Calc start date and end date of a given week.

from datetime import date, timedelta

def calc(year, week):
    d = date(year,1,1)
    d = d - timedelta(d.weekday())
    dlt = timedelta(days = (week-1)*7)
    return d + dlt,  d + dlt + timedelta(days=6)

Numbers are passion, Python is fascinating, I am amused

The following 4 lines says it all:
x = 2
for y in range(2,24):
... x= x*x*y
... print x, '\n'

Watching the generated numbers running on the screen get me so high that I feel I can start writing poetry.
Try it for yourself