Dino Viehland wrote:
Not too long ago I prototyped a frames implementation including making
_getframe work - but it doesn't include locals in the frames. I guess in this
case it would work just fine.
The downside is it results in a 50% perf degrade on Pybench when calling
recursive functions. But we're already really fast calling functions so maybe
that's acceptable. Anyway it's something we can consider for a post-2.0
release (maybe w/ a command line option to control its presence) but I came up
with the prototype too late to go adding it to 2.0.
A frames implementation with a per engine switch would be fantastic! I'm
sure you can work on performance. :-)
Michael
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Michael Foord
Sent: Friday, September 19, 2008 5:27 AM
To: Discussion of IronPython
Subject: [IronPython] Named Tuple and IronPython 2
Hello all,
At PyCon UK Raymond Hettinger showed off the Named Tuple; a very useful recipe
for creating tuples with named fields. It is becoming part of the standard
library in Python 2.6.
http://code.activestate.com/recipes/500261/
>>> from namedtuple import namedtuple
>>> thing = namedtuple('thing', ('whizz', 'pop')) >>> thing <class '__builtin__.thing'>
>>> i = thing(1, 2) >>> i.whizz
1
>>> i.pop
2
>>> w, p = i
>>> w, p
(1, 2)
>>> i
thing(whizz=1, pop=2)
>>>
I've attached a modified version that works with IronPython 2 B5 (it doesn't
work with 2B4 due to a very odd bug that is now fixed).
The only change needed was to comment out the use of 'sys._getframe'
which is there for pickle support.
It is only conditionally used, because Jython didn't support this either
- but on Jython _getframe wasn't defined at all so the conditional check fails
on IronPython:
# Bypass this step in enviroments where
# sys._getframe is not defined (Jython for example).
if hasattr(_sys, '_getframe'):
result.__module__ = _sys._getframe(1).f_globals['__name__']
I'll suggest a modification to the recipe that works with IronPython. A better
solution would be to implement '_getframe' of course... :-)
Michael Foord
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