Stefan Behnel added the comment:
Ah, right - chaining only happens automatically when the exception has already
been caught and moved to sys.exc_info.
There's a _PyErr_ChainExceptions(), though, which does it for you. You should
be able to say
PyErr_Fetch(&x,&y,&z)
PyErr_SetString()
_PyErr_ChainExceptions(x,y,z)
(does pretty much what your code does as well)
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