Re: outputting time in microseconds or milliseconds
i did:
from time import strftime, time
from datetime import datetime
now = datetime.now()
self.logfile.write('%s\t'%(strftime(%Y-%m-%d,)))
self.logfile.write('%s\t'%(now.strftime(%H:%M:%S.%f,)))
Note that you don't need the time module here. Datetime objects have
what you need all by themselves:
from datetime import datetime
now = datetime.now()
self.logfile.write('%s\t%s\n' % (now.strftime(%Y-%m-%d),
now.strftime(%H:%M:%S.%f)))
The time module was historically the way Python did time, but it
wasn't at all object-oriented and provided no direct support for date
arithmetic. When Tim Peters wrote datetime, the world became a better
place. Cozy up to the datetime documentation and put the time module
aside.
Skip
Skip
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Re: outputting time in microseconds or milliseconds
In article mailman.349.1375963829.1251.python-l...@python.org, Skip Montanaro s...@pobox.com wrote: When Tim Peters wrote datetime, the world became a better place. Lots of languages and databases have things called datetimes. It's easy to be lulled into thinking that they're all the same, but they're not. They all have slightly different ranges and precisions. Just something to be aware of. -- http://mail.python.org/mailman/listinfo/python-list
Re: outputting time in microseconds or milliseconds
Taking a step back, you're probably better off using datetimes. You'll
get all this conversion nonsense for free:
i did:
from time import strftime, time
from datetime import datetime
now = datetime.now()
self.logfile.write('%s\t'%(strftime(%Y-%m-%d,)))
self.logfile.write('%s\t'%(now.strftime(%H:%M:%S.%f,)))
this gives me:
2013-08-04 14:01:27.906126
2013-08-04 14:01:28.052273
2013-08-04 14:01:28.058967
2013-08-04 14:01:28.243959
2013-08-04 14:01:28.251107
2013-08-04 14:01:28.251268
2013-08-04 14:01:28.251373
2013-08-04 14:01:28.251475
2013-08-04 14:01:28.424568
2013-08-04 14:01:28.612548
2013-08-04 14:01:28.616569
2013-08-04 14:01:28.616727
2013-08-04 14:01:28.792487
2013-08-04 14:01:28.796226
thats what i need. Thanks!
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Re: outputting time in microseconds or milliseconds
Am 02.08.2013 15:17, schrieb matt.doolittl...@gmail.com:
so you are saying that
self.logfile.write('%s\t'%(str(time(
should be:
self.logfile.write('%s\t'%(str(time.time(
No, I'm not saying that. What I wanted to make clear is that your code
is impossible to understand as it stands, because nobody knows what
time refers to. My guess was that you had from time import time,
strftime somewhere in your code so that the time in your code refers
to the time function from Python's time module.
Uli
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Re: outputting time in microseconds or milliseconds
ok so now i import the module like this:
from time import strftime, time
i made the write statement like this:
self.logfile.write('%s\t'%(str(strftime(%Y-%m-%d,
self.logfile.write('%s\t'%(str(strftime(%H:%M:%S,
self.logfile.write('%s\t'%(str(time(
(oh and btw,i know the code is hacker ugly).
and the output is this:
2013-08-03 23:59:341375588774.89
2013-08-03 23:59:351375588775.06
2013-08-03 23:59:351375588775.25
2013-08-03 23:59:351375588775.43
2013-08-03 23:59:351375588775.80
2013-08-03 23:59:351375588775.99
2013-08-03 23:59:351375588775.99
2013-08-03 23:59:351375588775.99
2013-08-03 23:59:351375588776.00
2013-08-03 23:59:361375588776.15
2013-08-03 23:59:361375588776.15
2013-08-03 23:59:361375588776.16
2013-08-03 23:59:361375588776.16
2013-08-03 23:59:361375588776.16
2013-08-03 23:59:361375588776.16
2013-08-03 23:59:361375588776.16
2013-08-03 23:59:361375588776.16
2013-08-03 23:59:361375588776.16
2013-08-03 23:59:361375588776.34
2013-08-03 23:59:361375588776.35
2013-08-03 23:59:361375588776.35
2013-08-03 23:59:361375588776.35
the first two columns are for eyes so if they are a microsecond apart it
doesn't matter. the numbers in the third column are for calculating duration
which is where i need the precision.
Why is it only giving me the centisecond precision? the docs say i should get
microsecond precision with the code i put together.
Thanks!
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Re: outputting time in microseconds or milliseconds
matt.doolittl...@gmail.com writes:
self.logfile.write('%s\t'%(str(time(
[...]
2013-08-0323:59:341375588774.89
[...]
Why is it only giving me the centisecond precision? the docs say i
should get microsecond precision with the code i put together.
Because of str()'s default format. Use %f % (time()) (and maybe vary
the precision).
-- Alain.
P/S: using str() + string formatting is kind of overkill: either use
string format directives like %f, or use str() with simple string
concatenation -- the latter giving less control.
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Re: outputting time in microseconds or milliseconds
matt.doolittl...@gmail.com wrote:
ok so now i import the module like this:
from time import strftime, time
i made the write statement like this:
self.logfile.write('%s\t'%(str(strftime(%Y-%m-%d,
self.logfile.write('%s\t'%(str(strftime(%H:%M:%S,
self.logfile.write('%s\t'%(str(time(
(oh and btw,i know the code is hacker ugly).
and the output is this:
2013-08-0323:59:341375588774.89
2013-08-0323:59:351375588775.06
2013-08-0323:59:351375588775.25
2013-08-0323:59:351375588775.43
2013-08-0323:59:351375588775.80
2013-08-0323:59:351375588775.99
2013-08-0323:59:351375588775.99
2013-08-0323:59:351375588775.99
2013-08-0323:59:351375588776.00
2013-08-0323:59:361375588776.15
2013-08-0323:59:361375588776.15
2013-08-0323:59:361375588776.16
2013-08-0323:59:361375588776.16
2013-08-0323:59:361375588776.16
2013-08-0323:59:361375588776.16
2013-08-0323:59:361375588776.16
2013-08-0323:59:361375588776.16
2013-08-0323:59:361375588776.16
2013-08-0323:59:361375588776.34
2013-08-0323:59:361375588776.35
2013-08-0323:59:361375588776.35
2013-08-0323:59:361375588776.35
the first two columns are for eyes so if they are a microsecond apart it
doesn't matter.
But if the time is close enough to midnight, they'll be a *day* apart,
as I (and others) said before. It's also hard to imagine why you
resist the good advice you've been getting about formatting. You can
do both the date and time with one call to strftime().
the numbers in the third column are for calculating duration which is
where i need the precision.
Why is it only giving me the centisecond precision? the docs say i should
get microsecond precision with the code i put together.
Have you done any experimenting to decide which logic was losing those
extra digits? Sit in the debugger, and do a t = time.time()
Then investigate what t looks like,
by repr(t), str(t), and something %t
(for various values of something)
from time import time, localtime, strftime
now = time() #make a single call to get the time in seconds (float)
localnow = localtime(now)
out12 = strftime(%Y-%m-%d\t%H:%M:%S\t, localnow)
out3 = %.6f % now
self.logfile.write(out12 + out3)
You still have the problem that out12 is in the local time zone, while
out3 is in DCT. But as you say, these are for different audiences, and
presumably you won't really be putting them in the same file.
--
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Re: outputting time in microseconds or milliseconds
In article 07f6b1c7-069d-458b-a9fe-ff30c09f2...@googlegroups.com,
matt.doolittl...@gmail.com wrote:
self.logfile.write('%s\t'%(str(time(
[...]
1375588774.89
[...]
Why is it only giving me the centisecond precision? the docs say i should
get microsecond precision
When citing documentation, it's a good idea to provide a link to the
docs page, and/or a direct quote of what you read.
I'm looking at http://docs.python.org/2/library/time.html#time.time,
which says, not all systems provide time with a better precision than 1
second. So, I don't know where you got the impression that you're
guaranteed microsecond precision.
Earlier in the thread, you did mention that you're on Ubuntu, and there
you do indeed get pretty good precision. I'm not 100% sure if it's good
to the microsecond (it appears to be), but it's certainly better than
centisecond.
Anyway, your problem appears to be that str(float) gives you two digits
after the decimal (at least for values in the range we're talking about
here), but repr() will give you more:
t = time.time()
str(t)
'1375626035.26'
repr(t)
'1375626035.260934'
I don't know anywhere that those behaviors are guaranteed, however. If
you want to make sure you print a float with 6 digits after the decimal,
you should use %f, not %s:
'%.6f' % t
'1375626035.260934'
Of course, if the underlying system call that time.time() invokes
returns less precision than microseconds, some of those 6 digits may
always be zero. Or worse, garbage.
Taking a step back, you're probably better off using datetimes. You'll
get all this conversion nonsense for free:
print datetime.datetime.utcnow()
2013-08-04 14:33:09.255096
When I write an operating system, I'm going to have it keep time in
units of YiTp (Yobi Plank times).
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outputting time in microseconds or milliseconds
Hey everybody,
I am using 2.7 on Ubuntu 12.10. All I need to do is to print time with the
microseconds. I have been looking at the docs and trying things for about half
a day now with no success. Currently my code looks like this:
# write date and time and microseocnds
self.logfile.write('%s\t'%(str(strftime(%Y-%m-%d,
self.logfile.write('%s\t'%(str(strftime(%H:%M:%S,
self.logfile.write('%s\t'%(str(time(
the output looks like this:
2013-08-02 06:01:43 00:00:00
2013-08-02 06:01:43 00:00:00
2013-08-02 06:01:43 00:00:00
2013-08-02 06:01:43 00:00:00
2013-08-02 06:01:43 00:00:00
2013-08-02 06:01:43 00:00:00
2013-08-02 06:01:43 00:00:00
2013-08-02 06:01:43 00:00:00
2013-08-02 06:01:43 00:00:00
2013-08-02 06:01:44 00:00:00
2013-08-02 06:01:44 00:00:00
as you can see in the 2nd column the observations occur with 'fractional
second' frequency, up to 8 or 9 per second. You can also see my latest attempt
to get the microseconds in the third column is not working. It would really be
great if python had a way to just tack the microseconds (actually i think
milliseconds would be better) on to the second (in the 2nd column) as a
fraction. If this is not possible I need the extra write statement for just the
microseconds (millisecond if possible).
Any help will be much appreciated.
Thanks!
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Re: outputting time in microseconds or milliseconds
matt.doolittl...@gmail.com wrote:
Hey everybody,
I am using 2.7 on Ubuntu 12.10.
and what version of Python are you using? I don't know if it matters,
but it's useful to always supply both Python version and OS version.
All I need to do is to print time with the microseconds. I have been
looking at the docs and trying things for about half a day now with
no success. Currently my code looks like this:
# write date and time and microseocnds
self.logfile.write('%s\t'%(str(strftime(%Y-%m-%d,
self.logfile.write('%s\t'%(str(strftime(%H:%M:%S,
You've already got a problem: since this has two (implicit) calls to
localtime(). If this happens near enough to midnight, then your date
could be for one day, but the time for the following day.
You need to make a single call to get the time, and then format it into
one or more fields. if you didn't need sub-second information, it could
have been done by just using a longer spec for strftime().
self.logfile.write('%s\t'%(str(time(
When I test str(time()) I get an output like this:
1375444314.484557
I can't imagine how you would get that third column from the line you
quote above.
the output looks like this:
2013-08-0206:01:43 00:00:00
2013-08-0206:01:43 00:00:00
2013-08-0206:01:43 00:00:00
2013-08-0206:01:43 00:00:00
2013-08-0206:01:43 00:00:00
2013-08-0206:01:43 00:00:00
2013-08-0206:01:43 00:00:00
2013-08-0206:01:43 00:00:00
2013-08-0206:01:43 00:00:00
2013-08-0206:01:44 00:00:00
2013-08-0206:01:44 00:00:00
as you can see in the 2nd column the observations occur with 'fractional
second' frequency, up to 8 or 9 per second. You can also see my latest
attempt to get the microseconds in the third column is not working. It would
really be great if python had a way to just tack the microseconds (actually i
think milliseconds would be better) on to the second (in the 2nd column) as a
fraction. If this is not possible I need the extra write statement for just
the microseconds (millisecond if possible).
now = time() #make a single call to get the time in seconds (float)
localnow = localtime(now)
print(strftime(%Y-%m-%d\t%H:%M:%S\t, llocalnow))
print(now-int(now)) #obviously you should format this to get the
desired layout
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Re: outputting time in microseconds or milliseconds
Am 02.08.2013 12:54, schrieb matt.doolittl...@gmail.com:
I am using 2.7 on Ubuntu 12.10. All I need to do is to print time with the
microseconds.[...]
# write date and time and microseocnds
self.logfile.write('%s\t'%(str(strftime(%Y-%m-%d,
self.logfile.write('%s\t'%(str(strftime(%H:%M:%S,
self.logfile.write('%s\t'%(str(time(
the output looks like this:
2013-08-02 06:01:43 00:00:00
2013-08-02 06:01:43 00:00:00
2013-08-02 06:01:43 00:00:00
2013-08-02 06:01:43 00:00:00
2013-08-02 06:01:43 00:00:00
The output here and the code are surely not the same, provided that
time() is the same as Python's time.time(). That function will give
you the time as a floating-point number and with as much precision as is
available. You then only need the rest when dividing by one to get the
fractional seconds.
BTW:
1. You have a race condition, you are retrieving the time thrice, which
can and should yield different results for each call. Call it once, then
format the results in multiple steps if you want.
2. Python's strftime() gives you a string already, calling str() on it
is redundant. Also, formatting a string in order to then format it into
another string is unnecessary overhead. Further, '%s' will implicitly
invoke str() on the argument. Belt and suspenders anyone? :)
Good luck!
Uli
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Re: outputting time in microseconds or milliseconds
Perhaps use datetime? now = datetime.datetime.now() now.isoformat() '2013-08-02T07:37:08.430131' now.strftime(%f) '430131' Skip -- http://mail.python.org/mailman/listinfo/python-list
Re: outputting time in microseconds or milliseconds
On Fri, 02 Aug 2013 03:54:32 -0700, matt.doolittle33 wrote:
Hey everybody,
I am using 2.7 on Ubuntu 12.10. All I need to do is to print time with
the microseconds. I have been looking at the docs and trying things for
about half a day now with no success. Currently my code looks like
this:
# write date and time and microseocnds
self.logfile.write('%s\t'%(str(strftime(%Y-%m-%d,
self.logfile.write('%s\t'%(str(strftime(%H:%M:%S,
self.logfile.write('%s\t'%(str(time(
What's this time() function? Where does it come from, and what does it
do? By the look of it, it merely returns the string 00:00:00. The
time.time() function returns a number of seconds:
py %s % time.time()
'1375445812.873546'
so I'm not sure what function you are calling there.
Also, you don't need to call str() before using the %s template, since
that automatically converts any object to a string. Besides,
time.strftime already returns a string.
You can replace all of those above lines with a single format string:
py import time
py print(time.strftime(%Y-%m-%d\t%H:%M:%S))
2013-08-02 22:31:14
If you google for strftime millisecond with the search engine of your
choice:
https://duckduckgo.com/?q=strftime%20millisecond
you will find this bug report:
http://bugs.python.org/issue1982
Unfortunately, the %S.%f codes do not appear to work for me on Linux
using Python 2.6, 2.7 or 3.3. Perhaps you will have better luck.
--
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Re: outputting time in microseconds or milliseconds
On Fri, Aug 2, 2013 at 1:08 PM, Dave Angel da...@davea.name wrote: matt.doolittl...@gmail.com wrote: Hey everybody, I am using 2.7 on Ubuntu 12.10. and what version of Python are you using? I don't know if it matters, but it's useful to always supply both Python version and OS version. Looks to me like Python 2.7. ChrisA -- http://mail.python.org/mailman/listinfo/python-list
Re: outputting time in microseconds or milliseconds
so you are saying that
self.logfile.write('%s\t'%(str(time(
should be:
self.logfile.write('%s\t'%(str(time.time(
???
Thanks
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Re: outputting time in microseconds or milliseconds
On Friday, August 2, 2013 8:37:45 AM UTC-4, Skip Montanaro wrote:
Perhaps use datetime?
now = datetime.datetime.now()
now.isoformat()
'2013-08-02T07:37:08.430131'
now.strftime(%f)
'430131'
Skip
Thanks Skip, what i currently i have is:
dt = datetime.now()
and
self.logfile.write('%s\t'%(str(strftime(%Y-%m-%d,
self.logfile.write('%s\t'%(str(strftime(%H:%M:%S,
self.logfile.write('%s\t'%(str(dt.microsecond)))
what i get is this:
2013-08-02 09:52:20312961
2013-08-02 09:52:20313274
2013-08-02 09:52:20313461
2013-08-02 09:52:20313580
2013-08-02 09:52:20498705
2013-08-02 09:52:20508610
2013-08-02 09:52:20508963
2013-08-02 09:52:20509191
2013-08-02 09:52:20509477
2013-08-02 09:52:20509703
2013-08-02 09:52:20509798
2013-08-02 09:52:20509887
2013-08-02 09:52:20509975
2013-08-02 09:52:20511013
2013-08-02 09:52:2052
2013-08-02 09:52:20678554
2013-08-02 09:52:20687994
2013-08-02 09:52:20688291
2013-08-02 09:52:20688519
2013-08-02 09:52:20688740
2013-08-02 09:52:20688963
is the third column is only the microsecond? how could i get this to write
with the rest of the time (the hh:mm:ss) ?
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Re: outputting time in microseconds or milliseconds
On Friday, August 2, 2013 8:35:13 AM UTC-4, Steven D'Aprano wrote:
On Fri, 02 Aug 2013 03:54:32 -0700, matt.doolittle33 wrote:
Hey everybody,
I am using 2.7 on Ubuntu 12.10. All I need to do is to print time with
the microseconds. I have been looking at the docs and trying things for
about half a day now with no success. Currently my code looks like
this:
# write date and time and microseocnds
self.logfile.write('%s\t'%(str(strftime(%Y-%m-%d,
self.logfile.write('%s\t'%(str(strftime(%H:%M:%S,
self.logfile.write('%s\t'%(str(time(
What's this time() function? Where does it come from, and what does it
do? By the look of it, it merely returns the string 00:00:00. The
time.time() function returns a number of seconds:
py %s % time.time()
'1375445812.873546'
right this is the number that i need in the third column. so should i try?:
self.logfile.write('%s\t'%(str(time.time(
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Re: outputting time in microseconds or milliseconds
is the third column is only the microsecond? Yes. how could i get this to write with the rest of the time (the hh:mm:ss) ? It sounds like you really want the time formatted in a particular way, not just the numeric value of one or more fields. Look at the documentation for the strftime method of datetime objects for full details: http://docs.python.org/2/library/datetime.html#strftime-and-strptime-behavior Here's a simple example: import datetime now = datetime.datetime.now() now.strftime(%H:%M:%S.%f) '10:14:36.526110' Skip -- http://mail.python.org/mailman/listinfo/python-list
