163     def keys(self, txn=None):  argument
164         if txn is not None:
165             return self.db.keys(txn)
198     def items(self, txn=None):  argument
199         if txn is not None:
200             items = self.db.items(txn)
209     def values(self, txn=None):  argument
210         if txn is not None:
211             values = self.db.values(txn)
220     def __append(self, value, txn=None):  argument
222         return self.db.append(data, txn)
224     def append(self, value, txn=None):  argument
226             return self.__append(value, txn=txn)
255     def get_both(self, key, value, txn=None, flags=0):  argument
257         data = self.db.get(key, data, txn, flags)
261     def cursor(self, txn=None, flags=0):  argument
262         c = DBShelfCursor(self.db.cursor(txn, flags))
267     def put(self, key, value, txn=None, flags=0):  argument
269         return self.db.put(key, data, txn, flags)