Python:用内部方法修改字典中的对象

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我从Python开始，并努力用类对象填充字典。我的目标是用设备定义填充dictionary并为所有设备创建接口。问题是当我试图用接口类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，这肯定是不对的——接口定义必须是惟一的。在这个例子中，结构是为2个设备生成的。其中一个定义了一个接口Gi1/1，但是输出显示两个设备在interfaces列表中具有相同的内容。源代码如下:

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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:

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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