Re: [Python-Dev] for loop with if filter
On 16/11/2007, Gustavo Carneiro [EMAIL PROTECTED] wrote: Yes, I can do that, as well as I can use the 'continue' statement, but both versions are slightly more verbose and less clear than what I propose. This should go to python-ideas, I guess. (FWIW, I can see the attraction of the idea, but I don't think it's worth the cost in terms of new syntax, subtle corner cases, etc etc). Paul. ___ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
Re: [Python-Dev] for loop with if filter
On 16/11/2007, Benji York [EMAIL PROTECTED] wrote: Gustavo Carneiro wrote: I am finding myself often doing for loops over a subset of a list, like: for r in results: if r.numNodes != numNodes: continue # do something with r It would be nice if the plain for loop was as flexible as list comprehensions and allowed an optional if clause, like this: for r in results if r.numNodes == numNodes: # do something with r You can do the same today, sans sugar: for r in (s for s in results if s.numNodes == numNodes): # do something with r Yes, I can do that, as well as I can use the 'continue' statement, but both versions are slightly more verbose and less clear than what I propose. -- Gustavo J. A. M. Carneiro INESC Porto, Telecommunications and Multimedia Unit The universe is always one step beyond logic. -- Frank Herbert ___ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
Re: [Python-Dev] for loop with if filter
Gustavo Carneiro wrote: I am finding myself often doing for loops over a subset of a list, like: for r in results: if r.numNodes != numNodes: continue # do something with r It would be nice if the plain for loop was as flexible as list comprehensions and allowed an optional if clause, like this: for r in results if r.numNodes == numNodes: # do something with r You can do the same today, sans sugar: for r in (s for s in results if s.numNodes == numNodes): # do something with r -- Benji York http://benjiyork.com ___ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
Re: [Python-Dev] for loop with if filter
I started thinking about itertools when I saw this then I realised that your question was about changing the syntax to produce fewer lines of code rather than writing more effiicient code.. seemed like a case where you could use ifilter. //Martin are talking about cvhanging the syntax rQuoting Gustavo Carneiro [EMAIL PROTECTED]: I am finding myself often doing for loops over a subset of a list, like: for r in results: if r.numNodes != numNodes: continue # do something with r It would be nice if the plain for loop was as flexible as list comprehensions and allowed an optional if clause, like this: for r in results if r.numNodes == numNodes: # do something with r Has this idea come up before? Does anyone else like this idea? -- Gustavo J. A. M. Carneiro INESC Porto, Telecommunications and Multimedia Unit The universe is always one step beyond logic. -- Frank Herbert ___ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
[Python-Dev] for loop with if filter
I am finding myself often doing for loops over a subset of a list, like: for r in results: if r.numNodes != numNodes: continue # do something with r It would be nice if the plain for loop was as flexible as list comprehensions and allowed an optional if clause, like this: for r in results if r.numNodes == numNodes: # do something with r Has this idea come up before? Does anyone else like this idea? -- Gustavo J. A. M. Carneiro INESC Porto, Telecommunications and Multimedia Unit The universe is always one step beyond logic. -- Frank Herbert ___ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
Re: [Python-Dev] for loop with if filter
2007/11/16, Gustavo Carneiro [EMAIL PROTECTED]: Yes, I can do that, as well as I can use the 'continue' statement, but both versions are slightly more verbose and less clear than what I propose. The question is: is this slightly more verbosity and less clarity worth enough as to make a syntax change in the language? Personally, my answer is No. -- .Facundo Blog: http://www.taniquetil.com.ar/plog/ PyAr: http://www.python.org/ar/ ___ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
Re: [Python-Dev] for loop with if filter
Gustavo Carneiro [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] |I am finding myself often doing for loops over a subset of a list, like: | |for r in results: |if r.numNodes != numNodes: |continue |# do something with r Why write it backwards? for r in results: if r.numNodes == numNodes # do something with r is the direct parallel with the below code. | It would be nice if the plain for loop was as flexible as list | comprehensions and allowed an optional if clause, like this: | |for r in results if r.numNodes == numNodes: |# do something with r Same as above with ':\n' deleted. A trivial difference. An optional if clause is *less* flexible than an optional if statement and block. | Has this idea come up before? Does anyone else like this idea? Yes, and Guido rejected at that time. tjr ___ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
Re: [Python-Dev] for loop with if filter
* Terry Reedy [EMAIL PROTECTED] [2007-11-16 18:31:12 -0500]: Gustavo Carneiro [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] |I am finding myself often doing for loops over a subset of a list, like: | |for r in results: |if r.numNodes != numNodes: |continue |# do something with r Why write it backwards? for r in results: if r.numNodes == numNodes # do something with r is the direct parallel with the below code. The extra level of indentation is awkward. -- mithrandi, i Ainil en-Balandor, a faer Ambar signature.asc Description: Digital signature ___ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
