[IronPython] Named Tuple and IronPython 2
fuzzyman at voidspace.org.uk
Sun Sep 21 22:02:49 CEST 2008
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. :-)
> -----Original Message-----
> From: users-bounces at lists.ironpython.com [mailto:users-bounces at lists.ironpython.com] 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.
> >>> from namedtuple import namedtuple
> >>> thing = namedtuple('thing', ('whizz', 'pop')) >>> thing <class '__builtin__.thing'> >>> i = thing(1, 2) >>> i.whizz
> >>> i.pop
> >>> 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
> Users mailing list
> Users at lists.ironpython.com
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