Re: Creating time stamps
On Mon, 22 Jul 2019 16:25:32 -0500, Michael F. Stemper wrote:
> On 22/07/2019 15.58, Chris Angelico wrote:
>> On Tue, Jul 23, 2019 at 6:34 AM Michael F. Stemper
>> wrote:
>>>
[snip]
>>> from datetime import datetime
>>> from time import strftime
>>> timestamp = datetime.now().strftime( "%Y-%m-%d %H:%M" )
[snip]
>>
>> What's the second import doing though? You never use strftime.
>
> Cleaned my contacts, cleaned my readers. Still see strftime() in the
> third line. Tried to run the code without the second line. It ran
> without complaint.
>
> Apparently, the strftime() in that last line is not the one that I
> explicitly imported, but a method of datetime.now(). Did I get that
> right?
Yes, you got that right. The statement datetime.now().strftime("...")
says that datetime.now will return an object that has a method
named strftime, and calling that method is the next thing to be done.
Other things that happen to be lying around named strftime just have
no part in the conversation.
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Re: Creating time stamps
On 22/07/2019 16.00, Stefan Ram wrote: > "Michael F. Stemper" writes: >> The first seems a little clunky with its accessing of multiple >> attributes, but the second has an additional import. Is there >> any reason to prefer one over the other? > > |>>> import datetime > |>>> datetime.datetime.now().replace(microsecond=0).isoformat() > |'2019-07-22T21:59:58' Yeah, if I'd wanted that format, isoformat() would have been simpler. Since I did not want seconds, or the letter "T", I had to go for a home-brewed solution. -- Michael F. Stemper No animals were harmed in the composition of this message. -- https://mail.python.org/mailman/listinfo/python-list
Re: Creating time stamps
On 2019-07-22 22:41, Grant Edwards wrote: On 2019-07-22, Michael F. Stemper wrote: from datetime import datetime from time import strftime timestamp = datetime.now().strftime( "%Y-%m-%d %H:%M" ) [...] Apparently, the strftime() in that last line is not the one that I explicitly imported, but a method of datetime.now(). Did I get that right? Exactly. You can tell that it's a method because it's: something.strftime(...) If it was using the imported 'strftime' then it would be: timestamp = strftime(...) -- https://mail.python.org/mailman/listinfo/python-list
Re: Creating time stamps
On 2019-07-22, Michael F. Stemper wrote: >>> from datetime import datetime >>> from time import strftime >>> timestamp = datetime.now().strftime( "%Y-%m-%d %H:%M" ) [...] > Apparently, the strftime() in that last line is not the one that I > explicitly imported, but a method of datetime.now(). Did I get that > right? Exactly. -- Grant Edwards grant.b.edwardsYow! TONY RANDALL! Is YOUR at life a PATIO of FUN?? gmail.com -- https://mail.python.org/mailman/listinfo/python-list
Re: Creating time stamps
On 22/07/2019 15.58, Chris Angelico wrote: > On Tue, Jul 23, 2019 at 6:34 AM Michael F. Stemper > wrote: >> >> I have some code that generates a time-stamp as follows: >> >> from datetime import datetime >> tt = datetime.now() >> timestamp = "%4d-%02d-%02d %02d:%02d" % \ >> (tt.year, tt.month, tt.day, tt.hour, tt.minute) >> >> I later realized that I could have written it as: >> >> from datetime import datetime >> from time import strftime >> timestamp = datetime.now().strftime( "%Y-%m-%d %H:%M" ) >> >> The first seems a little clunky with its accessing of multiple >> attributes, but the second has an additional import. Is there >> any reason to prefer one over the other? > > What's the second import doing though? You never use strftime. Cleaned my contacts, cleaned my readers. Still see strftime() in the third line. Tried to run the code without the second line. It ran without complaint. Apparently, the strftime() in that last line is not the one that I explicitly imported, but a method of datetime.now(). Did I get that right? > I'd go > with the second one, but with just a single import. Sounds like a winner to me. Thanks. -- Michael F. Stemper 87.3% of all statistics are made up by the person giving them. -- https://mail.python.org/mailman/listinfo/python-list
Re: Creating time stamps
On 22 Jul 2019 23:12, Skip Montanaro wrote:
Assuming you're using Python 3, why not use an f-string?
>>> dt = datetime.datetime.now()
>>> dt.strftime("%Y-%m-%d %H:%M")
'2019-07-22 16:10'
>>> f"{dt:%Y-%m-%d %H:%M}"
'2019-07-22 16:10'
===》》 Or if you're running < Python 3.6 (no f strings): format(datetime.now(),
"%Y-%m-%d %H:%M")
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Re: Creating time stamps
Assuming you're using Python 3, why not use an f-string?
>>> dt = datetime.datetime.now()
>>> dt.strftime("%Y-%m-%d %H:%M")
'2019-07-22 16:10'
>>> f"{dt:%Y-%m-%d %H:%M}"
'2019-07-22 16:10'
Skip
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Re: Creating time stamps
On Tue, Jul 23, 2019 at 6:34 AM Michael F. Stemper wrote: > > I have some code that generates a time-stamp as follows: > > from datetime import datetime > tt = datetime.now() > timestamp = "%4d-%02d-%02d %02d:%02d" % \ > (tt.year, tt.month, tt.day, tt.hour, tt.minute) > > I later realized that I could have written it as: > > from datetime import datetime > from time import strftime > timestamp = datetime.now().strftime( "%Y-%m-%d %H:%M" ) > > The first seems a little clunky with its accessing of multiple > attributes, but the second has an additional import. Is there > any reason to prefer one over the other? > What's the second import doing though? You never use strftime. I'd go with the second one, but with just a single import. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Creating time stamps
I have some code that generates a time-stamp as follows: from datetime import datetime tt = datetime.now() timestamp = "%4d-%02d-%02d %02d:%02d" % \ (tt.year, tt.month, tt.day, tt.hour, tt.minute) I later realized that I could have written it as: from datetime import datetime from time import strftime timestamp = datetime.now().strftime( "%Y-%m-%d %H:%M" ) The first seems a little clunky with its accessing of multiple attributes, but the second has an additional import. Is there any reason to prefer one over the other? -- Michael F. Stemper There's no "me" in "team". There's no "us" in "team", either. -- https://mail.python.org/mailman/listinfo/python-list
