[Python-Dev] Catching exceptions and convert them to warnings in C level code (was: Re: Pronouncement needed in issue9675)

[Jesus Cea]

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On 28/09/10 18:00, Antoine Pitrou wrote:
> By "fails" you mean "crashes the interpreter".
> While the deprecation warning can be discussed, bsddb shouldn't crash
> when PyCObject_FromVoidPtr() returns NULL, but instead bail out
> cleanly (or perhaps even ignore the error and simply display a warning
> that the C API won't be available).

I plan to deploy two patches for this issue. One, bsddb surviving the
warning->error flag. The other, changing the deprecation warning in
"CObject" to a py3k warning.

While doing this, I think would be useful if bsddb could intercept the
exception and provide sensible feedback without raising an exception at
import time. I have checked
<http://docs.python.org/c-api/exceptions.html>. "PyErr_Fetch" is a bit
overkill, it seems.

My idea is to convert the CObject exception in bsddb to print a warning
like "CObject creation failed. The bsddb.cAPI will be not available.
Reason is: XXXX".

Is there a "canonical way" of doing this?. Sorry if the answer is trivial...

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