[Tutor] Multiple Simultaneous Loops
I roughly want to be able to do:
for f, x in bunch_of_files, range(z):
so that x iterates through my files, and y iterates through something else.
Is this something I can do?
If so, what would be the best way to create a range of indeterminate length?
If not, is there a nice way I can do it, rather than than incrementing
a variable (x = x + 1) every loop?
Or maybe can I access the number of times the loop has run? ('x = x +
1' is so common there must be some more attractive shortcut).
So far in learning Python I've founbd that when I feel you should be
able to do something, then you can. This seems a pretty intuitive
thing to want to do, so I'm sure it must be possible, but I can't find
anything on it.
Many thanks
Ed
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Re: [Tutor] Multiple Simultaneous Loops
assume:
you have two list with the same size
L1 = [1,2,3]
L2 = [11,22,33]
you can zip the L1 and L2 into L
L = zip(L1,L2) # L = [(1,11),(2,22),(3,33)]
then you can process:
for x in L:
dosomething(x[0])...
dosomething(x[1])...
I'm not so sure about your problem but
If you want to do something parallel processing then you should go to threading or pyro.
Cheers,
pujo
On 9/15/05, Ed Singleton <[EMAIL PROTECTED]> wrote:
I roughly want to be able to do:for f, x in bunch_of_files, range(z):so that x iterates through my files, and y iterates through something else.
Is this something I can do?If so, what would be the best way to create a range of indeterminate length?If not, is there a nice way I can do it, rather than than incrementinga variable (x = x + 1) every loop?
Or maybe can I access the number of times the loop has run? ('x = x +1' is so common there must be some more attractive shortcut).So far in learning Python I've founbd that when I feel you should be
able to do something, then you can. This seems a pretty intuitivething to want to do, so I'm sure it must be possible, but I can't findanything on it.Many thanksEd___
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Re: [Tutor] Multiple Simultaneous Loops
On 9/15/05, Ed Singleton <[EMAIL PROTECTED]> wrote:
> I roughly want to be able to do:
>
> for x, y in bunch_of_files, range(z):
>
> so that x iterates through my files, and y iterates through something else.
>
> Is this something I can do?
It's not fully clear to me what you want to do. Do you want to go
through each pair x,y with x in bunch_of_files and y in range(z)? Then
you can do:
for x in bunch_of_files:
for y in range(z):
Or do you want to have one value of y for each value of x? In that
case I think you'd want:
for y in range(len(bunch_of_files)):
x = bunch_of_files[y]
> If so, what would be the best way to create a range of indeterminate length?
I don't think such a thing exists. Either it has some length or it
does not. There's nothing in between.
> If not, is there a nice way I can do it, rather than than incrementing
> a variable (x = x + 1) every loop?
>
> Or maybe can I access the number of times the loop has run? ('x = x +
> 1' is so common there must be some more attractive shortcut).
See my second example above?
Andre Engels
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Re: [Tutor] Multiple Simultaneous Loops
You have a much simpler solution ! As this is a most common task to iterate on a sequence while keeping track of the index, there is an object just for that : for i,x in enumerate(iterable): # Here "i" is the index and "x" the element Also, to get some "advance" iteration schemes, have a lot at the module "itertools" ... there is a bunch of very usefull items in it (the most usefull to me bzing "izip") ! Pierre Pujo Aji a écrit : > assume: > you have two list with the same size > L1 = [1,2,3] > L2 = [11,22,33] > you can zip the L1 and L2 into L > L = zip(L1,L2) # L = [(1,11),(2,22),(3,33)] > then you can process: > for x in L: > dosomething(x[0])... > dosomething(x[1])... > I'm not so sure about your problem but > If you want to do something parallel processing then you should go to > threading or pyro. > Cheers, > pujo > > -- Pierre Barbier de Reuille INRA - UMR Cirad/Inra/Cnrs/Univ.MontpellierII AMAP Botanique et Bio-informatique de l'Architecture des Plantes TA40/PSII, Boulevard de la Lironde 34398 MONTPELLIER CEDEX 5, France tel : (33) 4 67 61 65 77fax : (33) 4 67 61 56 68 ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Multiple Simultaneous Loops
Ed Singleton wrote:
> I roughly want to be able to do:
>
> for f, x in bunch_of_files, range(z):
>
> so that x iterates through my files, and y iterates through something else.
>
> Is this something I can do?
In the general case use zip():
for f, x in zip(bunch_of_files, range(z)):
In this case, where the second item is just the index to the loop, use
enumerate() instead of range() and zip()
for x, f in enumerate(bunch_of_files):
> If so, what would be the best way to create a range of indeterminate length?
itertools.count() generates an "unlimited" sequence.
> If not, is there a nice way I can do it, rather than than incrementing
> a variable (x = x + 1) every loop?
>
> Or maybe can I access the number of times the loop has run? ('x = x +
> 1' is so common there must be some more attractive shortcut).
enumerate()
> So far in learning Python I've founbd that when I feel you should be
> able to do something, then you can.
Yep :-)
Kent
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Re: [Tutor] Multiple Simultaneous Loops
Wonderful, thank you all of you.
zip, enumerate, and count seem to do everything I want, though I do think
for f, x in bunch_of_files, range(z):
is a little more intuitive than
for f, x in zip(bunch_of_files, range(z)):
Thanks
Ed
On 15/09/05, Kent Johnson <[EMAIL PROTECTED]> wrote:
> Ed Singleton wrote:
> > I roughly want to be able to do:
> >
> > for f, x in bunch_of_files, range(z):
> >
> > so that x iterates through my files, and y iterates through something else.
> >
> > Is this something I can do?
>
> In the general case use zip():
> for f, x in zip(bunch_of_files, range(z)):
>
> In this case, where the second item is just the index to the loop, use
> enumerate() instead of range() and zip()
> for x, f in enumerate(bunch_of_files):
>
> > If so, what would be the best way to create a range of indeterminate length?
>
> itertools.count() generates an "unlimited" sequence.
>
> > If not, is there a nice way I can do it, rather than than incrementing
> > a variable (x = x + 1) every loop?
> >
> > Or maybe can I access the number of times the loop has run? ('x = x +
> > 1' is so common there must be some more attractive shortcut).
>
> enumerate()
>
> > So far in learning Python I've founbd that when I feel you should be
> > able to do something, then you can.
>
> Yep :-)
>
> Kent
>
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[Tutor] Aschenputtel problem
Hi, I wonder if there is a shorter form of the following idiom: list1 = [] list2 = [] for item in original_list: if condition(item): list1.append(item) else: list2.append(item) (optional step:) original_list[:] = list1 I call this the "Aschenputtel" problem, because it is described by the famous quote from the fairy tale as told by the Grimm brothers: "Die guten ins Töpfchen, die schlechten ins Kröpfchen." (The good ones in the pot, the bad ones in the crop) Chris signature.asc Description: OpenPGP digital signature ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] running scripts with windows
If you are a Unix head using windows run to the cygwin site and install the whole caboodle. You'll think you are back in Unix land... If thats impossible them open a DOS boc (aka Command Prompt) and type python foo.py Or even just double click the file in Windows explorer... Alan G. - Original Message - From: "Ed Hotchkiss" <[EMAIL PROTECTED]> To: Sent: Wednesday, September 14, 2005 10:58 PM Subject: [Tutor] running scripts with windows Hi everyone, I'm home for the next few weeks while I'm learning Python, and I'm not on a *NIX box, I'm using windows. How the hell do I run a Python script? Sorry if this is a 'dumb question'. -- edward hotchkiss ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] running scripts with windows
> Cygwin (http://www.cygwin.com/) It gives you a bash shell in > Windows. Actually it gives you a whole Unix environment including X Windows and over 500 unix command line tools plus GNU C, sendmail, etc etc... Alan G. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Multiple Simultaneous Loops
> for f, x in bunch_of_files, range(z): ... > Or maybe can I access the number of times the > loop has run? I think thats what enumerate does... >>> for x,y in enumerate([1,3,5]): ... print x,y ... 0 1 1 3 2 5 >>> Yep, looks like what you need. Alan G Author of the Learn to Program web tutor http://www.freenetpages.co.uk/hp/alan.gauld ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Aschenputtel problem
Christopher Arndt wrote: > Hi, > > I wonder if there is a shorter form of the following idiom: > > list1 = [] > list2 = [] > for item in original_list: > if condition(item): > list1.append(item) > else: > list2.append(item) I don't think so. You can write it as two list comprehensions which is shorter but it iterates the original list twice: list1 = [item for item in original_list if condition(item)] list2 = [item for item in original_list if not condition(item)] Kent ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] GETTING AN _.EXE VERSION OF _.PY program to run on a machine that does not have Python installed on it. (fwd)
-- Forwarded message -- Date: Wed, 14 Sep 2005 21:33:08 -0500 From: JackA <[EMAIL PROTECTED]> To: Danny Yoo <[EMAIL PROTECTED]> Subject: Re: [Tutor] GETTING AN _.EXE VERSION OF _.PY program to run on a machine that does not have Python installed on it. Sorry for the boo boo but am learning and will remember. No .DOC's. With change of "Windows" to "Console" It is working as required. Now that the need to get it working is out of the way, I will have to take a better look at Python. From what I have seen in the on line information in the course of doing this, I conclude seems to be an efficient lauguage. I'l have to see if I can find a couple of good books on it. Thanks again and Jason is also very appreciative of all the help recieved. Jack - Original Message - From: "Danny Yoo" <[EMAIL PROTECTED]> To: "JackA" <[EMAIL PROTECTED]> Cc: Sent: Tuesday, September 13, 2005 12:47 PM Subject: Re: [Tutor] GETTING AN _.EXE VERSION OF _.PY program to run on a machine that does not have Python installed on it. > > > On Mon, 12 Sep 2005, JackA wrote: > >> I am attaching a word document copy of this EMail which might be easier >> to read and follow if your EMail window rearanges things to much. > > Hi Jack, > > Actually, please don't do that. *grin* > > Word documents are actually not really usable in a programming language > forum. You're assuming that the recipients are using systems that are > capable of running Microsoft Word. You might be surprised, but this is > not necessarily true. For maximum utility, please stick to plain text > formats on Python-Tutor. The page: > >http://expita.com/nomime.html > > gives some more reasons for staying with plain text, at least on technical > mailing lists. > > > Anyway, to your question: > >> I have created PROG.EXE from PROG.PY , but it appears NOT to be portable >> in that when I try to run PROG.EXE on my wife's machine which does not >> have Python installed on it I get a " See the logfile PROG.EXE log for >> details". The logfile has the following ; >> >> >> Traceback (most recent call last): >> File "PROG.PY", line 364, in ? >> File "PROG.PY", line 320, in Main >> EOFError: EOF when reading a line > > > Ok, I have an idea of what's going on here. Let's take a look at your > 'setup.py' file. > > > >> The 6 lines of PyToExe.PY used to make PROG.EXE , is shown below >> starting with ### in line #1. >> >> ### PyToExe.PY = file name._.PY > _.EXE >> >> from distutils.core import setup >> import py2exe >> >> setup(windows=['PROG.PY']) >^^^ > > Ah. Change the line in your setup from using 'windows' to 'console'. > > > You're not making a graphical "Windows" program, but one that depends on > the console. Technially, a Microsoft Windows GUI program has no console, > and no access to standard input or output. That's why your program > breaks: it's unable to use raw_input(), since that's explicitely meant to > talk to standard input. > > > So, instead, your setup.py should look like: > > ## > from distutils.core import setup > import py2exe > > setup(console=['PROG.PY']) > ## > > > Best of wishes to you. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] GETTING AN _.EXE VERSION OF _.PY program to run on a machine that does not have Python installed on it. (fwd)
Danny Yoo schrieb: > > -- Forwarded message -- > Date: Wed, 14 Sep 2005 21:33:08 -0500 > From: JackA <[EMAIL PROTECTED]> > To: Danny Yoo <[EMAIL PROTECTED]> > Subject: Re: [Tutor] GETTING AN _.EXE VERSION OF _.PY program to run on a > machine that does not have Python installed on it. > > Sorry for the boo boo but am learning and will remember. No .DOC's. Another gentle advice: Don't use ALL CAPS WRITING in the subject of your emails. That's the equivalent to shouting in the online world and people will just think you're a jerk (which is probably not true but people will think it nevertheless). Chris ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Aschenputtel problem
> I wonder if there is a shorter form of the following idiom: Bearing in mind that shorter is not necessarily better... [condition(i) and list1.append(i) or list2.append(i) for i in original] This returns a list of booleans that we throw away but the list1,list2 containers will have been modified as required. But the original code(below) is probably more reliable and clearer! > list1 = [] > list2 = [] > for item in original_list: >if condition(item): >list1.append(item) >else: >list2.append(item) > I call this the "Aschenputtel" problem, because it is described > by the famous quote from the fairy tale as told by the > Grimm brothers: > > "Die guten ins Töpfchen, die schlechten ins Kröpfchen." > (The good ones in the pot, the bad ones in the crop) HTH, Alan G. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] running scripts with windows
>> Cygwin (http://www.cygwin.com/) It gives you a bash shell in >> Windows. > Actually it gives you a whole Unix environment including X Windows > and over 500 unix command line tools plus GNU C, sendmail, etc etc... Watch out, because cygwin-native python can conflict with win32 python, if they're both in your path. Buddy of mine had various .py files not work because of this. Alan ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Aschenputtel problem
Alan Gauld wrote: >>I wonder if there is a shorter form of the following idiom: > > > Bearing in mind that shorter is not necessarily better... > > [condition(i) and list1.append(i) or list2.append(i) for i in > original] Hmm, no, this will always evaluate list2.append(i) because the value of list1.append(i) is None. You could use [ (condition(i) and list1 or list2).append(i) for i in original ] or for i in original: (condition(i) and list1 or list2).append(i) Kent ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] running scripts with windows...slightly OT
Yeah be careful with some of the cygwin tools. I had an issue with the jar command being picked up from cygwin/bin instead of JAVA_HOME and it was corrupting the contents of a jar file. -george -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of R. Alan Monroe Sent: Thursday, September 15, 2005 5:24 PM To: tutor@python.org Subject: Re: [Tutor] running scripts with windows >> Cygwin (http://www.cygwin.com/) It gives you a bash shell in >> Windows. > Actually it gives you a whole Unix environment including X Windows and > over 500 unix command line tools plus GNU C, sendmail, etc etc... Watch out, because cygwin-native python can conflict with win32 python, if they're both in your path. Buddy of mine had various .py files not work because of this. Alan ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Aschenputtel problem
Alan Gauld schreef: >>I wonder if there is a shorter form of the following idiom: > > > Bearing in mind that shorter is not necessarily better... > > [condition(i) and list1.append(i) or list2.append(i) for i in > original] Alas, won't work. This is one of the cases where the ... and ... or ... idiom doesn't work; this is why I don't like it and don't use it. The problem is that list1.append(i) returns None, so list2.append(i) is always called, even if list1.append(i) was already called: >>> list1 = [] >>> list2 = [] >>> False and list1.append(2) or list2.append(2) >>> list1, list2 ([], [2]) >>> True and list1.append(4) or list2.append(4) >>> list1, list2 ([4], [2, 4]) -- If I have been able to see further, it was only because I stood on the shoulders of giants. -- Isaac Newton Roel Schroeven ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Please help with comparision in range of numbers
Hello group, I have a data like this in tab-delim text. 1427021_s_atchr7:102786983-102794499(+) 1452285_a_atchr7:102786983-102794499(+) 1445553_at chr7:102848766-102910961(-) 1420925_at chr7:102863841-102887410(+) 1450041_a_atchr7:102863841-102887410(+) 1447553_x_atchr7:102899711-10285(-) 1418478_at chr7:102991513-103023463(-) 1452892_at chr7:103132162-103291925(-) 1430157_at chr7:103292083-103297768(+) First column represents the identifier. Second column representes the position of the identifier on genome. Because many people might not understand genome, lets consider it as a sequence composed of A, T , G and C with lengths of thousands of thousands of ATGCs. The analogy is something like: Jill am driving from washington DC to Miami on I-95 South. Jack is driving from Miami to DC on I-95 North. If we scale the I-95 South as (-) (negative direction) from 0-10 units (arbitary) and similarly, I-95 North as (+) (positive direction) again from 0-500,000 arbitarary units. My aims is to find if Jack and Jill happen to be in Florence, south carolina then coordinates (considering that they are apart 1 or 2 miles or units distance) then they would be something like : Jackchr7:102863841-102887410(+) Jillchr7:102886711-10285(-) Then they are falling in the same range of coordinates (1028,63841-1028,87410)(1028,86711-1028,5) (between 86711 and 87410). I want to find such instances of jack and jill's that fall in the same ranges and they should be in opposite to each other. Truely, I always flunk and my mind gets blackedout when I see these number ranges. I do not know how to write : check "if a range of numbers fall in the other range of numbers" condition. tutors could any one help me please. thank u srini __ Yahoo! Mail - PC Magazine Editors' Choice 2005 http://mail.yahoo.com ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Aschenputtel problem
On 16/09/05, Kent Johnson <[EMAIL PROTECTED]> wrote: > Alan Gauld wrote: > > Bearing in mind that shorter is not necessarily better... > > > > [condition(i) and list1.append(i) or list2.append(i) for i in > > original] > > Hmm, no, this will always evaluate list2.append(i) because the value of > list1.append(i) is None. You could use > > [ (condition(i) and list1 or list2).append(i) for i in original ] This will not work either, because initially, list1 will be [] which is false. So everything will end up in list2. >>> list1, list2 = [], [] >>> [(i%2==1 and list1 or list2).append(i) for i in range(10)] [None, None, None, None, None, None, None, None, None, None] >>> list1, list2 ([], [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]) You can get around this with a dodge.. >>> list1, list2 = [], [] >>> [(i%2 == 1 and [list1] or [list2])[0].append(i) for i in range(10)] [None, None, None, None, None, None, None, None, None, None] >>> list1, list2 ([1, 3, 5, 7, 9], [0, 2, 4, 6, 8]) But I'm sure that using side-effects in a list comprehension is prohibited by at least one major religion, so really, I would just stick to a for loop :-) -- John. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Aschenputtel problem - Shorter is not better?
"Bearing in mind that shorter is not necessarily better..." Wouldn't shorter, as a rule of thumb, as in less language statements, mean fewer executions, and therefore faster? ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Aschenputtel problem
>> [condition(i) and list1.append(i) or list2.append(i) for i in >> original] > > Hmm, no, this will always evaluate list2.append(i) because > the value of list1.append(i) is None. You could use > > [ (condition(i) and list1 or list2).append(i) for i in original ] Oops! Good point, which emphasises the point about shorter not necessarily being better! My personal approach would be two separate comprehensions(*) which keeps the intent very clear and keeps it short at the expense of iterating the original list twice. (*) Or you could use the filter funtion twice if you want to make the intent even more explicit... Alan G. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Please help with comparision in range of numbers
> 1427021_s_at chr7:102786983-102794499(+) > 1452285_a_at chr7:102786983-102794499(+) > 1445553_atchr7:102848766-102910961(-) > 1420925_atchr7:102863841-102887410(+) > 1450041_a_at chr7:102863841-102887410(+) > 1447553_x_at chr7:102899711-10285(-) > 1418478_atchr7:102991513-103023463(-) > 1452892_atchr7:103132162-103291925(-) > 1430157_atchr7:103292083-103297768(+) [some text cut] > I want to find such instances of jack and jill's that fall in the same > ranges and they should be in opposite to each other. Hi Srinivas, Let's break this down into two separate problems: 1. Finding Ranges that overlap. 2. Given two Ranges, see if they're in opposite directions. I'm going to ignore problem 2 at the moment. *grin* If we don't care too much about efficiency, the following should help you solve problem 1. ## class Range(object): def __init__(self, low, high): assert low <= high self.low, self.high = low, high def is_overlapping(self, other): """Returns true if this range overlaps the other range. The exact boolean condition is copied from the classic textbook "Introduction to Algorithms, 2nd edition", section 14.3. """ return (self.low <= other.high) and other.low <= self.high ## For example: ## >>> Range(1, 2).is_overlapping(Range(2, 3)) True >>> Range(1, 2).is_overlapping(Range(3, 3)) False >>> Range(1, 2).is_overlapping(Range(-2, 0)) False >>> Range(1, 2).is_overlapping(Range(-42, 42)) True ## So if you have sequence of Ranges like this, you can brute force and just loop across all possible pairs, and do this is_overlapping() check. You may want to test this on a small sample dataset just to see that it works. This approach, however, is slow, and gets slower as the dataset grows. If we do care about efficiency, we have to do something a little smarter. Interval trees or K-d Tree data structures are examples of data structures that can help you do range-intersection queries much more quickly than a brute-force approach. There's an implementation of K-d trees in biopython: http://biopython.org/docs/api/public/Bio.KDTree-module.html so you may want to investigate this with the Biopython folks if speed is a concern. John Bentley wrote a nice survey article talking about these range-searching algorithms here: http://portal.acm.org/citation.cfm?id=356797 although you might need an ACM account to get at the article. > Truely, I always flunk and my mind gets blackedout when I see these > number ranges. I do not know how to write : check "if a range of > numbers fall in the other range of numbers" condition. Yeah, me too. Check out the book reference in the code above: it helps to clear things up about intervals and range checking. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Aschenputtel problem
Alan G schrieb: > My personal approach would be two separate comprehensions(*) which > keeps the intent very clear and keeps it short at the expense > of iterating the original list twice. Of course this works only if condition(item) yields the same result each time it is called with the same input (which should be the common case). Also, iterating twice over the list could be expensive if the condition(item) call takes comparatively long. Chris ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Boa-Constructor
> Luis, > > I was actually asking how usable Boa-Constructor is right now for project > purposes, since I had "heard" it was kind of unstable and crashes a lot. Is > that your experience with Boa-Constructor? Or was the information I found > misleading? > > Thanks, > Terry I found Boa-constructor interesting/useful. Since this was sometime ago, and wxPython has since gained a few version numbers, I can't comment on its current stability. It was fine when I tried it, little bloated though. I'm a committed emacs user now. Luis ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Aschenputtel problem
At 10:12 AM 9/15/2005, Christopher Arndt wrote: Hi,I wonder if there is a shorter form of the following idiom:list1 = []list2 = []for item in original_list: if condition(item): list1.append(item) else: list2.append(item)Consider (5 lines instead of 7):lists = [[], []]for item in original_list: lists[condition(item)].append(item)list1 = lists[0]list2 = lists[1]This assumes condition() returns 0 or 1 (True)or if you don't mind the result in sets (assumes unique elements):set1 = set([x for x in original_list if cond(x)])set2 = original_list - set1 I can't send mail my usual way due to unknown problems. So am using gmail. Please relpy as always to [EMAIL PROTECTED] ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
