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I'm having a bit of problem using the shelve module on linux

Here's a simple test script:
---------------------
#!/usr/bin/env python

import shelve

d = shelve.open("test.dbm", "c")
d["test"] = "haha"
d.close()

d= shelve.open("test.dbm")
print d["test"]
d.close()
-----------------------

On NT, it works fine.
on RedHat Linux 6.0 (2.2.7), it gives this error message:

Traceback (innermost last):
File "./test.py", line 11, in ?
d= shelve.open("test.dbm")
File "/usr/lib/python1.5/shelve.py", line 152, in open
return DbfilenameShelf(filename, flag)
File "/usr/lib/python1.5/shelve.py", line 142, in __init__
Shelf.__init__(self, anydbm.open(filename, flag))
File "/usr/lib/python1.5/anydbm.py", line 83, in open
raise error, "db type could not be determined"
anydbm.error: db type could not be determined


is this a problem with the way python is configured on my system or
something else?

thanks
jp