some new features

.venv/lib/python3.12/site-packages/holidays/mixins/preferred_discretionary_holidays.py

@@ -0,0 +1,28 @@
+#  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)
+
+
+class PreferredDiscretionaryHolidays:
+    """A mixin for setting preferred discretionary holidays.
+
+    See [HongKong][holidays.countries.hongkong.HongKong] for an example.
+    """
+
+    default_preferred_discretionary_holidays: tuple[str, ...] = ()
+    """Preferred discretionary holidays defaults."""
+
+    def __init__(self, preferred_discretionary_holidays):
+        self.preferred_discretionary_holidays = set(
+            preferred_discretionary_holidays
+            if preferred_discretionary_holidays
+            else self.default_preferred_discretionary_holidays
+        )