How to get the first/last day of the previous month?

>>> from datetime import date
>>> from dateutil.relativedelta import relativedelta
>>> today = date.today()
>>> d = today - relativedelta(months=1)
>>> date(d.year, d.month, 1)
datetime.date(2008, 12, 1)
>>> date(today.year, today.month, 1) - relativedelta(days=1)
datetime.date(2008, 12, 31)
>>>