(self, obj)
return None
Field id for object *obj*, if applicable. Default is ``None``.
Field id for object *obj*, if applicable. Default is ``None``.
Field id for object * obj * if applicable . Default is None .
def id(self, obj):
        '''Field id for object *obj*, if applicable. Default is ``None``.'''
        return None
def id ( self , obj ) : return None