which use try_limit
    # try_limit can be changed dynamically when running 


class ImpB(Implementor):
    def __init__(self):
        super().__init__()

    def run(self, arg):
    # Implement B which also use try_limit
    # try_limit can be changed dynamically when running

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import abc

class Abstraction(object):
    def __init__(self, imp):
        self._imp = imp

    @property
    def try_limit(self):
        return self._imp.try_limit

    @try_limit.setter
    def try_limit(self, value):
        self._imp.try_limit = value

    def run(self, cmd):
        ret = self._imp.run(cmd)

        return ret


class Implementor(metaclass=abc.ABCMeta):
    def __init__(self):
        self.try_limit = 0

    @abc.abstractmethod
    def run(self, cmd):
        pass        


class ImpA(Implementor):
    def __init__(self, realtime_display=False):
        super().__init__()

    def run(self, arg):
    # Implement A which use try_limit
    # try_limit can be changed dynamically when running 


class ImpB(Implementor):
    def __init__(self):
        super().__init__()

    def run(self, arg):
    # Implement B which also use try_limit
    # try_limit can be changed dynamically when running

环境：Python 3.6.3

您看到了吗？不，我在这里使用示例：