Python如何把类当做字典来访问

class A:

    def __init__(self):

        self.a = 1

        self.b = 2

a = A()

print(a.__dict__)

# {'a': 1, 'b': 2}

#获取变量a：

print(a.__dict__['a'])

# 1

class A:

    def __init__(self):

        self.a = 1

        self.b = 2

    def keys(self):

        return ('a','b',)

    def __getitem__(self, item):

        return getattr(self, item)

a = A()

print(dict(a))

#输出：{'a': 1, 'b': 2}