Mailing List Archive: Sequence splitting

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Sequence splitting

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schickb at gmail

Jul 2, 2009, 7:56 PM

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Sequence splitting

I have fairly often found the need to split a sequence into two groups
based on a function result. Much like the existing filter function,
but returning a tuple of true, false sequences. In Python, something
like:

def split(seq, func=None):
if func is None:
func = bool
t, f = [], []
for item in seq:
if func(item):
t.append(item)
else:
f.append(item)
return (t, f)

The discussion linked to below has various approaches for doing this
now, but most traverse the sequence twice and many don't apply a
function to spit the sequence.
http://stackoverflow.com/questions/949098/python-split-a-list-based-on-a-condition

Is there any interest in a C implementation of this? Seems too trivial
to write a PEP, so I'm just trying to measure interest before diving
in. This wouldn't really belong in intertool. Would it be best
implemented as a top level built-in?

-Brad
--
http://mail.python.org/mailman/listinfo/python-list

Subject	User	Time
Sequence splitting	schickb at gmail	Jul 2, 2009, 7:56 PM
Re: Sequence splitting	tn.pablo at gmail	Jul 2, 2009, 8:10 PM
Re: Sequence splitting	http://phr.cx at NOSPAM	Jul 2, 2009, 8:14 PM
Re: Sequence splitting	schickb at gmail	Jul 2, 2009, 8:55 PM
Re: Sequence splitting	tn.pablo at gmail	Jul 2, 2009, 8:17 PM
Re: Sequence splitting	schickb at gmail	Jul 2, 2009, 8:56 PM
Re: Sequence splitting	http://phr.cx at NOSPAM	Jul 2, 2009, 9:08 PM
Re: Sequence splitting	schickb at gmail	Jul 2, 2009, 9:34 PM
Re: Sequence splitting	tn.pablo at gmail	Jul 2, 2009, 9:40 PM
Re: Sequence splitting	http://phr.cx at NOSPAM	Jul 2, 2009, 9:58 PM
Re: Sequence splitting	gagsl-py2 at yahoo	Jul 2, 2009, 11:31 PM
Re: Sequence splitting	schickb at gmail	Jul 2, 2009, 11:31 PM
Re: Sequence splitting	schickb at gmail	Jul 2, 2009, 11:34 PM
Re: Sequence splitting	ricli85 at gmail	Jul 2, 2009, 11:46 PM
Re: Sequence splitting	lie.1296 at gmail	Jul 3, 2009, 12:16 AM
Re: Sequence splitting	tsangpo.newsgroup at gmail	Jul 3, 2009, 2:03 AM
Re: Sequence splitting	lie.1296 at gmail	Jul 3, 2009, 6:10 AM
Re: Sequence splitting	lie.1296 at gmail	Jul 3, 2009, 12:31 AM
Re: Sequence splitting	steve at REMOVE-THIS-cybersource	Jul 3, 2009, 12:57 AM
Re: Sequence splitting	http://phr.cx at NOSPAM	Jul 3, 2009, 1:02 AM
Re: Sequence splitting	steve at REMOVE-THIS-cybersource	Jul 3, 2009, 1:26 AM
Re: Sequence splitting	http://phr.cx at NOSPAM	Jul 3, 2009, 1:39 AM
Re: Sequence splitting	steve at REMOVE-THIS-cybersource	Jul 3, 2009, 2:50 AM
Re: Sequence splitting	mwilson at the-wire	Jul 3, 2009, 12:08 PM
Re: Sequence splitting	python at mrabarnett	Jul 3, 2009, 1:07 PM
Re: Sequence splitting	schickb at gmail	Jul 3, 2009, 10:03 AM
Re: Sequence splitting	Scott.Daniels at Acm	Jul 3, 2009, 10:47 AM
Re: Sequence splitting	clp2 at rebertia	Jul 3, 2009, 1:12 AM
Re: Sequence splitting	p.f.moore at gmail	Jul 3, 2009, 4:01 AM
Re: Sequence splitting	tn.pablo at gmail	Jul 3, 2009, 5:34 AM
Re: Sequence splitting	http://phr.cx at NOSPAM	Jul 3, 2009, 10:14 AM
Re: Sequence splitting	tjreedy at udel	Jul 3, 2009, 12:27 PM
Re: Sequence splitting	lie.1296 at gmail	Jul 3, 2009, 10:27 AM
Re: Sequence splitting	tjreedy at udel	Jul 3, 2009, 12:23 PM
Re: Sequence splitting	http://phr.cx at NOSPAM	Jul 3, 2009, 12:41 PM

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