This small blog post explains how to get the last day of a given month in Python. As example I print a list of months in a given year range. Each line will contain the start- and enddate of that month.

Iterate months in a range of years

The following piece of Python code prints every month in given range of years.

Code

import calendar

for y in range(2014, 2021):
    for m in range(1, 13):
        w, d = calendar.monthrange(y, m)
        print(f'{y}-{m:02d}-01 {y}-{m:02d}-{d}')

Result

2014-01-01 2014-01-31
2014-02-01 2014-02-28
...
2020-11-01 2020-11-30
2020-12-01 2020-12-31

Explained

range(n)
Is of exclusive nature, apply +1 to get inclusive number range.

calendar.monthrange(y, m)
Returns weekday of first day of the month and number of days in month.

{m:02d}
Appends a leading zero to the month number.