是否有相当于 Java 的 Calendar.DAY_OF_WEEK_IN_MONTH 的 Python？

Question

My aim is to find which nth day of week in the month is a given date? For example, I want to be able to have the following:

Input :

21 December 2020

Output :

3rd Monday of this month

Java's Calendar library does exactly what I need as illustrated here . Looking for a Python equivalent or an already existing answer pointing to the same (I tried a lot to find but in vain. So I gave up and am asking here as a last resort).

Answer 1

AFAIK there is no built-in function for this, but it's easy to implement:

from datetime import date
from math import ceil

d = date.fromisoformat('2020-12-21')
d.strftime(f"{(dom := (ceil(d.day / 7)))}{'rd' if dom > 1 else 'st'} %A of this Month")

Of course, for string representation, you need to take into account the several ordinal indicators (st, nd, rd, th). If you, on the other hand, just want to get the number of the month occuring, you can just use:

ceil(d.day / 7)