some new features

.venv/lib/python3.12/site-packages/holidays/calendars/custom.py

@@ -0,0 +1,34 @@
+#  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 _CustomCalendarType(type):
+    """Helper class for simple calendar customization.
+
+    Renames child class public attributes keeping the original data under a new
+    name with a `CUSTOM_ATTR_POSTFIX` postfix.
+
+    Allows for better readability of customized lunisolar calendar dates.
+    """
+
+    CUSTOM_ATTR_POSTFIX = "CUSTOM_CALENDAR"
+
+    def __new__(cls, name, bases, namespace):
+        for attr in (key for key in tuple(namespace.keys()) if key[0] != "_"):
+            namespace[f"{attr}_{_CustomCalendar.CUSTOM_ATTR_POSTFIX}"] = namespace[attr]
+            del namespace[attr]
+
+        return super().__new__(cls, name, bases, namespace)
+
+
+class _CustomCalendar(metaclass=_CustomCalendarType):
+    pass