class DictObj(dict):
    def __init__(self, **kwargs):
        dict.__init__(self, **kwargs)
        self.__dict__ = self

obj = DictObj(a=1)
print(obj.a)            # 1
print(obj.get('a'))     # 1
print(obj)              # {'a': 1}

obj.a = 2
print(obj.a)            # 2
print(obj.get('a'))     # 2
print(obj)              # {'a': 2}

obj.b = 3
print(obj.b)            # 3
print(obj.get('b'))     # 3
print(obj)              # {'a': 2, 'b': 3}

obj.update({'c': 4})
print(obj.c)            # 4
print(obj.get('c'))     # 4
print(obj)              # {'a': 2, 'b': 3, 'c': 4}

new_obj = DictObj(**{'foo': 'bar'})
print(new_obj.foo)          # bar
print(new_obj.get('foo'))   # bar
print(new_obj)              # {'foo': 'bar'}