some new features

.venv/lib/python3.12/site-packages/holidays/groups/custom.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 datetime import date
+
+from holidays.helpers import _normalize_tuple
+
+
+class StaticHolidays:
+    """Helper class for special and substituted holidays support.
+
+    Populates special and substituted holidays related data from
+    an external class.
+    """
+
+    def __init__(self, cls) -> None:
+        for attribute_name in cls.__dict__.keys():
+            # Special holidays.
+            if attribute_name.startswith("special_") and (
+                value := getattr(cls, attribute_name, None)
+            ):
+                setattr(self, attribute_name, value)
+                self.has_special_holidays = True
+
+            # Substituted holidays.
+            elif attribute_name.startswith("substituted_") and (
+                value := getattr(cls, attribute_name, None)
+            ):
+                setattr(self, attribute_name, value)
+                self.has_substituted_holidays = True
+
+        # Populate substituted holidays from adjacent years.
+        self.weekend_workdays = set()
+        for special_public_holidays in getattr(self, "special_public_holidays", {}).values():
+            for special_public_holiday in _normalize_tuple(special_public_holidays):
+                if len(special_public_holiday) == 5:  # The fifth element is the year.
+                    _, _, from_month, from_day, from_year = special_public_holiday
+                    self.weekend_workdays.add(date(from_year, from_month, from_day))