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On Sat, 26 Jun 2010 13:03:38 +0200 "M.-A. Lemburg" firstname.lastname@example.org wrote:
Greg Ewing wrote:
I'm interested in a feature which allows users to discard the locals and globals references from frames held by a traceback object.
Wouldn't it be better to write safer code and not store a reference to the traceback object in the first place ?
In Python 3, tracebacks are stored as an attribute of the corresponding exception:
try: 1/0 ... except Exception as _: e = _ ... e.__traceback__
<traceback object at 0x7ff69fdbf908>
Also: What's the use case for creating traceback objects outside the Python interpreter core ?
He's not talking about creating traceback objects outside the core, but being able to reuse tracebacks created by the core without keeping alive a whole chain of objects.
It's a real need when you want to do careful error handling/reporting without wasting too many resources. As already mentioned, Twisted has a bunch of code to work around that problem, since errors can be quite long-lived in a pipelined asynchronous execution model.