[Python-Dev] Switch statement

[Michael Walter]

Maybe "switch" became a keyword with the patch..

Regards,
Michael

On 6/12/06, M.-A. Lemburg <mal at egenix.com> wrote:
> 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
>
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