itertools comments [Was: Re: RELEASED: Python 2.3a2]
Chad Netzer
cnetzer at mail.arc.nasa.gov
Thu Feb 20 16:01:59 EST 2003
On Thu, 2003-02-20 at 07:53, Alexander Schmolck wrote:
> Guido van Rossum <guido at python.org> writes:
> > - new module itertools: efficient looping constructs
> Wouldn't `xfilter`, `xmap` etc. be a better naming convention than
> `ifilter`, `imap` etc? I'd propose this change for 2 reasons:
FWIW, I agree with your reasoning here. Since we are stuck with xrange,
the new names should be consistent.
> Finally, among the tools I've cooked up myself over time and that aren't
> already covered by what's in the new module, I find the following 2
> (especially the first) to be the most useful and worthy of addition:
>
> def xgroup(iter,n=2):
[snip]
> def xwindow(iter, n=2, s=1):
[snip]
> A last thing, I think a `cycle` generator would be an really useful idiom to
> have, as it provides a much more readable and less errorprone way to achieve
> many of the things one normally has to use an awkward modulus construct
> for.
I like xgroup and xcycle, but xwindow could be a confusing name (and is
arguably less often needed than xgroup). Any alternative names for
xwindow? Also, is there any (non-obfuscated) way to get xgroup()
functionality from zip()? It doesn't seem so.
At least there is now an izip() in itertools (although, again, I would
prefer the 'x' naming, or the addition of irange() and the deprecation
of xrange())
--
Bay Area Python Interest Group - http://www.baypiggies.net/
Chad Netzer
(any opinion expressed is my own and not NASA's or my employer's)
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