python 動態繼承 class

Question

是否可以在 python 中進行動態 inheritance？ 我正在嘗試SuperSwitch在運行時並基於參數device_type和connection_type

任何幫助，將不勝感激

例如：

mapper = {
    'juniper': {
        'telnet': JuniperTelnet,
        'ssh': JuniperSSH
    },
    'cisco': {
        'telnet': CiscoIosTelnet,
        'ssh': CiscoIosSSH
    }
}

class SuperSwitch:
    def __init__(self, device_type, connection_type, ip, port, user, pw):
        # how can I dynamically inherit the class based on the device_type and connection_type
        # for example mapper['juniper']['telnet']
        device_args = dict(
            device_type='{d}_{conn}'.format(p=device_type, conn=connection_type),
            ip=ip,
            port=port,
            username=user,
            password=pw,
        )
        super().__init__(**device_args)

    def my_send_command(self, cmd):
        print("running:", cmd)
        super().send_command(cmd)


class MyJuniper(SuperSwitch):
    def __init__(self, device_type, connection_type, ip, port, user, pw):
        super().__init__(device_type, connection_type, ip, port, user, pw)
    def my_send_command(self, cmd):
        super().my_send_command(cmd)
        # my other code


sw = MyJuniper('juniper', 'telnet', '10.0.0.2', 1234, 'user', 'pw')
sw.my_send_command('show ?')

Answer 1

我不認為你能做到這一點，或者至少我不知道你怎么能做到這一點。 但是您可以將您的實現隱藏在超級開關中，這就是類的用途。

mapper = {
    'juniper': {
        'telnet': JuniperTelnet,
        'ssh': JuniperSSH
    },
    'cisco': {
        'telnet': CiscoIosTelnet,
        'ssh': CiscoIosSSH
    }
}

class DummyImplementation():
    
    def __init__(self, **kwargs):
        self.args = kwargs
    
    def send(self, cmd):
        print(cmd)

def get_right_implementation(device_type, connection_type):
    # do you magic!
    return DummyImplementation

class SuperSwitch:
    def __init__(self, device_type, connection_type, ip, port, user, pw):
        # how can I dynamically inherit the class based on the device_type and connection_type
        # for example mapper['juniper']['telnet']
        implementation_class = get_right_implementation(device_type, connection_type)
        device_args = dict(
            device_type='{d}_{conn}'.format(p=device_type, conn=connection_type),
            ip=ip,
            port=port,
            username=user,
            password=pw,
        )
        self.implementation = implementation_class(**device_args)


    def my_send_command(self, cmd):
        self.implementation.send(cmd)