How to get the date N days ago in Python

from datetime import datetime, timedelta

N = 2

date_N_days_ago = datetime.now() - timedelta(days=N)

print datetime.now()
print date_N_days_ago

Results:

2010-10-16 00:06:06.000201
2010-10-14 00:06:06.000107

For more information see the timedelta documentation