Use the list sort method:
In [1]: from datetime import date, timedelta
In [2]: a=[date.today(), date.today() + timedelta(days=1), date.today() - timedelta(days=1)]
In [3]: a
Out[3]:
[datetime.date(2012, 3, 28),
datetime.date(2012, 3, 29),
datetime.date(2012, 3, 27)]
In [4]: a.sort()
In [5]: a
Out[5]:
[datetime.date(2012, 3, 27),
datetime.date(2012, 3, 28),
datetime.date(2012, 3, 29)]
In [6]: a[0] # min
Out[6]: datetime.date(2012, 3, 27)
In [7]: a[-1] # max
Out[7]: datetime.date(2012, 3, 29)
More on how to sort.
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