gh-66944: Note that the contextlib.closing example is for illustrative purposes (#112198)

scop · AA-Turner · web-flow · commit 9af9ac153acb · 2024-01-23T01:00:53.000Z
Co-authored-by: Adam Turner &lt;9087854+AA-Turner@users.noreply.github.com&gt;
diff --git a/Doc/library/contextlib.rst b/Doc/library/contextlib.rst
@@ -182,6 +182,14 @@ Functions and classes provided:
    without needing to explicitly close ``page``.  Even if an error occurs,
    ``page.close()`` will be called when the :keyword:`with` block is exited.
 
+   .. note::
+
+      Most types managing resources support the :term:`context manager` protocol,
+      which closes *thing* on leaving the :keyword:`with` statment.
+      As such, :func:`!closing` is most useful for third party types that don't
+      support context managers.
+      This example is purely for illustration purposes,
+      as :func:`~urllib.request.urlopen` would normally be used in a context manager.
 
 .. function:: aclosing(thing)
 
