Mailman 3 April 2015 - Python-Dev

Aprender Pythton
by Baldomero Perez martinez 15 Apr '15

15 Apr '15

Quiero aprender python quiero empezar agradezco si me pueden ayudar L.I. Baldomero Pérez Martínez Enc. Proy. Informatica Fideicomiso Ingenio Atencingo 80326

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Keyword-only parameters
by Eric V. Smith 14 Apr '15

14 Apr '15

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.

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Re: [Python-Dev] [PSF-Members] PyCon Survivor's breakfast
by Steve Holden 12 Apr '15

12 Apr '15

Indeed. I believe that the date is on the Eventbrite page, but sorry for omitting obviously necessary information. It's tomorrow. Hope to see you there. S On Apr 12, 2015, at 4:49 PM, Stephane Wirtel <stephane(a)wirtel.be> wrote: > 7h30 morning ? Tomorrow > > On 12 avr. 2015, at 4:13 PM, Steve Holden <steve(a)holdenweb.com> wrote: > >> Hi everybody, >> >> This year sees the third PyCon Survivors' Breakfast at Suite 701, a restaurant attached to the Place d'Armes hotel just up the road from the Palais de Congres (map on Eventbrite page). >> >> All Python developers, PSF members and PyCon delegates are cordially invited to attend. The event starts at 7:30 but you can roll in whenever you feel like breakfast (I start early so that those who wish to start sprinting promptly can still join us). >> >> The places cost about $45 a head (I've been asked about costs, I don't really know why) and you have a choice of prices, including free. I don't want anyone to feel that inability to pay need stop them coming along to join us. Last year's event was a relaxing change from the Palais de Congres. I hope I see you there. >> >> Sign up at http://bit.ly/PyConSurvivor2015. >> >> Numbers are limited, but last year there was a place for everyone who wanted to attend. If you are at PyCon, or know someone who is, please let them know that this invitation extends to everyone who attended. >> >> regards >> Steve >> -- >> Steve Holden steve(a)holdenweb.com / +1 571 484 6266 / +44 113 320 2335 / @holdenweb >> >> >> >> >> _______________________________________________ >> PSF-Members mailing list >> PSF-Members(a)python.org >> https://mail.python.org/mailman/listinfo/psf-members >> PSF home page (http://www.python.org/psf/) >> PSF membership FAQ (http://www.python.org/psf/membership/) >> PSF members' wiki (http://wiki.python.org/psf/) -- Steve Holden steve(a)holdenweb.com / +1 571 484 6266 / +44 113 320 2335 / @holdenweb

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PyCon Survivor's breakfast
by Steve Holden 12 Apr '15

12 Apr '15

Hi everybody, This year sees the third PyCon Survivors' Breakfast at Suite 701, a restaurant attached to the Place d'Armes hotel just up the road from the Palais de Congres (map on Eventbrite page). All Python developers, PSF members and PyCon delegates are cordially invited to attend. The event starts at 7:30 but you can roll in whenever you feel like breakfast (I start early so that those who wish to start sprinting promptly can still join us). The places cost about $45 a head (I've been asked about costs, I don't really know why) and you have a choice of prices, including free. I don't want anyone to feel that inability to pay need stop them coming along to join us. Last year's event was a relaxing change from the Palais de Congres. I hope I see you there. Sign up at http://bit.ly/PyConSurvivor2015. Numbers are limited, but last year there was a place for everyone who wanted to attend. If you are at PyCon, or know someone who is, please let them know that this invitation extends to everyone who attended. regards Steve -- Steve Holden steve(a)holdenweb.com / +1 571 484 6266 / +44 113 320 2335 / @holdenweb

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Re: [Python-Dev] Status on PEP-431 Timezones
by Isaac Schwabacher 11 Apr '15

11 Apr '15

On 15-04-09, Alexander Belopolsky wrote: > > On Thu, Apr 9, 2015 at 11:59 AM, Isaac Schwabacher <ischwabacher@wisc.edu(javascript:main.compose()> wrote: > > > > Storing isdst in the datetime object would allow utcoffset(dt) to distinguish between 1:30AM before clock change and 1:30AM after. Where do you propose to store the offset? > > > > I propose to add an offset field to datetime.datetime. It should be set precisely when the tz field is set, and it should contain either a timedelta or an integer number of (possibly fractional) seconds, depending on what color the bikeshed gets painted. This is, IIUC, precisely where Lennart is proposing to store the is_dst flag. > > Can you describe a situation where having isdst flag is not sufficient? > > Note that in many applications you want to find the appropriate offset knowing only local time and location, so requiring users to supply the offset defeats the purpose of the time zone database. In many applications, the isdst flag can be hidden from the user. For example, a scheduling application can pretend that a repeated hour does not exist and always assume that 01:30 AM is the first 01:30 AM. (In many business applications, it is a good idea anyways.) Alternatively, a user attempting to schedule an event at an ambiguous time can be presented with a warning and a request to pick one of two possible times. This would be a much friendlier interface than the one always requiring the use to specify the UTC offset. I'm suggesting an internal representation, not a user interface. The only user-facing consequence of this internal representation would be exposing the offset to datetime.replace() and as a field on the object. All of the other interfaces that convert naive datetimes into aware datetimes would still use the is_dst flag as specified in the PEP. The intention is to make it easy to implement arithmetic and things like relative timedeltas. But looking at datetime.h, which seems to be willing to sacrifice conceptual simplicity in order to pack a datetime into as few bytes in memory as possible, it seems like whatever made that a good idea makes this a bad one. :/ > > if someone passed you datetime(2013, 11, 3, 1, 30) without a time zone. astimezone assumes that the input naive time is UTC, which is not the case here. > > No, it does not. Please read the documentation: "self must be aware (self.tzinfo must not be None, and self.utcoffset() must not return None)." Whoops, you're right. But that's even worse-- it doesn't give you a way to convert a naive datetime at all. Currently the only way from "2013-11-03 01:30:00" to "2013-11-03 01:30:00-0500 America/Chicago" is still datetime.replace(). ijs

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Summary of Python tracker Issues
by Python tracker 10 Apr '15

10 Apr '15

ACTIVITY SUMMARY (2015-04-03 - 2015-04-10) Python tracker at http://bugs.python.org/ To view or respond to any of the issues listed below, click on the issue. Do NOT respond to this message. Issues counts and deltas: open 4823 (-15) closed 30844 (+62) total 35667 (+47) Open issues with patches: 2238 Issues opened (38) ================== #16840: Tkinter doesn't support large integers http://bugs.python.org/issue16840 reopened by haypo #21859: Add Python implementation of FileIO http://bugs.python.org/issue21859 reopened by serhiy.storchaka #23860: Failure to check return value from lseek() in Modules/mmapmodu http://bugs.python.org/issue23860 opened by dogbert2 #23861: Make stdprinter use DebugOutputString when no stdout/stderr av http://bugs.python.org/issue23861 opened by steve.dower #23863: Fix EINTR Socket Module issues in 2.7 http://bugs.python.org/issue23863 opened by mcjeff #23864: issubclass without registration only works for "one-trick pony http://bugs.python.org/issue23864 opened by mjpieters #23865: Fix possible leaks in close methods http://bugs.python.org/issue23865 opened by serhiy.storchaka #23867: Argument Clinic: inline parsing code for 1-argument functions http://bugs.python.org/issue23867 opened by serhiy.storchaka #23868: Uninitialized objects are tracked by the garbage collector http://bugs.python.org/issue23868 opened by h.venev #23869: Initialization is being done in PyType_GenericAlloc http://bugs.python.org/issue23869 opened by h.venev #23870: pprint collections classes http://bugs.python.org/issue23870 opened by serhiy.storchaka #23874: Encrypted MSI fails to install with code 2755 http://bugs.python.org/issue23874 opened by jason.coombs #23876: Fix mkdir() call for Watcom compilers on UNIX-like platforms http://bugs.python.org/issue23876 opened by Jeffrey.Armstrong #23878: Missing sanity checks for various C library function calls... http://bugs.python.org/issue23878 opened by dogbert2 #23880: Tkinter: getint and getdouble should support Tcl_Obj http://bugs.python.org/issue23880 opened by serhiy.storchaka #23882: unittest discovery and namespaced packages http://bugs.python.org/issue23882 opened by Florian.Apolloner #23883: __all__ lists are incomplete http://bugs.python.org/issue23883 opened by serhiy.storchaka #23885: urllib.quote horribly mishandles unicode as second parameter http://bugs.python.org/issue23885 opened by koriakin #23886: faulthandler_user should use _PyThreadState_Current http://bugs.python.org/issue23886 opened by Albert.Zeyer #23887: HTTPError doesn't have a good "repr" representation http://bugs.python.org/issue23887 opened by facundobatista #23888: Fixing fractional expiry time bug in cookiejar http://bugs.python.org/issue23888 opened by ssh #23889: Speedup inspect.Signature.bind http://bugs.python.org/issue23889 opened by yselivanov #23890: assertRaises increases reference counter http://bugs.python.org/issue23890 opened by Vjacheslav.Fyodorov #23891: Tutorial doesn't mention either pip or virtualenv http://bugs.python.org/issue23891 opened by akuchling #23892: Introduce sys.implementation.opt_levels http://bugs.python.org/issue23892 opened by brett.cannon #23893: Forward-port future_builtins http://bugs.python.org/issue23893 opened by brett.cannon #23894: lib2to3 doesn't recognize rb'...' as a raw byte string in Pyth http://bugs.python.org/issue23894 opened by eli.bendersky #23895: PATCH: python socket module fails to build on Solaris when -zi http://bugs.python.org/issue23895 opened by andy_js #23896: lib2to3 doesn't provide a grammar where exec is a function http://bugs.python.org/issue23896 opened by eli.bendersky #23897: Update Python 3 extension module porting guide http://bugs.python.org/issue23897 opened by ncoghlan #23898: inspect() changes in Python3.4 are not compatible with objects http://bugs.python.org/issue23898 opened by zzzeek #23899: HTTP regression in distutils uploads to chishop http://bugs.python.org/issue23899 opened by jason.coombs #23900: Add a default docstring to Enum subclasses http://bugs.python.org/issue23900 opened by ncoghlan #23901: Force console stdout to use UTF8 on Windows http://bugs.python.org/issue23901 opened by paul.moore #23902: let exception react to being raised or the setting of magic pr http://bugs.python.org/issue23902 opened by abathur #23903: Generate PC/python3.def by scraping headers http://bugs.python.org/issue23903 opened by zach.ware #23904: pathlib.PurePath does not accept bytes components http://bugs.python.org/issue23904 opened by bru #23906: poplib maxline behaviour may be wrong http://bugs.python.org/issue23906 opened by gnarvaja Most recent 15 issues with no replies (15) ========================================== #23906: poplib maxline behaviour may be wrong http://bugs.python.org/issue23906 #23904: pathlib.PurePath does not accept bytes components http://bugs.python.org/issue23904 #23903: Generate PC/python3.def by scraping headers http://bugs.python.org/issue23903 #23900: Add a default docstring to Enum subclasses http://bugs.python.org/issue23900 #23899: HTTP regression in distutils uploads to chishop http://bugs.python.org/issue23899 #23897: Update Python 3 extension module porting guide http://bugs.python.org/issue23897 #23896: lib2to3 doesn't provide a grammar where exec is a function http://bugs.python.org/issue23896 #23895: PATCH: python socket module fails to build on Solaris when -zi http://bugs.python.org/issue23895 #23894: lib2to3 doesn't recognize rb'...' as a raw byte string in Pyth http://bugs.python.org/issue23894 #23892: Introduce sys.implementation.opt_levels http://bugs.python.org/issue23892 #23891: Tutorial doesn't mention either pip or virtualenv http://bugs.python.org/issue23891 #23889: Speedup inspect.Signature.bind http://bugs.python.org/issue23889 #23888: Fixing fractional expiry time bug in cookiejar http://bugs.python.org/issue23888 #23886: faulthandler_user should use _PyThreadState_Current http://bugs.python.org/issue23886 #23876: Fix mkdir() call for Watcom compilers on UNIX-like platforms http://bugs.python.org/issue23876 Most recent 15 issues waiting for review (15) ============================================= #23903: Generate PC/python3.def by scraping headers http://bugs.python.org/issue23903 #23898: inspect() changes in Python3.4 are not compatible with objects http://bugs.python.org/issue23898 #23895: PATCH: python socket module fails to build on Solaris when -zi http://bugs.python.org/issue23895 #23893: Forward-port future_builtins http://bugs.python.org/issue23893 #23888: Fixing fractional expiry time bug in cookiejar http://bugs.python.org/issue23888 #23887: HTTPError doesn't have a good "repr" representation http://bugs.python.org/issue23887 #23880: Tkinter: getint and getdouble should support Tcl_Obj http://bugs.python.org/issue23880 #23878: Missing sanity checks for various C library function calls... http://bugs.python.org/issue23878 #23876: Fix mkdir() call for Watcom compilers on UNIX-like platforms http://bugs.python.org/issue23876 #23870: pprint collections classes http://bugs.python.org/issue23870 #23867: Argument Clinic: inline parsing code for 1-argument functions http://bugs.python.org/issue23867 #23865: Fix possible leaks in close methods http://bugs.python.org/issue23865 #23863: Fix EINTR Socket Module issues in 2.7 http://bugs.python.org/issue23863 #23860: Failure to check return value from lseek() in Modules/mmapmodu http://bugs.python.org/issue23860 #23857: Make default HTTPS certificate verification setting configurab http://bugs.python.org/issue23857 Top 10 most discussed issues (10) ================================= #23857: Make default HTTPS certificate verification setting configurab http://bugs.python.org/issue23857 28 msgs #23496: Steps for Android Native Build of Python 3.4.2 http://bugs.python.org/issue23496 27 msgs #23863: Fix EINTR Socket Module issues in 2.7 http://bugs.python.org/issue23863 12 msgs #15443: datetime module has no support for nanoseconds http://bugs.python.org/issue15443 8 msgs #21859: Add Python implementation of FileIO http://bugs.python.org/issue21859 8 msgs #23893: Forward-port future_builtins http://bugs.python.org/issue23893 8 msgs #23852: Wrong computation of max_fd on OpenBSD http://bugs.python.org/issue23852 7 msgs #23898: inspect() changes in Python3.4 are not compatible with objects http://bugs.python.org/issue23898 7 msgs #23883: __all__ lists are incomplete http://bugs.python.org/issue23883 5 msgs #6818: remove/delete method for zipfile/tarfile objects http://bugs.python.org/issue6818 4 msgs Issues closed (56) ================== #2174: xml.sax.xmlreader does not support the InputSource protocol http://bugs.python.org/issue2174 closed by fdrake #2276: distutils out-of-date for runtime_library_dirs flag on OS X http://bugs.python.org/issue2276 closed by r.david.murray #3566: httplib persistent connections violate MUST in RFC2616 sec 8.1 http://bugs.python.org/issue3566 closed by r.david.murray #6650: sre_parse contains a confusing generic error message http://bugs.python.org/issue6650 closed by serhiy.storchaka #7511: msvc9compiler.py: ValueError when trying to compile with VC Ex http://bugs.python.org/issue7511 closed by zach.ware #8841: getopt errors should be specialized http://bugs.python.org/issue8841 closed by r.david.murray #9248: multiprocessing.pool: Proposal: "waitforslot" http://bugs.python.org/issue9248 closed by r.david.murray #10590: Parameter type error for xml.sax.parseString(string, ...) http://bugs.python.org/issue10590 closed by serhiy.storchaka #10838: subprocess __all__ is incomplete http://bugs.python.org/issue10838 closed by gregory.p.smith #12082: Python/import.c still references fstat even with DONT_HAVE_FST http://bugs.python.org/issue12082 closed by r.david.murray #13238: Add shell command helpers to subprocess module http://bugs.python.org/issue13238 closed by r.david.murray #14812: Change file associations to not be a default installer feature http://bugs.python.org/issue14812 closed by r.david.murray #15011: Change Scripts to bin on Windows http://bugs.python.org/issue15011 closed by r.david.murray #15133: tkinter.BooleanVar.get() behavior and docstring disagree http://bugs.python.org/issue15133 closed by serhiy.storchaka #15582: Enhance inspect.getdoc to follow inheritance chains http://bugs.python.org/issue15582 closed by serhiy.storchaka #18544: subprocess.Popen support for redirection of arbitrary file des http://bugs.python.org/issue18544 closed by r.david.murray #18965: 2to3 can produce illegal bytes literals http://bugs.python.org/issue18965 closed by serhiy.storchaka #19247: Describe surrogateescape algorithm in the Library Reference http://bugs.python.org/issue19247 closed by ncoghlan #19738: pytime.c loses precision under Windows http://bugs.python.org/issue19738 closed by haypo #20611: socket.create_connection() doesn't handle EINTR properly http://bugs.python.org/issue20611 closed by gregory.p.smith #20660: Starting a second multiprocessing.Manager causes INCREF on all http://bugs.python.org/issue20660 closed by r.david.murray #22144: ellipsis needs better display in lexer documentation http://bugs.python.org/issue22144 closed by r.david.murray #22649: Use _PyUnicodeWriter in case_operation() http://bugs.python.org/issue22649 closed by haypo #22721: pprint output for sets and dicts is not stable http://bugs.python.org/issue22721 closed by serhiy.storchaka #23021: Get rid of references to PyString in Modules/ http://bugs.python.org/issue23021 closed by berker.peksag #23025: ssl.RAND_bytes docs should mention os.urandom http://bugs.python.org/issue23025 closed by berker.peksag #23027: test_warnings fails with -Werror http://bugs.python.org/issue23027 closed by berker.peksag #23062: test_argparse --version test cases http://bugs.python.org/issue23062 closed by berker.peksag #23199: libpython27.a in amd64 release is 32-bit http://bugs.python.org/issue23199 closed by zach.ware #23338: PyErr_Format in ctypes uses invalid parameter http://bugs.python.org/issue23338 closed by serhiy.storchaka #23400: Inconsistent behaviour of multiprocessing.Queue() if sem_open http://bugs.python.org/issue23400 closed by berker.peksag #23411: Update urllib.parse.__all__ http://bugs.python.org/issue23411 closed by serhiy.storchaka #23459: Linux: expose the new execveat() syscall http://bugs.python.org/issue23459 closed by haypo #23492: Argument Clinic: improve generated parser for 1-argument funct http://bugs.python.org/issue23492 closed by serhiy.storchaka #23500: Argument Clinic: multiple macro definition http://bugs.python.org/issue23500 closed by larry #23501: Argument Clinic: generate code into separate files by default http://bugs.python.org/issue23501 closed by serhiy.storchaka #23570: Change "with subprocess.Popen():" (context manager) to ignore http://bugs.python.org/issue23570 closed by haypo #23772: pymonotonic() gone backward on "AMD64 Debian root 3.x" buildbo http://bugs.python.org/issue23772 closed by haypo #23799: Join started threads in tests http://bugs.python.org/issue23799 closed by serhiy.storchaka #23807: Improved test coverage for calendar.py command line http://bugs.python.org/issue23807 closed by Thana Annis #23825: test_idle fails under -OO http://bugs.python.org/issue23825 closed by serhiy.storchaka #23841: py34 OrderedDict is using weakref for root reference http://bugs.python.org/issue23841 closed by rhettinger #23849: Leaks in test_deque http://bugs.python.org/issue23849 closed by rhettinger #23853: PEP 475: handle EINTR in the ssl module http://bugs.python.org/issue23853 closed by haypo #23856: build.bat -e shouldn't also build http://bugs.python.org/issue23856 closed by tim.golden #23862: subprocess popen arguments using double quotes http://bugs.python.org/issue23862 closed by paul.moore #23866: array module broken http://bugs.python.org/issue23866 closed by serhiy.storchaka #23871: turning itertools.{repeat,count} into indexable iterables http://bugs.python.org/issue23871 closed by r.david.murray #23872: Typo in response in smtpd http://bugs.python.org/issue23872 closed by python-dev #23873: Removal of dead code in smtpd http://bugs.python.org/issue23873 closed by python-dev #23875: Incorrect argument parsing in _ssl http://bugs.python.org/issue23875 closed by python-dev #23877: Build fails when threads are disabled during configure step http://bugs.python.org/issue23877 closed by python-dev #23879: asyncio: SelectorEventLoop.sock_connect() must not retry conne http://bugs.python.org/issue23879 closed by haypo #23881: test_urllib2net: issues with ftp://gatekeeper.research.compaq. http://bugs.python.org/issue23881 closed by haypo #23884: New DateType for argparse (like FileType but for dates) http://bugs.python.org/issue23884 closed by petedmarsh #23905: Python here making CPU go to 100% http://bugs.python.org/issue23905 closed by r.david.murray

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Re: [Python-Dev] Status on PEP-431 Timezones
by Isaac Schwabacher 09 Apr '15

09 Apr '15

On 15-04-09, Alexander Belopolsky wrote: > > On Thu, Apr 9, 2015 at 3:07 PM, Isaac Schwabacher <ischwabacher@wisc.edu(javascript:main.compose()> wrote: > > > > No, it does not. Please read the documentation: "self must be aware (self.tzinfo must not be None, and self.utcoffset() must not return None)." > > > > Whoops, you're right. But that's even worse-- it doesn't give you a way to convert a naive datetime at all. Currently the only way from "2013-11-03 01:30:00" to "2013-11-03 01:30:00-0500 America/Chicago" is still datetime.replace(). > > > Well, you are right, but at least we do have a localtime utility hidden in the email package: > > > >>> from datetime import * > >>> from email.utils import localtime > >>> print(localtime(datetime.now())) > 2015-04-09 15:19:12.840000-04:00 > > > You can read <http://bugs.python.org/issue9527> for the reasons it did not make into datetime. But that's restricted to the system time zone. Nothing good ever comes from the system time zone... ijs

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Re: [Python-Dev] Status on PEP-431 Timezones
by Isaac Schwabacher 09 Apr '15

09 Apr '15

On 15-04-09, Alexander Belopolsky wrote: > > On Thu, Apr 9, 2015 at 3:39 PM, Isaac Schwabacher <ischwabacher@wisc.edu(javascript:main.compose()> wrote: > > > > Well, you are right, but at least we do have a localtime utility hidden in the email package: > > > > > > >>> from datetime import * > > > >>> from email.utils import localtime > > > >>> print(localtime(datetime.now())) > > > 2015-04-09 15:19:12.840000-04:00 > > > > > > You can read <http://bugs.python.org/issue9527> for the reasons it did not make into datetime. > > > > But that's restricted to the system time zone. Nothing good ever comes from the system time zone... > > Let's solve one problem at a time. You cannot have a complete TZ support without supporting the local timezone. The advantage of starting with the local timezone is that most systems have a semi-standard interface to obtain local zone name and offset for any UTC time. To support multiple zones, one would > need to bundle an external library which opens a lot of questions that are orthogonal to the issue at hand: > how to deal with ambiguous local times in the presence of DST or other political time shifts? PEP 431 proposes to import zoneinfo into the stdlib, so there will be a standard way to get this information. That's kind of the whole point. But there's really no good cross-platform way to get the name of the system time zone. tzlocal figures out what it is for certain classes of systems for which it's possible, and is also being proposed for stdlib inclusion in the PEP. > email.utils.localtime solves this problem in the same way as POSIX mktime does: by introducing an optional isdst flag. The main objection to this interface was that in most use cases the programmer has no intelligent way to set this flag to anything other than -1. > > An alternative solution would be to have localtime(dt) (or astimezone(dt)) return a list of aware local times that in most cases will contain only one element, but may contain 0 or 2 when dt falls on a switchover. This functionality should probably be exposed (in ruby it's TZInfo::TimeZone#periods_for_local, where TZInfo is an external package; I don't think it's easily available in pytz), but if it's the default way to do a conversion, I suspect that it's more likely to just lead to poor error reporting. ijs

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ctypes module
by Cristi Fati 09 Apr '15

09 Apr '15

Hi all, Not sure whether you got this question, or this is the right distribution list: Intel has deprecated Itanium architecture, and Windows also deprecated its versions(currently 2003 and 2008) that run on IA64. However Python (2.7.3) is compilable on Windows IA64, but ctypes module (1.1.0) which is now part of Python is not (the source files have been removed). What was the reason for its disablement? I am asking because an older version of ctypes (1.0.2) which came as a separate extension module (i used to compile it with Python 2.4.5) was available for WinIA64; i found (and fixed) a nasty buffer overrun in it. Regards, Cristi Fati.

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Re: [Python-Dev] Status on PEP-431 Timezones
by Isaac Schwabacher 09 Apr '15

09 Apr '15

On 15-04-09, Alexander Belopolsky wrote: > > On Thu, Apr 9, 2015 at 11:59 AM, Isaac Schwabacher <ischwabacher@wisc.edu(javascript:main.compose()> wrote: > > > I just looked through the datetime documentation, and it looks like the currently blessed way of creating an aware datetime from a naive local datetime and a tzinfo is datetime.replace, which is too low level to handle the job. > > Not quite. That's how you would create a UTC datetime, but from there you can get to your local timezone by calling astimezone() with no arguments: > > >>> print(datetime.now(timezone.utc).astimezone()) > 2015-04-09 12:16:58.576272-04:00 All of the datetimes in this example are time zone aware; I meant if someone passed you datetime(2013, 11, 3, 1, 30) without a time zone. astimezone assumes that the input naive time is UTC, which is not the case here. ijs

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