python使用点操作符访问字典(dict)数据的方法

class DottableDict(dict):  def __init__(self, *args, **kwargs):    dict.__init__(self, *args, **kwargs)    self.__dict__ = self  def allowDotting(self, state=True):    if state:      self.__dict__ = self    else:      self.__dict__ = dict()d = DottableDict()d.allowDotting()d.foo = 'bar'print(d['foo'])# barprint(d.foo)# bard.allowDotting(state=False)print(d['foo'])# bar from //www.VeVB.COmprint(d.foo)# AttributeError: 'DottableDict' object has no attribute 'foo'