How to determine the number of days for a given month in python

Question

I need to calculate the number of days for a given month in python. If the user enters February 2011, the program should be able to tell me that in February 2011 there were 28 days. Can someone tell me which library should I use to determine the length of a given month.

Answer 1

Use calendar.monthrange :

 >>> from calendar import monthrange >>> monthrange(2011, 2) (1, 28) 

To be clear, monthrange also supports leap years:

 >>> from calendar import monthrange >>> monthrange(2012, 2) (2, 29) 

Answer 2

Alternative solution:

 >>> from datetime import date >>> (date(2012, 3, 1) - date(2012, 2, 1)).days 29 

Answer 3

Just for the sake of academic interest, I did it this way ...

 (dt.replace(month = dt.month % 12 +1, day = 1)-timedelta(days=1)).day