Emphasize that Unpickler.memo is not necessarily a dict.

diff --git a/Doc/library/pickle.rst b/Doc/library/pickle.rst
index 0a958a7e9b32d40fe9ed10357e7e0eed39734350..6c2b26959f934bbea9a3f8b2fc45089736eff2d2 100644 (file)
--- a/Doc/library/pickle.rst
+++ b/Doc/library/pickle.rst
@@ -334,8 +334,9 @@ The :mod:`pickle` module exports two classes, :class:`Pickler` and
 
    .. attribute:: memo
 
-      Dictionary holding previously unpickled objects to allow shared or
-      recursive objects to unpickled by reference as opposed to by value.
+      Dictionary-like object holding previously unpickled objects to allow
+      shared or recursive objects to unpickled by reference as opposed to
+      by value.
 
 
 .. _pickle-picklable: