Thomas Lee wrote: > Hi all, > > As the subject of this e-mail says, the attached patch adds a "switch" > statement to the Python language. > > However, I've been reading through PEP 275 and it seems that the PEP > calls for a new opcode - SWITCH - to be added to support the new > construct. > > I got a bit lost as to why the SWITCH opcode is necessary for the > implementation of the PEP. The reasoning seems to be > improving performance, but I'm not sure how a new opcode could improve > performance. > > Anybody care to take the time to explain this to me, perhaps within the > context of my patch?
Could you upload your patch to SourceForge ? Then I could add it to the PEP. Thomas wrote a patch which implemented the switch statement using an opcode. The reason was probably that switch works a lot like e.g. the for-loop which also opens a new block. Could you explain how your patch works ? BTW, I think this part doesn't belong into the patch: > Index: Lib/distutils/extension.py > =================================================================== > --- Lib/distutils/extension.py (revision 46818) > +++ Lib/distutils/extension.py (working copy) > @@ -185,31 +185,31 @@ > continue > > suffix = os.path.splitext(word)[1] > - switch = word[0:2] ; value = word[2:] > + switch_word = word[0:2] ; value = word[2:] -- Marc-Andre Lemburg eGenix.com Professional Python Services directly from the Source (#1, Jun 12 2006) >>> Python/Zope Consulting and Support ... http://www.egenix.com/ >>> mxODBC.Zope.Database.Adapter ... http://zope.egenix.com/ >>> mxODBC, mxDateTime, mxTextTools ... http://python.egenix.com/ ________________________________________________________________________ 2006-07-03: EuroPython 2006, CERN, Switzerland 20 days left ::: Try mxODBC.Zope.DA for Windows,Linux,Solaris,FreeBSD for free ! :::: _______________________________________________ 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
