[pypy-dev] question about core implementation language
logistix at zworg.com
Mon Jan 20 00:23:03 CET 2003
"Edward K. Ream" <edream at tds.net> wrote:
> > I have started some prototyping in Python, and I now
> > remember some words of Guido, that Python isn't specially
> > well suited for such a task. I admit, there is some
> > truth in it.
> I don't understand Guido's comment. I personally think Python is absolutely
> superb for any prototyping endeavor.
> Perhaps I am being dense, but the fact that Python doesn't have feature x of
> language y seems totally a non-issue. You want a switch statement? Write a
> psyco_switch function (in Python, of course). Ditto for anything else your
> heart desires. Eventually _everything_ that generates code is going to
> become assembly code, but that is no problem at all for any compiler.
> Perhaps I am confusing levels of discussion or implementation. However, the
> way I see it, the most important thing is to do experimentation with
> algorithms. To do that, the essential thing is to compare various ways of
> doing things, at as high a level as possible. In other words, a
> psyco_switch routine provides a good enough model for the task at hand.
> Ditto for any other construct you want.
> Actually, for experimentation (perhaps leading to inspiration) I wouldn't
> necessarily confine myself to any particular level of implementation or
> design or whatever. I would simply blast away using whatever language tools
> appear to be most useful. Armin has talked about doing high-level work with
> discovering list optimizations, for example. I don't understand what the
> lack of a Python switch statement has to do with such matters.
> In short, I would hardly bother at all with questions of the level at which
> Python is modeling some implementation. I would use whatever works in
> Python and worry about mapping that back to a final implementation only
> after it is clear that Python in Python will be a big win. At that time we
> will have lots more data, energy and incentive to do the needed grunt work.
> Until then, I wouldn't let implementation problems get in the way of
> Just my $0.02.
> pypy-dev mailing list
> pypy-dev at codespeak.net
I think the point is that Python as a language provides absolutely no
access to the machine internals. You can't examine memory contents,
registers, I/O bus or call code directly. As part of the bootstrap
process the following four functions should probably be added to the
interperter (either as builtin functions or a module):
Other than that, everything could (eventually) be written in Python.
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