On Tue, Sep 8, 2009 at 10:49 AM, Gonzalo<gonzill...@gmail.com> wrote: > > Hi Daniel, thanks for your reply apologies for the muddled question. > > What I need to do is the following: > > I receive a piece of data from the serial port, determine node and > timestamp it. > then when I receive the next piece of date form the same node I > timestamp it and determine the time difference form the previous > reading. > > Before using Django I was timestamping data with: > > time_start = time.strftime( '%Y-%m-%d %H:%M:%S' ) > > and computing time difference with: > > time_difference = int( time.mktime( time_end ) - time.mktime > ( time_start ) ) > > that didn't work with django because of the format required by > DateTimeField() > > now I'm doing: > >>>> time_start = datetime.datetime.now() >>>> time_start > datetime.datetime(2009, 9, 8, 15, 46, 9, 544688) >>>> time_end = datetime.datetime.now() >>>> time_end > datetime.datetime(2009, 9, 8, 15, 46, 32, 353081) >>>> time_diff = time_start - time_end >>>> time_diff > datetime.timedelta(-1, 86377, 191607) >>>> print int(time_diff) > Traceback (most recent call last): > File "<stdin>", line 1, in <module> > TypeError: int() argument must be a string or a number, not > 'datetime.timedelta' > > how would you compute the time_diff between the two datetime.datetime > objects? > > Thank you, > > On Sep 8, 11:18 am, Daniel Roseman <dan...@roseman.org.uk> wrote: >> On Sep 8, 10:26 am, Gonzillaaa <gonzill...@gmail.com> wrote: >> >> > Hello I'm importing data into django and using its admin interface to >> > browse and search for data. >> >> > Each piece of data is timestamped by me at log time. The docs say data >> > on a DateTimeField() should be a valid datetime.datetime object but I >> > am unclear of format (tuple, string etc..) >> >> Your question doesn't make sense. As you say, the docs say it should >> be a datetime.datetime object. What does format have to do with it? >> >> > data = InfrarredTimes( loc_id = loc, node_id = node_id, pin_id >> > = pin_id, \ >> > time_start = time.strftime( '%Y-%m-%d >> > %H:%M:%S', time_start ), \ >> > time_end = time.strftime( '%Y-%m-%d %H: >> > %M:%S', time_end ), \ >> > time_difference = time_difference ) >> > data.save() >> > return True >> >> > this is not working at the moment. any pointers much appreciated. >> >> But you've ignored the bit that you quoted above! Why are you using >> time instead of datetime? Why are you converting the time into a >> string instead of a datetime object? >> >> time_start = datetime.datetime(2009, 9, 8, 11, 15) >> -- >> DR.
Stop calling int on the return value >>> import datetime >>> time_start = datetime.datetime.now() >>> time_end = datetime.datetime.now() >>> time_diff = time_end - time_start >>> time_diff datetime.timedelta(0, 9, 126708) >>> print time_diff 0:00:09.126708 -- We are all slave to our own paradigm. -- Joshua Williams If the letters PhD appear after a person's name, that person will remain outdoors even after it's started raining. -- Jeff Kay --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/django-users?hl=en -~----------~----~----~----~------~----~------~--~---
