How about:
from datetime import date, timedelta
# Define the weekday mnemonics to match the date.weekday function
(MON, TUE, WED, THU, FRI, SAT, SUN) = range(7)
def workdays(start_date, end_date, whichdays=(MON,TUE,WED,THU,FRI)):
'''
Calculate the number of working days between two dates inclusive
(start_date <= end_date).
The actual working days can be set with the optional whichdays
parameter
(default is MON-FRI)
'''
delta_days = (end_date - start_date).days + 1
full_weeks, extra_days = divmod(delta_days, 7)
# num_workdays = how many days/week you work * total # of weeks
num_workdays = (full_weeks + 1) * len(whichdays)
# subtract out any working days that fall in the 'shortened week'
for d in range(1, 8 - extra_days):
if (end_date + timedelta(d)).weekday() in whichdays:
num_workdays -= 1
return num_workdays
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