Remove an attribute value to our object instance.

        :param str item: Application attribute name
        :raises: AttributeError

def remove(self, item):
        """Remove an attribute value to our object instance.

        :param str item: Application attribute name
        :raises: AttributeError

        """
        if item not in self.__dict__[self.ATTRIBUTES].keys():
            raise AttributeError('%s does not exist' % item)
        delattr(self, item)