Function setdefault

lib/sqlalchemy/orm/collections.py:1279–1292

(fn)

        return popitem

    def setdefault(fn):
        def setdefault(self, key, default=None):
            if key not in self:
                self.__setitem__(key, default)
                return default
            else:
                value = self.__getitem__(key)
                if value is default:
                    __set_wo_mutation(self, value, None)

                return value

        _tidy(setdefault)
        return setdefault

    def update(fn):
        def update(self, __other=NO_ARG, **kw):