[Python-3000] Strange code in bsddb that doesn't work in Python 3.0

[Jesus Cea]

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Trying to find why I can't import bsddb in python3.0, I have found that
this code fails:

"""
~    /* Some magic to make DBNotFoundError and DBKeyEmptyError derive
~     * from both DBError and KeyError, since the API only supports
~     * using one base class. */
~    PyDict_SetItemString(d, "KeyError", PyExc_KeyError);
~    PyRun_String("class DBNotFoundError(DBError, KeyError): pass\n"
~                 "class DBKeyEmptyError(DBError, KeyError): pass",
~                 Py_file_input, d, d);
~    DBNotFoundError = PyDict_GetItemString(d, "DBNotFoundError");
~    DBKeyEmptyError = PyDict_GetItemString(d, "DBKeyEmptyError");
~    PyDict_DelItemString(d, "KeyError");
"""

"Some magic" comment is a bit scary :-), although the code seems fairly
obvious.

This code works in Python 2.x, but fails in 3.0.

The line that fails is "PyRun_String()". The error is: "ImportError:
__build_class__ not found".

:-?

Ideas welcomed!

The code should work in python2.[3-6] and python3.0. Conditional
compilation can be used.

PS: Googling around, I see that Python 2.5 allows a tuple being used as
base for exception creation.  Is this available in Python3.0?. Searching
for "PyErr_NewException" in 3.0 documentation online shows no results.

Ok, the index show the function. It should work.

I'm still interested in knowing WHY the original code fails.

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