[Python-ideas] "While" suggestion

[Andrew Akira Toulouse]

Point taken -- it's a very valid point, but at the same time building an
unnecessary list isn't really all that good-looking. Being able to do
query-like things is very useful, and I'd prefer to do it as close to the
Python core as possible, rather than (for example) creating a in-memory
sqlite database or something. LINQ, I think, somewhat validates this point
of view. I feel that an integrated way to query data would be a useful
addition. List comprehensions seem to be the natural Pythonic way to do
this, but if you can think of something better...

On Tue, Jul 29, 2008 at 3:15 AM, Roman Susi <rnd at onego.ru> wrote:

> hi!
>
> Jacob Rus wrote:
> > Andrew Akira Toulouse wrote:
>
> ...
>
> > Personally, I'd rather have this broken up than in one gigantic line
> > that looks like:
> >
> >     result = [int(line) for line in f if evenP(int(line))
> >               until int(line) == 0 with open(filename) as f]
>
>
> I have not followed the thread, but the line above looks cool and
> terrible at the same time.
>
> I can't think what other operator can be squeezed into expression, maybe
> try-except, eh?
>
>     result = [int(line) for line in f try if evenP(int(line))
>               until int(line) == 0 except ValueError("blabla")
>               with open(filename) as f]
>
>
> I am not sure if this kind of SQLness should enter Python syntax at all...
>
> Regards,
> Roman
>
> >
> > As for:
> >
> >>     tokenchecks = [token for regex,token in match_tok until
> >> regex.match(s)]     return tokenchecks[-1]
> >
> > This is much more readably expressed as:
> >
> > for regexp, token in match_tok:
> >     if regexp.match(s):
> >         return token
> >
> >
> > Cheers,
> > Jacob Rus
> >
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