Python-сообщество

#!/usr/bin/env python
# -*- coding: utf-8 -*-
import shelve
f = shelve.open('data.db')

Traceback (most recent call last):
  File "os.py", line 8, in <module>
    bd = shelve.open("data.dat")
  File "/usr/lib/python3.4/shelve.py", line 239, in open
    return DbfilenameShelf(filename, flag, protocol, writeback)
  File "/usr/lib/python3.4/shelve.py", line 223, in __init__
    Shelf.__init__(self, dbm.open(filename, flag), protocol, writeback)
  File "/usr/lib/python3.4/dbm/__init__.py", line 88, in open
    raise error[0]("db type could not be determined")