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Is there a way using Python's standard library to easily determine (i.e. one function call) the last day of a given month?

If the standard library doesn't support that, does the dateutil package support this?

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I didn't notice this earlier when I was looking at the documentation for the calendar module, but a method called monthrange provides this information:

monthrange(year, month)

Returns weekday of first day of the month and number of days in month, for the specified year and month.

>>> import calendar

>>> calendar.monthrange(2002,1)

(1, 31)

>>> calendar.monthrange(2008,2)

(4, 29)

>>> calendar.monthrange(2100,2)

(0, 28)

so:

calendar.monthrange(year, month)[1]

seems like the simplest way to go.

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

>>> from calendar import monthrange

>>> monthrange(2012, 2)

(2, 29)

My previous answer still works, but is clearly suboptimal.