gh-120937: Reference weakref from the `__del__` documentation (#120940)

Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>

diff --git a/Doc/reference/datamodel.rst b/Doc/reference/datamodel.rst
index af4c585e1c3e2f84d1dc71f6d687b983cf2d4e3f..34d8bbee4c680618ace48a48d7d94ac069859659 100644 (file)
--- a/Doc/reference/datamodel.rst
+++ b/Doc/reference/datamodel.rst
@@ -1667,6 +1667,8 @@ Basic customization
 
    It is not guaranteed that :meth:`__del__` methods are called for objects
    that still exist when the interpreter exits.
+   :class:`weakref.finalize` provides a straightforward way to register
+   a cleanup function to be called when an object is garbage collected.
 
    .. note::