From: Raymond Hettinger <rhettinger@users.noreply.github.com>
Date: Mon, 27 May 2019 17:21:31 +0000 (-0700)
Subject: bpo-37051: Refine note on what objects are hashable (GH-13587)
X-Git-Tag: v3.8.0b1~188
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=cc1c582f6fe450ce1c7de849137039e9b5fab8eb;p=python

bpo-37051: Refine note on what objects are hashable (GH-13587)
---

diff --git a/Doc/glossary.rst b/Doc/glossary.rst
index d3ce365255..177df54ef2 100644
--- a/Doc/glossary.rst
+++ b/Doc/glossary.rst
@@ -512,8 +512,10 @@ Glossary
       Hashability makes an object usable as a dictionary key and a set member,
       because these data structures use the hash value internally.
 
-      All of Python's immutable built-in objects are hashable; mutable
-      containers (such as lists or dictionaries) are not.  Objects which are
+      Most of Python's immutable built-in objects are hashable; mutable
+      containers (such as lists or dictionaries) are not; immutable
+      containers (such as tuples and frozensets) are only hashable if
+      their elements are hashable.  Objects which are
       instances of user-defined classes are hashable by default.  They all
       compare unequal (except with themselves), and their hash value is derived
       from their :func:`id`.