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
[Python-Dev] Summary of Tracker Issues
ACTIVITY SUMMARY (11/09/07 - 11/16/07) Tracker at http://bugs.python.org/ To view or respond to any of the issues listed below, click on the issue number. Do NOT respond to this message. 1323 open (+13) / 11612 closed (+25) / 12935 total (+38) Open issues with patches: 418 Average duration of open issues: 691 days. Median duration of open issues: 799 days. Open Issues Breakdown open 1318 (+13) pending 5 ( +0) Issues Created Or Reopened (39) ___ Garbage collection not working correctly in Python 2.3 11/09/07 CLOSED http://bugs.python.org/issue1405reopened tiran py3k: pythonw.exe fails because std streams a missing11/10/07 CLOSED http://bugs.python.org/issue1415created tiran py3k @prop.setter decorators 11/10/07 CLOSED http://bugs.python.org/issue1416created gvanrossum patch Weakref not working properly 11/10/07 CLOSED http://bugs.python.org/issue1417created MHOOO Python/hypot.c is never used 11/10/07 CLOSED http://bugs.python.org/issue1418created marketdickinson ssl module version 1.10 causes TypeError when accepting connecti 11/11/07 CLOSED http://bugs.python.org/issue1419created complex Unicode literals in tokenize.py and tests. 11/11/07 CLOSED http://bugs.python.org/issue1420created ron_adam py3k, patch python.org: outdated and false information 11/11/07 CLOSED http://bugs.python.org/issue1421created tiran Writing to an invalid fd doesn't raise an exception 11/11/07 CLOSED http://bugs.python.org/issue1422created tiran py3k wave sunau aifc 16bit errors 11/11/07 http://bugs.python.org/issue1423created jeroen py3k: readline and rlcompleter doesn't list choices 11/11/07 CLOSED http://bugs.python.org/issue1424created tiran py3k readline: no display matches hook set11/11/07 CLOSED http://bugs.python.org/issue1425created tiran py3k readline module needs a review 11/11/07 CLOSED http://bugs.python.org/issue1426created tiran py3k Error in standard module calendar11/11/07 CLOSED http://bugs.python.org/issue1427created gdamjan patch Update to property.__doc__ 11/11/07 CLOSED http://bugs.python.org/issue1428created tiran patch FD leak in SocketServer 11/12/07 http://bugs.python.org/issue1429created luke-jr Installing on Vista asks to close Explorer (and Nokia PC Suite) 11/12/07 CLOSED http://bugs.python.org/issue1430created dabarlow pth files not loaded at startup 11/12/07 http://bugs.python.org/issue1431created gbloisi patch Strange behavior of urlparse.urljoin 11/13/07 http://bugs.python.org/issue1432created yan marshal roundtripping for unicode11/13/07
Re: [Python-Dev] Python Library Addition: First-class Procedure Signatures
On Nov 15, 2007 12:48 PM, Steven Bethard <[EMAIL PROTECTED]> wrote: > On Nov 14, 2007 1:18 PM, Brett Cannon <[EMAIL PROTECTED]> wrote: > > On Nov 14, 2007 10:30 AM, Isaac Morland <[EMAIL PROTECTED]> wrote: > > > So I wrote a Signature class. Instances of the class represent all the > > > information present between the parentheses of a procedure definition. > > > Properties are provided to get the information out, and an expand_args > > > method > > > can be called to expand arguments into a dictionary. This expand_args > > > method > > > implements (if I've done it right) the argument conversion part of section > > > 5.3.4 of the Python Reference Manual > > > (http://docs.python.org/ref/calls.html). > > > > As Collin already pointed out, it sounds like you want PEP 362 to get > > into the stdlib. I have not made a big push to try to get my existing > > implementation into Python 2.6/3.0, but I plan to at some point. > > Every time I read PEP 362, I get lost in the details. When you get > around to working on it again, could you add a bunch of examples? > That would make it much easier to tell why we want all those objects > and attributes. > You might not need them in general. It just re-packages all the information that is found between a function object and a code object into a single location. > FWIW, Isaac's version of bind() that returns a regular str->object > dict is all I've ever needed in my own code. That's what the implementation does at the moment (if I remember correctly). I am about to bundle up the code and submit to PyPI to get feedback from folks and to just get it out there instead of languishing in the sandbox while I try to decide exactly what to do about the open issues. I will see if i can toss in some examples into the PEP. -Brett ___ 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
Re: [Python-Dev] Python Library Addition: First-class Procedure Signatures
On Nov 15, 2007 12:48 PM, Steven Bethard <[EMAIL PROTECTED]> wrote: > On Nov 14, 2007 1:18 PM, Brett Cannon <[EMAIL PROTECTED]> wrote: > > On Nov 14, 2007 10:30 AM, Isaac Morland <[EMAIL PROTECTED]> wrote: > > > So I wrote a Signature class. Instances of the class represent all the > > > information present between the parentheses of a procedure definition. > > > Properties are provided to get the information out, and an expand_args > > > method > > > can be called to expand arguments into a dictionary. This expand_args > > > method > > > implements (if I've done it right) the argument conversion part of section > > > 5.3.4 of the Python Reference Manual > > > (http://docs.python.org/ref/calls.html). > > > > As Collin already pointed out, it sounds like you want PEP 362 to get > > into the stdlib. I have not made a big push to try to get my existing > > implementation into Python 2.6/3.0, but I plan to at some point. > > Every time I read PEP 362, I get lost in the details. When you get > around to working on it again, could you add a bunch of examples? > That would make it much easier to tell why we want all those objects > and attributes. > Done. I tossed up an annotations duck typing checker in the PEP. > FWIW, Isaac's version of bind() that returns a regular str->object > dict is all I've ever needed in my own code. My implementation does that as well. It was a typo in the PEP that said bind() returned Parameter objects as values. -Brett ___ 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
