[pybsddb] bsddb.db.DBNoSuchFileError on DBEnv.open

[solsTiCe d'Hiver]

hi.
First issue
================
I am trying to open (create) a new environment with

from bsddb import db
env = db.DBEnv(db.DB_CREATE|db.DB_INIT_MPOOL)
env.open('.db4')

and this fails with:
Traceback (most recent call last):
  File "t.py", line 3, in <module>
    env.open('.db4')
bsddb.db.DBNoSuchFileError: (2, 'No such file or directory')

It must be something obvious I am not seeing now. 
Note: I have a directory named .db4
Also specifying it by absolute path change nothing
I tried with None as db_home, it's the same

I use python 2.6.5 with a patch to fix issue #6949
http://bugs.python.org/issue6949
you could look at the patch here http://pastebin.com/Xhpd3Csv

I tried without the patch.
I tried python 2.6.6 with and without the patch

I, then, updraded to db 4.8.30 (from 4.8.26)

I then tried bsddb3-5.0.0 with
from bsddb3 import db
env = db.DBEnv(db.DB_CREATE|db.DB_INIT_MPOOL)
env.open('.db4')

and still get the same problem

Second Issue
================
also in the doc, DBEnv() is said to accept flags keyword but in effect
you can't use it because you get TypeError: DBEnv() takes no keyword
arguments
so either the doc is incorrect
http://www.jcea.es/programacion/pybsddb_doc/dbenv.html#dbenv-methods
or the implementation is wrong

also DBEnv.open() is also said to accept flags keyword but you get the
same error if you use flags keyword