weekdays in range

[Jive Dadson]

Ben Finney wrote:
> Jive Dadson <notontheweb at noisp.com> writes:
> 
>> Can someone think of an easy way to calculate the number of weekdays
>> between two calendar dates (in Python)?
> 
> That depends on what you mean by “weekdays”.
> 
>     >>> import datetime
>     >>> begin_date = datetime.date(2009, 10, 9)
>     >>> end_date = datetime.date(2009, 10, 22)
>     >>> import calendar
>     >>> print calendar.month(2009, 10)
>         October 2009
>     Mo Tu We Th Fr Sa Su
>               1  2  3  4
>      5  6  7  8  9 10 11
>     12 13 14 15 16 17 18
>     19 20 21 22 23 24 25
>     26 27 28 29 30 31
>     >>> end_date - begin_date
>     datetime.timedelta(13)
> 
> If you're expecting to exclude Saturday and Sunday (i.e. if you expect
> the above result to be 9 days instead of 13), you can use other
> functions of the ‘calendar’ module; try starting with:
> 
>     >>> friday_weekday = 4
>     >>> len([
>     ...     date for date in (
>     ...         begin_date + datetime.timedelta(days)
>     ...         for days in range((end_date - begin_date).days))
>     ...     if calendar.weekday(date.year, date.month, date.day) <= friday_weekday])
>     9
> 

Thanks for your help. For a non-expert at Python, that last compound 
statement is pretty inscrutable.  I am trying to scrute it.  Wish me luck.