[Python-Dev] Keyword-only parameters
I'm working on adding a numeric_owner parameter to some tarfile methods (http://bugs.python.org/issue23193), In a review, Berker suggested making the parameter keyword-only. I agree that you'd likely never want to pass just "True", but that "numeric_owner=True" would be a better usage. But, I don't see a lot of keyword-only parameters being added to stdlib code. Is there some position we've taken on this? Barring someone saying "stdlib APIs shouldn't contain keyword-only params", I'm inclined to make numeric_owner keyword-only. Is there anything stopping me from making it keyword-only? Thanks. Eric. ___ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
Re: [Python-Dev] Keyword-only parameters
At least asyncio uses keyword-only intensively. On Tue, Apr 14, 2015 at 1:40 PM, Eric V. Smith wrote: > I'm working on adding a numeric_owner parameter to some tarfile methods > (http://bugs.python.org/issue23193), > > In a review, Berker suggested making the parameter keyword-only. I agree > that you'd likely never want to pass just "True", but that > "numeric_owner=True" would be a better usage. > > But, I don't see a lot of keyword-only parameters being added to stdlib > code. Is there some position we've taken on this? Barring someone saying > "stdlib APIs shouldn't contain keyword-only params", I'm inclined to > make numeric_owner keyword-only. > > Is there anything stopping me from making it keyword-only? > > Thanks. > Eric. > ___ > Python-Dev mailing list > Python-Dev@python.org > https://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: > https://mail.python.org/mailman/options/python-dev/andrew.svetlov%40gmail.com -- Thanks, Andrew Svetlov ___ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
Re: [Python-Dev] Keyword-only parameters
Lacking anything anyone else says... the use case for keyword only arguments (where they actually make the code better rather than simply being different) is rather limited. On 4/14/2015 13:40, Eric V. Smith wrote: I'm working on adding a numeric_owner parameter to some tarfile methods (http://bugs.python.org/issue23193), In a review, Berker suggested making the parameter keyword-only. I agree that you'd likely never want to pass just "True", but that "numeric_owner=True" would be a better usage. But, I don't see a lot of keyword-only parameters being added to stdlib code. Is there some position we've taken on this? Barring someone saying "stdlib APIs shouldn't contain keyword-only params", I'm inclined to make numeric_owner keyword-only. Is there anything stopping me from making it keyword-only? Thanks. Eric. ___ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/tritium-list%40sdamon.com ___ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
Re: [Python-Dev] Keyword-only parameters
On Tue, Apr 14, 2015 at 01:40:40PM -0400, Eric V. Smith wrote: > But, I don't see a lot of keyword-only parameters being added to stdlib > code. Is there some position we've taken on this? Barring someone saying > "stdlib APIs shouldn't contain keyword-only params", I'm inclined to > make numeric_owner keyword-only. I expect that's because keyword-only parameters are quite recent (3.x only) and most of the stdlib is quite old. Keyword-only feels right for this to me too. -- Steve ___ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
Re: [Python-Dev] Keyword-only parameters
On Tue, Apr 14, 2015 at 1:06 PM, Steven D'Aprano wrote: > On Tue, Apr 14, 2015 at 01:40:40PM -0400, Eric V. Smith wrote: >> But, I don't see a lot of keyword-only parameters being added to stdlib >> code. Is there some position we've taken on this? Barring someone saying >> "stdlib APIs shouldn't contain keyword-only params", I'm inclined to >> make numeric_owner keyword-only. > > I expect that's because keyword-only parameters are quite recent (3.x > only) and most of the stdlib is quite old. > > Keyword-only feels right for this to me too. +1 -- Zach ___ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
Re: [Python-Dev] Keyword-only parameters
Hello, On Tue, 14 Apr 2015 13:40:40 -0400 "Eric V. Smith" wrote: > I'm working on adding a numeric_owner parameter to some tarfile > methods (http://bugs.python.org/issue23193), > > In a review, Berker suggested making the parameter keyword-only. I > agree that you'd likely never want to pass just "True", but that > "numeric_owner=True" would be a better usage. > > But, I don't see a lot of keyword-only parameters being added to > stdlib code. Well, majority of stdlib is stable, why would somebody suddenly go and start adding some novelty to otherwise stable and consistent API? But newer parts of stdlib, e.g. asyncio, visibly overuse kw-only args. > Is there some position we've taken on this? Barring > someone saying "stdlib APIs shouldn't contain keyword-only params", > I'm inclined to make numeric_owner keyword-only. > > Is there anything stopping me from making it keyword-only? > > Thanks. > Eric. -- Best regards, Paul mailto:pmis...@gmail.com ___ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
Re: [Python-Dev] Keyword-only parameters
I personally find that keyword only arguments make for nicer APIS. It also makes subclassing easier because you are free to add new positional arguments later. Especially for boolean arguments, I think keyword only is a great API choice. On Tue, Apr 14, 2015 at 2:06 PM, Steven D'Aprano wrote: > On Tue, Apr 14, 2015 at 01:40:40PM -0400, Eric V. Smith wrote: > > > But, I don't see a lot of keyword-only parameters being added to stdlib > > code. Is there some position we've taken on this? Barring someone saying > > "stdlib APIs shouldn't contain keyword-only params", I'm inclined to > > make numeric_owner keyword-only. > > I expect that's because keyword-only parameters are quite recent (3.x > only) and most of the stdlib is quite old. > > Keyword-only feels right for this to me too. > > -- > Steve > ___ > Python-Dev mailing list > Python-Dev@python.org > https://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: > https://mail.python.org/mailman/options/python-dev/joe%40quantopian.com > ___ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
Re: [Python-Dev] Keyword-only parameters
If you’re introducing a new parameter that is a boolean, making it kw-only is generally accepted. Some people (myself included) would encourage you to do so. Besides asyncio, there are already new arguments that are kw-only in many modules, including configparser, unittest, xml.etree, xmlrpc, urllib.request, traceback, tarfile, shutil, ssl, etc. > On Apr 14, 2015, at 1:40 PM, Eric V. Smith wrote: > > I'm working on adding a numeric_owner parameter to some tarfile methods > (http://bugs.python.org/issue23193), > > In a review, Berker suggested making the parameter keyword-only. I agree > that you'd likely never want to pass just "True", but that > "numeric_owner=True" would be a better usage. > > But, I don't see a lot of keyword-only parameters being added to stdlib > code. Is there some position we've taken on this? Barring someone saying > "stdlib APIs shouldn't contain keyword-only params", I'm inclined to > make numeric_owner keyword-only. > > Is there anything stopping me from making it keyword-only? > > Thanks. > Eric. > ___ > Python-Dev mailing list > Python-Dev@python.org > https://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: > https://mail.python.org/mailman/options/python-dev/lukasz%40langa.pl ___ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
Re: [Python-Dev] Keyword-only parameters
On 04/14/2015 02:11 PM, Zachary Ware wrote: > On Tue, Apr 14, 2015 at 1:06 PM, Steven D'Aprano wrote: >> On Tue, Apr 14, 2015 at 01:40:40PM -0400, Eric V. Smith wrote: >>> But, I don't see a lot of keyword-only parameters being added to stdlib >>> code. Is there some position we've taken on this? Barring someone saying >>> "stdlib APIs shouldn't contain keyword-only params", I'm inclined to >>> make numeric_owner keyword-only. >> >> I expect that's because keyword-only parameters are quite recent (3.x >> only) and most of the stdlib is quite old. >> >> Keyword-only feels right for this to me too. > > +1 Thanks. I'll make it keyword-only. Eric. ___ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
Re: [Python-Dev] Status on PEP-431 Timezones
OK, so I realized another thing today, and that is that arithmetic
doesn't necessarily round trip.
For example, 2002-10-27 01:00 US/Eastern comes both in DST and STD.
But 2002-10-27 01:00 US/Eastern STD minus two days is 2002-10-25 01:00
US/Eastern DST
However, 2002-10-25 01:00 US/Eastern DST plus two days is 2002-10-27
01:00 US/Eastern, but it is ambiguous if you want DST or not DST.
And you can't pass in a is_dst flag to __add__, so the arithmatic must
just pick one, and the sensible one is to keep to the same DST.
That means that:
tz = get_timezone('US/Eastern')
dt = datetime(2002, 10, 27, 1, 0, tz=tz, is_dst=False)
dt2 = dt - 420 + 420
assert dt == dt2
Will fail, which will be unexpected for most people.
I think there is no way around this, but I thought I should flag for
it. This is a good reason to do all your date time arithmetic in UTC.
//Lennart
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Re: [Python-Dev] Keyword-only parameters
On 04/14, Eric V. Smith wrote: > But, I don't see a lot of keyword-only parameters being added to stdlib > code. Is there some position we've taken on this? Barring someone saying > "stdlib APIs shouldn't contain keyword-only params", I'm inclined to > make numeric_owner keyword-only. os.path and shutil make extensive use of keyword-only params. -- ~Ethan~ ___ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
Re: [Python-Dev] Keyword-only parameters
On 04/14/2015 01:40 PM, Eric V. Smith wrote:
I'm working on adding a numeric_owner parameter to some tarfile methods
(http://bugs.python.org/issue23193),
In a review, Berker suggested making the parameter keyword-only. I agree
that you'd likely never want to pass just "True", but that
"numeric_owner=True" would be a better usage.
Boolean parameters are the classic problem that keyword-only parameters
solve. It forces the caller to provide context for the parameter,
solving the mystery-meat API problem of
tarfile.extractall(".", None, True)
On 04/14/2015 01:56 PM, Paul Sokolovsky wrote:
But newer parts of stdlib, e.g. asyncio, visibly overuse kw-only args.
Overuse? asyncio? You mean "that thing Guido just wrote last year"?
The most practical definition I've heard for the word "pythonic" is
"code like Guido writes".
//arry/
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Re: [Python-Dev] Keyword-only parameters
Hello, On Tue, 14 Apr 2015 15:40:32 -0400 Larry Hastings wrote: > On 04/14/2015 01:56 PM, Paul Sokolovsky wrote: > > But newer parts of stdlib, e.g. asyncio, visibly overuse kw-only > > args. > > Overuse? asyncio? You mean "that thing Guido just wrote last > year"? The most practical definition I've heard for the word > "pythonic" is "code like Guido writes". You probably read that sentence too fast, so let's clarify it up: 1. asyncio project, previously known as "tulip" is some 2.5 years old, prooflink: https://github.com/python/asyncio/commit/0b0da72d0d23a4c582ea07dd3d2638021183750e . The fact that people still don't know it well enough (e.g. that it's full of kw-only args, or that it's so old) is sad. 2. asyncio has >1 function which accepts just couple of arguments, one of the arguments being forced as keyword-only. There can be multiple opinions of how to treat such usage of kw-only arguments, and one of the opinions can be summarized as "overuse of kw-only arguments". And to state the obvious, Python had keyword arguments for ages, and people used them all this time. The talk now is to *force* people to use keyword arguments. Done right (as supposedly asyncio tries to do, actual results may vary), it's good. But if it suddenly goes as a fashion to make kw-only args *everywhere*, that can only lead to harder to type and noisier to read code. So yes, people better err on the side of not forcing them as such, leaving choice to the actual users. > //arry/ -- Best regards, Paul mailto:pmis...@gmail.com ___ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
Re: [Python-Dev] Status on PEP-431 Timezones
On Wed, Apr 8, 2015 at 11:18 AM, Lennart Regebro wrote: > > I wrote PEP-431 two years ago, and never got around to implement it. > This year I got some renewed motivation after Berker Peksağ made an > effort of implementing it. > I'm planning to work more on this during the PyCon sprints, and also > have a BoF session or similar during the conference. For those who were not at the conference, can someone summarize the post-PyCon status of this PEP? Is Barry still the "BDFL-Delegate"? Is there an updated draft? Should this discussion move to python-ideas? ___ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
Re: [Python-Dev] Keyword-only parameters
On Tue, Apr 14, 2015 at 1:56 PM Alexander Walters wrote: > Lacking anything anyone else says... the use case for keyword only > arguments (where they actually make the code better rather than simply > being different) is rather limited. > > I disagree. For parameters not often passed or beyond 3-4 parameters being used on any API I actually prefer that we start using keyword only parameters for those. I'd say feel free to use keyword only parameters when you believe they make sense. Most of the stdlib does not do it because most of the APIs were defined in the 2.x era and maintaining compatibility with them is desirable for 2AND3 compatible code. But for new things, feel free. -gps > On 4/14/2015 13:40, Eric V. Smith wrote: > > I'm working on adding a numeric_owner parameter to some tarfile methods > > (http://bugs.python.org/issue23193), > > > > In a review, Berker suggested making the parameter keyword-only. I agree > > that you'd likely never want to pass just "True", but that > > "numeric_owner=True" would be a better usage. > > > > But, I don't see a lot of keyword-only parameters being added to stdlib > > code. Is there some position we've taken on this? Barring someone saying > > "stdlib APIs shouldn't contain keyword-only params", I'm inclined to > > make numeric_owner keyword-only. > > > > Is there anything stopping me from making it keyword-only? > > > > Thanks. > > Eric. > > ___ > > Python-Dev mailing list > > Python-Dev@python.org > > https://mail.python.org/mailman/listinfo/python-dev > > Unsubscribe: > https://mail.python.org/mailman/options/python-dev/tritium-list%40sdamon.com > > ___ > Python-Dev mailing list > Python-Dev@python.org > https://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: > https://mail.python.org/mailman/options/python-dev/greg%40krypto.org > ___ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
Re: [Python-Dev] Keyword-only parameters
Also, why do you think we added the 'lone star' syntax? :-) -- --Guido van Rossum (python.org/~guido) ___ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
Re: [Python-Dev] Status on PEP-431 Timezones
On Tue, Apr 14, 2015 at 4:52 PM, Alexander Belopolsky wrote: > For those who were not at the conference, can someone summarize the > post-PyCon status of this PEP? > > Is Barry still the "BDFL-Delegate"? Is there an updated draft? Should this > discussion move to python-ideas? There is no status change except that it will need updates, but I'm waiting with that until I know what updates are needed, and that means an implementation is needed first. //Lennart ___ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
Re: [Python-Dev] Keyword-only parameters
On 4/14/2015 2:14 PM, Guido van Rossum wrote: Also, why do you think we added the 'lone star' syntax? :-) Hint: Not because Guido is from Texas ___ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
[Python-Dev] Aprender Pythton
Quiero aprender python quiero empezar agradezco si me pueden ayudar L.I. Baldomero Pérez Martínez Enc. Proy. Informatica Fideicomiso Ingenio Atencingo 80326___ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
Re: [Python-Dev] Aprender Pythton
Hola Baldomero, Esta lista es para el desarrollo de el lenguaje Python. Para dudas sobre como aprender Python o su utilización puedes utilizar la lista en español python...@python.org o la lista en inglés python-l...@python.org Existe también la lista en inglés para pedir ayuda para iniciarse en el uso de Python tu...@python.org Saludos, Raúl On 14 Apr 2015 20:03, "Baldomero Perez martinez" < bpma...@yahoo.com.dmarc.invalid.mx> wrote: > Quiero aprender python quiero empezar agradezco si me pueden ayudar > > L.I. Baldomero Pérez Martínez > Enc. Proy. Informatica > Fideicomiso Ingenio Atencingo 80326 > > ___ > Python-Dev mailing list > Python-Dev@python.org > https://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: > https://mail.python.org/mailman/options/python-dev/raulcumplido%40gmail.com > > ___ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
Re: [Python-Dev] Aprender Pythton
Baldomero, Veo que perteneces al estado de Puebla, México, existe la lista de Python México https://mail.python.org/mailman/listinfo/python-mx, habemos varios de Puebla que te podemos apoyar. Saludos. El 14 de abril de 2015, 19:50, Baldomero Perez martinez < bpma...@yahoo.com.dmarc.invalid.mx> escribió: > Quiero aprender python quiero empezar agradezco si me pueden ayudar > > L.I. Baldomero Pérez Martínez > Enc. Proy. Informatica > Fideicomiso Ingenio Atencingo 80326 > > ___ > Python-Dev mailing list > Python-Dev@python.org > https://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: > https://mail.python.org/mailman/options/python-dev/erik.river%40gmail.com > > ___ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
Re: [Python-Dev] Aprender Pythton
I'm sorry. Please use English in the mailing list. People may not understand your chatting. 2015-04-14 20:36 GMT-04:00 Erik Rivera : > Baldomero, > > Veo que perteneces al estado de Puebla, México, existe la lista de Python > México https://mail.python.org/mailman/listinfo/python-mx, habemos varios > de Puebla que te podemos apoyar. > > Saludos. > > El 14 de abril de 2015, 19:50, Baldomero Perez martinez < > bpma...@yahoo.com.dmarc.invalid.mx> escribió: > >> Quiero aprender python quiero empezar agradezco si me pueden ayudar >> >> L.I. Baldomero Pérez Martínez >> Enc. Proy. Informatica >> Fideicomiso Ingenio Atencingo 80326 >> >> ___ >> Python-Dev mailing list >> Python-Dev@python.org >> https://mail.python.org/mailman/listinfo/python-dev >> Unsubscribe: >> https://mail.python.org/mailman/options/python-dev/erik.river%40gmail.com >> >> > > ___ > Python-Dev mailing list > Python-Dev@python.org > https://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: > https://mail.python.org/mailman/options/python-dev/andrew.svetlov%40gmail.com > > -- Thanks, Andrew Svetlov ___ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
Re: [Python-Dev] Aprender Pythton
Hi Andrew, Is someone asking where to find resources to learn Python. We have redirected him to the python lists both in english and spanish. We should have replied in English if it would have been something related to python-dev, but we have responded in Spanish as maybe the user doesn't understand English. Kind Regards, Raúl 2015-04-14 20:41 GMT-04:00 Andrew Svetlov : > I'm sorry. Please use English in the mailing list. > > People may not understand your chatting. > > 2015-04-14 20:36 GMT-04:00 Erik Rivera : > >> Baldomero, >> >> Veo que perteneces al estado de Puebla, México, existe la lista de Python >> México https://mail.python.org/mailman/listinfo/python-mx, habemos >> varios de Puebla que te podemos apoyar. >> >> Saludos. >> >> El 14 de abril de 2015, 19:50, Baldomero Perez martinez < >> bpma...@yahoo.com.dmarc.invalid.mx> escribió: >> >>> Quiero aprender python quiero empezar agradezco si me pueden ayudar >>> >>> L.I. Baldomero Pérez Martínez >>> Enc. Proy. Informatica >>> Fideicomiso Ingenio Atencingo 80326 >>> >>> ___ >>> Python-Dev mailing list >>> Python-Dev@python.org >>> https://mail.python.org/mailman/listinfo/python-dev >>> Unsubscribe: >>> https://mail.python.org/mailman/options/python-dev/erik.river%40gmail.com >>> >>> >> >> ___ >> Python-Dev mailing list >> Python-Dev@python.org >> https://mail.python.org/mailman/listinfo/python-dev >> Unsubscribe: >> https://mail.python.org/mailman/options/python-dev/andrew.svetlov%40gmail.com >> >> > > > -- > Thanks, > Andrew Svetlov > > ___ > Python-Dev mailing list > Python-Dev@python.org > https://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: > https://mail.python.org/mailman/options/python-dev/raulcumplido%40gmail.com > > ___ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
Re: [Python-Dev] Aprender Pythton
Python-dev is for development OF Python, not for development WITH Python or Python LEARNING, BTW. On Tue, Apr 14, 2015 at 8:46 PM, Raúl Cumplido wrote: > Hi Andrew, > > Is someone asking where to find resources to learn Python. We have > redirected him to the python lists both in english and spanish. > > We should have replied in English if it would have been something related > to python-dev, but we have responded in Spanish as maybe the user doesn't > understand English. > > Kind Regards, > Raúl > > 2015-04-14 20:41 GMT-04:00 Andrew Svetlov : > >> I'm sorry. Please use English in the mailing list. >> >> People may not understand your chatting. >> >> 2015-04-14 20:36 GMT-04:00 Erik Rivera : >> >>> Baldomero, >>> >>> Veo que perteneces al estado de Puebla, México, existe la lista de >>> Python México https://mail.python.org/mailman/listinfo/python-mx, >>> habemos varios de Puebla que te podemos apoyar. >>> >>> Saludos. >>> >>> El 14 de abril de 2015, 19:50, Baldomero Perez martinez < >>> bpma...@yahoo.com.dmarc.invalid.mx> escribió: >>> Quiero aprender python quiero empezar agradezco si me pueden ayudar L.I. Baldomero Pérez Martínez Enc. Proy. Informatica Fideicomiso Ingenio Atencingo 80326 ___ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/erik.river%40gmail.com >>> >>> ___ >>> Python-Dev mailing list >>> Python-Dev@python.org >>> https://mail.python.org/mailman/listinfo/python-dev >>> Unsubscribe: >>> https://mail.python.org/mailman/options/python-dev/andrew.svetlov%40gmail.com >>> >>> >> >> >> -- >> Thanks, >> Andrew Svetlov >> >> ___ >> Python-Dev mailing list >> Python-Dev@python.org >> https://mail.python.org/mailman/listinfo/python-dev >> Unsubscribe: >> https://mail.python.org/mailman/options/python-dev/raulcumplido%40gmail.com >> >> > -- Thanks, Andrew Svetlov ___ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
Re: [Python-Dev] Aprender Pythton
On Tue, Apr 14, 2015 at 7:54 PM, Andrew Svetlov wrote: > Python-dev is for development OF Python, not for development WITH Python > or Python LEARNING, BTW. > > On Tue, Apr 14, 2015 at 8:46 PM, Raúl Cumplido > wrote: > >> Hi Andrew, >> >> Is someone asking where to find resources to learn Python. We have >> redirected him to the python lists both in english and spanish. >> >> We should have replied in English if it would have been something related >> to python-dev, but we have responded in Spanish as maybe the user doesn't >> understand English. >> >> Kind Regards, >> Raúl >> >> 2015-04-14 20:41 GMT-04:00 Andrew Svetlov : >> >>> I'm sorry. Please use English in the mailing list. >>> >>> People may not understand your chatting. >>> >>> 2015-04-14 20:36 GMT-04:00 Erik Rivera : >>> Baldomero, Veo que perteneces al estado de Puebla, México, existe la lista de Python México https://mail.python.org/mailman/listinfo/python-mx, habemos varios de Puebla que te podemos apoyar. Saludos. El 14 de abril de 2015, 19:50, Baldomero Perez martinez < bpma...@yahoo.com.dmarc.invalid.mx> escribió: > Quiero aprender python quiero empezar agradezco si me pueden ayudar > > L.I. Baldomero Pérez Martínez > Enc. Proy. Informatica > Fideicomiso Ingenio Atencingo 80326 > > ___ > Python-Dev mailing list > Python-Dev@python.org > https://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: > https://mail.python.org/mailman/options/python-dev/erik.river%40gmail.com > > ___ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/andrew.svetlov%40gmail.com >>> >>> >>> -- >>> Thanks, >>> Andrew Svetlov >>> >>> ___ >>> Python-Dev mailing list >>> Python-Dev@python.org >>> https://mail.python.org/mailman/listinfo/python-dev >>> Unsubscribe: >>> https://mail.python.org/mailman/options/python-dev/raulcumplido%40gmail.com >>> >>> >> > > > -- > Thanks, > Andrew Svetlov > > ___ > Python-Dev mailing list > Python-Dev@python.org > https://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: > https://mail.python.org/mailman/options/python-dev/graffatcolmingov%40gmail.com > > Andrew if you translate the text that was sent to Baldomero, you'll see that's exactly what they said. Please don't be so rude (or lazy) to people helping someone learn Python, regardless of whether they mistakenly posted to the wrong list. ___ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
Re: [Python-Dev] Aprender Pythton
Ok, sorry. On Tue, Apr 14, 2015 at 8:59 PM, Ian Cordasco wrote: > > > On Tue, Apr 14, 2015 at 7:54 PM, Andrew Svetlov > wrote: > >> Python-dev is for development OF Python, not for development WITH Python >> or Python LEARNING, BTW. >> >> On Tue, Apr 14, 2015 at 8:46 PM, Raúl Cumplido >> wrote: >> >>> Hi Andrew, >>> >>> Is someone asking where to find resources to learn Python. We have >>> redirected him to the python lists both in english and spanish. >>> >>> We should have replied in English if it would have been something >>> related to python-dev, but we have responded in Spanish as maybe the user >>> doesn't understand English. >>> >>> Kind Regards, >>> Raúl >>> >>> 2015-04-14 20:41 GMT-04:00 Andrew Svetlov : >>> I'm sorry. Please use English in the mailing list. People may not understand your chatting. 2015-04-14 20:36 GMT-04:00 Erik Rivera : > Baldomero, > > Veo que perteneces al estado de Puebla, México, existe la lista de > Python México https://mail.python.org/mailman/listinfo/python-mx, > habemos varios de Puebla que te podemos apoyar. > > Saludos. > > El 14 de abril de 2015, 19:50, Baldomero Perez martinez < > bpma...@yahoo.com.dmarc.invalid.mx> escribió: > >> Quiero aprender python quiero empezar agradezco si me pueden ayudar >> >> L.I. Baldomero Pérez Martínez >> Enc. Proy. Informatica >> Fideicomiso Ingenio Atencingo 80326 >> >> ___ >> Python-Dev mailing list >> Python-Dev@python.org >> https://mail.python.org/mailman/listinfo/python-dev >> Unsubscribe: >> https://mail.python.org/mailman/options/python-dev/erik.river%40gmail.com >> >> > > ___ > Python-Dev mailing list > Python-Dev@python.org > https://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: > https://mail.python.org/mailman/options/python-dev/andrew.svetlov%40gmail.com > > -- Thanks, Andrew Svetlov ___ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/raulcumplido%40gmail.com >>> >> >> >> -- >> Thanks, >> Andrew Svetlov >> >> ___ >> Python-Dev mailing list >> Python-Dev@python.org >> https://mail.python.org/mailman/listinfo/python-dev >> Unsubscribe: >> https://mail.python.org/mailman/options/python-dev/graffatcolmingov%40gmail.com >> >> > Andrew if you translate the text that was sent to Baldomero, you'll see > that's exactly what they said. Please don't be so rude (or lazy) to people > helping someone learn Python, regardless of whether they mistakenly posted > to the wrong list. > -- Thanks, Andrew Svetlov ___ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
Re: [Python-Dev] Status on PEP-431 Timezones
On 14 April 2015 at 21:04, Lennart Regebro wrote:
> OK, so I realized another thing today, and that is that arithmetic
> doesn't necessarily round trip.
>
> For example, 2002-10-27 01:00 US/Eastern comes both in DST and STD.
>
> But 2002-10-27 01:00 US/Eastern STD minus two days is 2002-10-25 01:00
> US/Eastern DST
> However, 2002-10-25 01:00 US/Eastern DST plus two days is 2002-10-27
> 01:00 US/Eastern, but it is ambiguous if you want DST or not DST.
> And you can't pass in a is_dst flag to __add__, so the arithmatic must
> just pick one, and the sensible one is to keep to the same DST.
>>> import pytz
>>> from datetime import datetime, timedelta
>>> tz = pytz.timezone('US/Eastern')
>>> dt = tz.localize(datetime(2002, 10, 27, 1, 0), is_dst=False)
>>> dt2 = tz.normalize(dt - timedelta(days=2) + timedelta(days=2))
>>> dt == dt2
True
>>>
>>> tz.normalize(dt - timedelta(days=2))
datetime.datetime(2002, 10, 25, 2, 0, tzinfo=)
>>> tz.normalize(tz.normalize(dt - timedelta(days=2)) + timedelta(days=2))
datetime.datetime(2002, 10, 27, 1, 0, tzinfo=)
2002-10-27 01:00 US/Eastern is_dst=0 is after the DST transition
(EST). Subtracting 48 hours from it crosses the DST boundary and
should give you 2002-10-27 02:00 US/Eastern is_dst=1, prior to the DST
transition (EDT). Adding 48 hours again goes past 2002-10-27 01:00
EDT, crosses the DST boundary, and gives you back 2002-10-27 01:00
EST.
--
Stuart Bishop
http://www.stuartbishop.net/
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