Kent Johnson wrote:
> On Fri, May 15, 2009 at 12:46 AM, R K <wolf85boy2...@yahoo.com> wrote:
>> Gurus,
>>
>> I'm trying to write a fairly simple script that finds the number of hours /
>> minutes / seconds between now and the next Friday at 1:30AM.
>>
>> I have a few little chunks of code but I can't seem to get everything to
>> piece together nicely.
>>
>> import datetime,time
>> now = datetime.datetime.now()
>>
>> i = 0
>> dayOfWeek = datetime.datetime.now().strftime( '%a' )
>> while dayOfWeek != 'Fri':
>> delta = datetime.timedelta( days = i )
>> tom = ( now + delta ).strftime( '%a' )
>> if tom != 'Fri':
>> i = i + 1
>> else:
>> print i
>> print tom
>> break
>>
>> So with this code I can determine the number of days until the next Friday
>> (if it's not Friday already).
>
> This could be simpler. I would write
> nextFriday = datetime.datetime(now.year, now.month, now.day, 1, 30, 0)
> while nextFriday.weekday() != 4:
> nextFriday += datetime.timedelta(days=1)
>
> Note the use of datetime attributes instead of relying on strftime().
>
> What do you want the answer to be if you run the script at 1am Friday?
> at 2am Friday? If you want the next Friday in both cases, you could
> write this as
> nextFriday = datetime.datetime(now.year, now.month, now.day, 1, 30, 0)
> nextFriday += datetime.timedelta(days=1) # Make sure to get a Friday
> in the future
> while nextFriday.weekday() != 4:
> nextFriday += datetime.timedelta(days=1)
I don't believe you'll get much better than that, IMHO.
But, dateutil (3rd party) probably deserves a mention, at least, for
this kind of job. I'm pretty sure the dateutil equivalent of Kent's
second approach would look something like this, but I haven't thoroughly
tested it, YMMV ...
from datetime import datetime
from dateutil.relativedelta import relativedelta, FR
now = datetime.now()
delta = relativedelta(
days=1, weekday=FR, hour=1,
minute=30, second=0, microsecond=0
)
nextFriday = now + delta
print nextFriday
...
dateutil totally rocks, and I hope someday soon it will be included in
the standard library.
http://labix.org/python-dateutil
HTH,
Marty
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