[issue16810] inconsistency in weekday
New submission from Glenn Linderman: Docs say: date.timetuple() Return a time.struct_time such as returned by time.localtime(). The hours, minutes and seconds are 0, and the DST flag is -1. d.timetuple() is equivalent to time.struct_time((d.year, d.month, d.day, 0, 0, 0, d.weekday(), yday, -1)), where yday = d.toordinal() - date(d.year, 1, 1).toordinal() + 1 is the day number within the current year starting with 1 for January 1st. However, timetuple's 7th element has a range of 0-6 where 0 is Sunday, and d.weekday has a range of 0-6 where 0 is Monday. So the claim of equivalence is false. "d.weekday()" in the above could be replaced by "( d.weekday() + 1 ) % 7" I guess datetime consistently uses 0==Monday, and weeks starting on Monday, except for the timetuple (which probably has compatibility constraints which force it to return a different value, which I consider to be more correct). ---------- assignee: docs@python components: Documentation messages: 178477 nosy: docs@python, v+python priority: normal severity: normal status: open title: inconsistency in weekday versions: Python 3.3 _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue16810> _______________________________________
Serhiy Storchaka added the comment: I don't see a difference. $ ./python -c 'import time; print(time.localtime())' time.struct_time(tm_year=2012, tm_mon=12, tm_mday=29, tm_hour=19, tm_min=36, tm_sec=35, tm_wday=5, tm_yday=364, tm_isdst=0) $ ./python -c 'import datetime; print(datetime.date.today().timetuple())' time.struct_time(tm_year=2012, tm_mon=12, tm_mday=29, tm_hour=0, tm_min=0, tm_sec=0, tm_wday=5, tm_yday=364, tm_isdst=-1) Can you please provide a full code which demonstrate a problem? ---------- nosy: +serhiy.storchaka _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue16810> _______________________________________
Glenn Linderman added the comment: Thanks for the response, Serhiy. I misreported, but there is still a bug in this area, it seems. Attached is some code. I was printing out (too) many values from datetime to learn how it worked. I got confused on which ones were printed in which order. The attached code reduces the number of values printed to just those that should be consistent, but according to the docs, aren't. However, now that I figured out which ones were printed by which code, I no longer find a discrepancy between code and documentation, just a confusing interface whereby weekday can be obtained in three different forms. ---------- Added file: http://bugs.python.org/file28485/t38.py _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue16810> _______________________________________
Changes by Glenn Linderman <v+python@g.nevcal.com>: ---------- resolution: -> invalid status: open -> closed _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue16810> _______________________________________
Serhiy Storchaka added the comment: I don't see a difference. $ ./python -c 'import time; print(time.localtime())' time.struct_time(tm_year=2012, tm_mon=12, tm_mday=29, tm_hour=19, tm_min=36, tm_sec=35, tm_wday=5, tm_yday=364, tm_isdst=0) $ ./python -c 'import datetime; print(datetime.date.today().timetuple())' time.struct_time(tm_year=2012, tm_mon=12, tm_mday=29, tm_hour=0, tm_min=0, tm_sec=0, tm_wday=5, tm_yday=364, tm_isdst=-1) Can you please provide a full code which demonstrate a problem? ---------- nosy: +serhiy.storchaka _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue16810> _______________________________________
Glenn Linderman added the comment: Thanks for the response, Serhiy. I misreported, but there is still a bug in this area, it seems. Attached is some code. I was printing out (too) many values from datetime to learn how it worked. I got confused on which ones were printed in which order. The attached code reduces the number of values printed to just those that should be consistent, but according to the docs, aren't. However, now that I figured out which ones were printed by which code, I no longer find a discrepancy between code and documentation, just a confusing interface whereby weekday can be obtained in three different forms. ---------- Added file: http://bugs.python.org/file28485/t38.py _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue16810> _______________________________________
Changes by Glenn Linderman <v+python@g.nevcal.com>: ---------- resolution: -> invalid status: open -> closed _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue16810> _______________________________________
participants (2)
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Glenn Linderman -
Serhiy Storchaka