On 10/29/05, Nick Coghlan <[EMAIL PROTECTED]> wrote: > Another point in PEP 352's favour, is that it makes it far more feasible to > implement something like PEP 344 by providing "__traceback__" and > "__prev_exc__" attributes on BaseException.
Not sure if I'm fully in-context here, but watch out for __traceback__ and garbage collection, since the traceback objects refer to all the frames. I expect there's a significant amount of code out there that expects Exception instances to be reasonably persistent. At least Twisted does, with its encapsulation of Exceptions for the purposes of asynchrony -- Failure objects. These Failure objects also refer to tracebacks, but we had to be very careful about deleting them fairly quickly because of GC issues. After deletion they simply contain an inert, basically stringified copy of the traceback. On an only semi-related note, at one point I tried making it possible to have longer-lived Traceback objects that could be reraised, but found it very hard to do, at least with my self-imposed requirement of keeping it in an extension module. http://mail.python.org/pipermail/python-dev/2005-September/056091.html -- Twisted | Christopher Armstrong: International Man of Twistery Radix | -- http://radix.twistedmatrix.com | Release Manager, Twisted Project \\\V/// | -- http://twistedmatrix.com |o O| | w----v----w-+ _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
