from shelve import Shelf

class DbfilenameShelf(Shelf):
    """Shelf implementation using the "anydbm" generic dbm interface.

    This is initialized with the filename for the dbm database.
    See the module's __doc__ string for an overview of the interface.
    """

    def __init__(self, filename, flag='c'):
        import dumbdbm_patched
        Shelf.__init__(self, dumbdbm_patched.open(filename, flag))


def open(filename, flag='c'):
    """Open a persistent dictionary for reading and writing.

    Argument is the filename for the dbm database.
    See the module's __doc__ string for an overview of the interface.
    """

    return DbfilenameShelf(filename, flag)