Python – Getting the Number of Days in a Month

The built-in calendar module gives you this useful list:

>>> calendar.mdays
[0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]

As an example of using it, here I get the number of days in the current month:

>>> import calendar
>>> import datetime
>>> calendar.mdays[datetime.date.today().month]
31

BTW this would also tell you the last day of a month.

Fine Print:

I’m not sure how this handles leap years. Perhaps mdays is for the current year? In any case, if you want something more robust you could try this:
[0]+[calendar.monthrange(year,month)[1] for year in [2006] for month in range(1,13)]
in place of calendar.mdays since you provide it with the year to use.

Found that idea in the comments here.

Posted by Greg Pinero (Primary Searcher) on Dec 21st, 2006 and is filed under Python.

Both comments and pings are currently closed.

Add this post to Del.icio.us - Digg

3 Responses to “Python – Getting the Number of Days in a Month”

  1. Brett Hoerner says:
    December 21st, 2006 at 12:40 pm

    For the record, the source of calendar.py (hooray open source!) shows:

    # Number of days per month (except for February in leap years)
    mdays = [0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]

    So it doesn’t currently (as of 2.5) do anything fancy and dynamic.

  2. Greg Pinero (Primary Searcher) says:
    December 21st, 2006 at 1:15 pm

    Thanks Brett. Open source is great. I do my robust method above is leap year sensitive …

  3. Greg Pinero (Primary Searcher) says:
    December 21st, 2006 at 1:15 pm

    do hope that is *