In brief
calendar.monthrange(2024, 2) returns the weekday of the first day and the number of days in the month. The second result is 29 for that February.
Useful to know
calendar.monthrange(2024, 2) returns the weekday of the first day and the number of days in the month. The second result is 29 for that February. [1]
This helps build a calendar without maintaining a separate leap-year table. The first result uses Monday as zero. Do not confuse it with a day-of-month number or an automatically localized label.
Sources
For further detail and to check the information: