[Python-ideas] Standard way to get caller name and easy call stack access

[Andrew McNabb]

On Thu, Mar 22, 2012 at 09:24:40AM +0000, Mark Shannon wrote:
> >If sys._getframe() is not available in Jython, IronPython and PyPy
> >then I won't use that for debug mode output in libraries.
> 
> sys._getframe() is available in PyPy and Jython, I'm not sure if
> IronPython supports it, I think it does.
> 
> A simpler and more concrete suggestion might be to simply rename
> sys._getframe() as sys.getframe(), since all the main implementations
> support it anyway.

Apparently sys._getframe is only partially supported in PyPy. It works
but probably shouldn't be encouraged because it has a huge performance
hit:

"sys._getframe(), sys.exc_info() work, but they give performance penalty
that can be huge, by disabling the JIT. Use only for specialized use
cases (like a debugger) where performance does not matter.

"One unobvious usecase where this is used is the logging module. Don't
use logging module if you want things to be fast."

https://bitbucket.org/pypy/pypy/wiki/JitFriendliness

--
Andrew McNabb
http://www.mcnabbs.org/andrew/
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