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Get the last Thursday of the current month using Python

 3 years ago
source link: https://www.codesd.com/item/get-the-last-thursday-of-the-current-month-using-python.html
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Get the last Thursday of the current month using Python

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Following this answer I tried to get the date for last Thursday of the current month. But my code doesn't get out of loop.

from datetime import datetime
from dateutil.relativedelta import relativedelta, TH

todayte = datetime.today()
cmon = todayte.month

nthu = todayte
while nthu.month == cmon:
    nthu += relativedelta(weekday=TH(1))
    #print nthu.strftime('%d%b%Y').upper()

Looking at the documentation of relativedelta

Notice that if the calculated date is already Monday, for example, using (0, 1) or (0, -1) won’t change the day.

If nthu is already Thursday then adding TH(1) or TH(-1) won't have any effect but result in the same date and that's why your loop is running infinitely.

I will assume maximum 5 weeks in a month and do it like following:

todayte = datetime.today()
cmon = todayte.month

for i in range(1, 6):
    t = todayte + relativedelta(weekday=TH(i))
    if t.month != cmon:
        # since t is exceeded we need last one  which we can get by subtracting -2 since it is already a Thursday.
        t = t + relativedelta(weekday=TH(-2))
        break

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