A fast, efficient Python library for generating country, province and state
specific sets of holidays on the fly. It aims to make determining whether a
specific date is a holiday as fast and flexible as possible.

from datetime import date
import holidays

date(2015, 1, 1) in us_holidays  # True
date(2015, 1, 2) in us_holidays  # False

WWW: https://github.com/dr-prodigy/python-holidays