:; python
Python 2.4.3 (#1, Jan 22 2007, 17:39:03) 
[GCC 4.0.1 (Apple Computer, Inc. build 5250)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import rdflib
>>> g = rdflib.Graph('SQLite') 
__main__:1: DeprecationWarning: Use ConjunctiveGraph instead. ( from rdflib.Graph import ConjunctiveGraph )
>>> g.open('db')
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "build/bdist.darwin-8.10.1-i386/egg/rdflib/Graph.py", line 953, in open
  File "build/bdist.darwin-8.10.1-i386/egg/rdflib/Graph.py", line 317, in open
  File "build/bdist.darwin-8.10.1-i386/egg/rdflib/store/SQLite.py", line 44, in open
pysqlite2.dbapi2.OperationalError: unable to open database file
>>> g.open('./db', create=True)
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "build/bdist.darwin-8.10.1-i386/egg/rdflib/Graph.py", line 953, in open
  File "build/bdist.darwin-8.10.1-i386/egg/rdflib/Graph.py", line 317, in open
  File "build/bdist.darwin-8.10.1-i386/egg/rdflib/store/SQLite.py", line 44, in open
pysqlite2.dbapi2.OperationalError: unable to open database file

"""
Now:

    def open(self, home, create=True):
        """
        Opens the store specified by the configuration string. If
        create is True a store will be created if it does not already
        exist. If create is False and a store does not already exist
        an exception is raised. An exception is also raised if a store
        exists, but there is insufficient permissions to open the
        store."""
        if create:
            db = dbapi2.connect(os.path.join(home,self.identifier))

(from http://rdflib.googlecode.com/svn/trunk/rdflib/store/SQLite.py)

So:
"""
>>> print g.identifier
LMErUxLM0
>>> import os
>>> os.path.join('db', g.identifier)
u'db/LMErUxLM0'
>>> 
adw27@feldspar:~/Documents/workspace/sparql-scratch 532 $
:; mkdir db
adw27@feldspar:~/Documents/workspace/sparql-scratch 533 $
:; python
Python 2.4.3 (#1, Jan 22 2007, 17:39:03) 
[GCC 4.0.1 (Apple Computer, Inc. build 5250)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import rdflib
>>> g = rdflib.Graph('SQLite')
__main__:1: DeprecationWarning: Use ConjunctiveGraph instead. ( from rdflib.Graph import ConjunctiveGraph )
>>> g.open('db')
1