class UserDict:                                

    def __init__(self, dict=None):             

        self.data = {}                         

        if dict is not None: 

¡¡¡¡¡¡¡¡¡¡self.update(dict) 

def update(self, dict=None, **kwargs):

        if dict is None:

            pass

        elif isinstance(dict, UserDict):

            self.data.update(dict.data)

        elif isinstance(dict, type({})) or not hasattr(dict, 'items'):

            self.data.update(dict)

        else:

            for k, v in dict.items():

                self[k] = v

        if len(kwargs):

            self.data.update(kwargs)