python date of the previous month

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datetime and the datetime.timedelta classes are your friend.

  1. find today.
  2. use that to find the first day of this month.
  3. use timedelta to backup a single day, to the last day of the previous month.
  4. print the YYYYMM string you’re looking for.

Like this:

 import datetime
 today = datetime.date.today()
 first = today.replace(day=1)
 last_month = first - datetime.timedelta(days=1)
 print(last_month.strftime("%Y%m"))

201202 is printed.

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