some new features

.venv/lib/python3.12/site-packages/holidays/countries/monaco.py

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+#  holidays
+#  --------
+#  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.
+#
+#  Authors: Vacanza Team and individual contributors (see CONTRIBUTORS file)
+#           dr-prodigy <dr.prodigy.github@gmail.com> (c) 2017-2023
+#           ryanss <ryanssdev@icloud.com> (c) 2014-2017
+#  Website: https://github.com/vacanza/holidays
+#  License: MIT (see LICENSE file)
+
+from gettext import gettext as tr
+
+from holidays.calendars.gregorian import JAN
+from holidays.groups import ChristianHolidays, InternationalHolidays, StaticHolidays
+from holidays.observed_holiday_base import ObservedHolidayBase, SUN_TO_NEXT_MON
+
+
+class Monaco(ObservedHolidayBase, ChristianHolidays, InternationalHolidays, StaticHolidays):
+    """Monaco holidays.
+
+    References:
+        * <https://en.wikipedia.org/wiki/Public_holidays_in_Monaco>
+        * <https://web.archive.org/web/20231212161716/https://en.service-public-entreprises.gouv.mc/Employment-and-social-affairs/Employment-regulations/Leave/Public-Holidays>
+    """
+
+    country = "MC"
+    default_language = "fr"
+    # %s (observed).
+    observed_label = tr("%s (observé)")
+    supported_languages = ("en_US", "fr", "uk")
+
+    def __init__(self, *args, **kwargs):
+        ChristianHolidays.__init__(self)
+        InternationalHolidays.__init__(self)
+        StaticHolidays.__init__(self, MonacoStaticHolidays)
+        kwargs.setdefault("observed_rule", SUN_TO_NEXT_MON)
+        super().__init__(*args, **kwargs)
+
+    def _populate_public_holidays(self):
+        # New Year's Day.
+        self._add_observed(self._add_new_years_day(tr("Le jour de l'An")))
+
+        # Saint Devote's Day.
+        self._add_holiday_jan_27(tr("La Sainte Dévote"))
+
+        # Easter Monday.
+        self._add_easter_monday(tr("Le lundi de Pâques"))
+
+        # Labor Day.
+        self._add_observed(self._add_labor_day(tr("Fête de la Travaille")))
+
+        # Ascension Day.
+        self._add_ascension_thursday(tr("L'Ascension"))
+
+        # Whit Monday.
+        self._add_whit_monday(tr("Le lundi de Pentecôte"))
+
+        # Corpus Christi.
+        self._add_corpus_christi_day(tr("La Fête Dieu"))
+
+        # Assumption Day.
+        self._add_observed(self._add_assumption_of_mary_day(tr("L'Assomption de Marie")))
+
+        # All Saints' Day.
+        self._add_observed(self._add_all_saints_day(tr("La Toussaint")))
+
+        # Prince's Day.
+        self._add_observed(self._add_holiday_nov_19(tr("La Fête du Prince")))
+
+        # Immaculate Conception.
+        dec_8 = self._add_immaculate_conception_day(tr("L'Immaculée Conception"))
+        if self._year >= 2019:
+            self._move_holiday(dec_8, show_observed_label=False)
+
+        # Christmas Day.
+        self._add_observed(self._add_christmas_day(tr("Noël")))
+
+
+class MC(Monaco):
+    pass
+
+
+class MCO(Monaco):
+    pass
+
+
+class MonacoStaticHolidays:
+    special_public_holidays = {
+        # Public holiday.
+        2015: (JAN, 7, tr("Jour férié")),
+    }