some new features

.venv/lib/python3.12/site-packages/holidays/countries/poland.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 NOV
+from holidays.groups import ChristianHolidays, InternationalHolidays, StaticHolidays
+from holidays.holiday_base import HolidayBase
+
+
+class Poland(HolidayBase, ChristianHolidays, InternationalHolidays, StaticHolidays):
+    """Poland holidays.
+
+    References:
+        * <https://en.wikipedia.org/wiki/Public_holidays_in_Poland>
+        * <https://pl.wikipedia.org/wiki/Dni_wolne_od_pracy_w_Polsce>
+        * <https://web.archive.org/web/20250402103635/https://isap.sejm.gov.pl/isap.nsf/DocDetails.xsp?id=WDU20240001965>
+    """
+
+    country = "PL"
+    default_language = "pl"
+    supported_languages = ("de", "en_US", "pl", "uk")
+    start_year = 1925
+
+    def __init__(self, *args, **kwargs):
+        ChristianHolidays.__init__(self)
+        InternationalHolidays.__init__(self)
+        StaticHolidays.__init__(self, PolandStaticHolidays)
+        super().__init__(*args, **kwargs)
+
+    def _populate_public_holidays(self):
+        # New Year's Day.
+        self._add_new_years_day(tr("Nowy Rok"))
+
+        if self._year <= 1960 or self._year >= 2011:
+            # Epiphany.
+            self._add_epiphany_day(tr("Święto Trzech Króli"))
+
+        if self._year <= 1950:
+            # Candlemas.
+            self._add_candlemas(tr("Oczyszczenie Najświętszej Marii Panny"))
+
+        # Easter Sunday.
+        self._add_easter_sunday(tr("Niedziela Wielkanocna"))
+
+        # Easter Monday.
+        self._add_easter_monday(tr("Poniedziałek Wielkanocny"))
+
+        if self._year >= 1950:
+            # National Day.
+            self._add_holiday_may_1(tr("Święto Państwowe"))
+
+        if self._year <= 1950 or self._year >= 1990:
+            # National Day of the Third of May.
+            self._add_holiday_may_3(tr("Święto Narodowe Trzeciego Maja"))
+
+        if 1946 <= self._year <= 1950:
+            # National Victory and Freedom Day.
+            self._add_holiday_may_9(tr("Narodowe Święto Zwycięstwa i Wolności"))
+
+        if self._year <= 1950:
+            # Ascension Day.
+            self._add_ascension_thursday(tr("Wniebowstąpienie Pańskie"))
+
+        # Pentecost.
+        self._add_whit_sunday(tr("Zielone Świątki"))
+
+        if self._year <= 1950:
+            # Whit Monday.
+            self._add_whit_monday(tr("Drugi dzień Zielonych Świątek"))
+
+        # Corpus Christi.
+        self._add_corpus_christi_day(tr("Dzień Bożego Ciała"))
+
+        if self._year <= 1950:
+            self._add_saints_peter_and_paul_day(
+                # Saints Peter and Paul Day.
+                tr("Uroczystość Świętych Apostołów Piotra i Pawła")
+            )
+
+        if 1945 <= self._year <= 1989:
+            # National Day of Rebirth of Poland.
+            self._add_holiday_jul_22(tr("Narodowe Święto Odrodzenia Polski"))
+
+        if self._year <= 1960 or self._year >= 1989:
+            # Assumption Day.
+            self._add_assumption_of_mary_day(tr("Wniebowzięcie Najświętszej Marii Panny"))
+
+        # All Saints' Day.
+        self._add_all_saints_day(tr("Uroczystość Wszystkich Świętych"))
+
+        if 1937 <= self._year <= 1944 or self._year >= 1989:
+            # National Independence Day.
+            self._add_holiday_nov_11(tr("Narodowe Święto Niepodległości"))
+
+        if self._year <= 1950:
+            self._add_immaculate_conception_day(
+                # Immaculate Conception of the Blessed Virgin Mary.
+                tr("Niepokalane Poczęcie Najświętszej Marii Panny")
+            )
+
+        if self._year >= 2025:
+            # Christmas Eve.
+            self._add_christmas_eve(tr("Wigilia Bożego Narodzenia"))
+
+        # Christmas Day.
+        self._add_christmas_day(tr("Boże Narodzenie (pierwszy dzień)"))
+
+        # Second Day of Christmas.
+        self._add_christmas_day_two(tr("Boże Narodzenie (drugi dzień)"))
+
+
+class PL(Poland):
+    pass
+
+
+class POL(Poland):
+    pass
+
+
+class PolandStaticHolidays:
+    special_public_holidays = {
+        # National Independence Day - 100th anniversary.
+        2018: (NOV, 12, tr("Narodowe Święto Niepodległości - 100-lecie")),
+    }