Python -使用内部方法修改字典中的对象

Question

我从Python开始，努力用类对象填充字典。我的目标是用设备定义填充字典，并为所有设备创建接口。问题是，当我试图用Interface对象填充内部列表时，devices字典中的所有对象的列表中都有相同的接口定义，当然，不正确的是什么--接口定义必须是唯一的。在本例中，为2个设备生成结构。其中之一定义了单个接口Gi1/1，但输出结果显示，这两种设备在interfaces列表中的内容相同。源代码如下：

class PE:
    interfaces = []
    def __init__(self, name):
        self.name = name
        print('creating device',self.name)

class Interface:
   def __init__(self, name):
        self.name = name

devices = {}
devices['bbr01'] = (PE('bbr01'))
devices['bbr02'] = (PE('bbr02'))
print('let\'s create an interface in  bbr01\'s list')
devices['bbr01'].interfaces.append(Interface('Gi1/1'))
print('what do we have in  bbr01\'s list?')
print(devices['bbr01'].interfaces[0].name)
print('what do we have in  bbr02\'s list?')
print(devices['bbr02'].interfaces[0].name)

输出：

    creating device bbr01
creating device bbr02
let's create an interface in  bbr01's list
what do we have in  bbr01's list?
Gi1/1
what do we have in  bbr02's list?
Gi1/1

Answer 1

接口成员是类级的，而不是实例。

您需要将其更改为：

class PE(object):
    def __init__(self, name):
        self.name = name
        self.interfaces = []
        print('creating device',self.name)