Previous weekday in Python
Simply subtract a day from the given date, then check if the date is a weekday. If not, subtract another, until you do have a weekday:
from datetime import date, timedeltadef prev_weekday(adate): adate -= timedelta(days=1) while adate.weekday() > 4: # Mon-Fri are 0-4 adate -= timedelta(days=1) return adate
Demo:
>>> prev_weekday(date.today())datetime.date(2012, 8, 20)>>> prev_weekday(date(2012, 8, 20))datetime.date(2012, 8, 17)
Alternatively, use an offset table; no need to make this a mapping, a tuple will do just fine:
_offsets = (3, 1, 1, 1, 1, 1, 2)def prev_weekday(adate): return adate - timedelta(days=_offsets[adate.weekday()])
See the datetime module, in particular the date()
and weekday()
function. For example:
import datetimetemp = datetime.date(2012,8,21) # Today's date: 2012/08/21print temp.weekday()
This will output 1
. 0
stands for Monday, 1
for Tuesday, etc., until 6
for Sunday. Finding the preceding weekday is easy from here.