cite cached_property

Author: graingert

src/textual/_compat.py

@@ -6,6 +6,13 @@
 if sys.version_info >= (3, 12):
     from functools import cached_property
 else:
+    # based on the code from Python 3.14:
+    # https://github.com/python/cpython/blob/
+    # 5507eff19c757a908a2ff29dfe423e35595fda00/Lib/functools.py#L1089-L1138
+    # Copyright (C) 2006 Python Software Foundation.
+    # vendored under the PYTHON SOFTWARE FOUNDATION LICENSE VERSION 2 because
+    # prior to Python 3.12 cached_property used a threading.Lock, which makes
+    # it very slow.
     _T_co = TypeVar("_T_co", covariant=True)
     _NOT_FOUND = object()