How do we determine the number of days for a given month in python [duplicate]

This question already has answers here: How to get the last day of the month? (44 answers) Closed 9 years ago.

I need to calculate the number of days for a given month in python. If a user inputs Feb开发者_JAVA百科 2011 the program should be able to tell me that Feb 2011 has 28 days. Could anyone tell me which library I should use to determine the length of a given month?

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You should use calendar.monthrange:

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

Just to be clear, monthrange supports leap years as well:

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

As @mikhail-pyrev mentions in a comment:

First number is the weekday of the first day of the month, the second number is the number of days in said month.

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Alternative solution:

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

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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