There is another issue: exception chain is not set up on exception creation in python code, only on throwing. Thus I have to assign `__context__` and `__cause__` attributes manually if I want to call `future.set_exception(exc)` instead of `raise exc`.
See aiohttp code for usage example: https://github.com/KeepSafe/aiohttp/blob/931efbd518d0d99522d1cd36b43620657cd07304/aiohttp/client.py#L522 On Thu, Mar 26, 2015 at 11:11 AM, Serhiy Storchaka <storch...@gmail.com> wrote: > On 26.03.15 10:08, victor.stinner wrote: >> >> https://hg.python.org/peps/rev/7daf3bfd9586 >> changeset: 5741:7daf3bfd9586 >> user: Victor Stinner <victor.stin...@gmail.com> >> date: Thu Mar 26 09:08:08 2015 +0100 >> summary: >> New PEP 490: Chain exceptions at C level > > >> +Python 3.5 introduces a new private ``_PyErr_ChainExceptions()`` function >> which >> +is enough to chain manually exceptions. > > > It also was added in Python 3.4.3. > > I meditar about adding _PyErr_ReplaceException() in 2.7 for simpler > backporting patches from 3.x. > >> +Functions like ``PyErr_SetString()`` don't chain automatically >> exceptions. To >> +make usage of ``_PyErr_ChainExceptions()`` easier, new functions are >> added: >> + >> +* PyErr_SetStringChain(exc_type, message) >> +* PyErr_FormatChaine(exc_type, format, ...) > > > Typo. > >> +* PyErr_SetNoneChain(exc_type) >> +* PyErr_SetObjectChain(exc_type, exc_value) > > > I would first make these functions private, as _PyErr_ChainExceptions(). > After proofing their usefulness in the stdlib, they can be made public. > > _______________________________________________ > Python-Dev mailing list > Python-Dev@python.org > https://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: > https://mail.python.org/mailman/options/python-dev/andrew.svetlov%40gmail.com -- Thanks, Andrew Svetlov _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
