From cc1c582f6fe450ce1c7de849137039e9b5fab8eb Mon Sep 17 00:00:00 2001
From: Raymond Hettinger <rhettinger@users.noreply.github.com>
Date: Mon, 27 May 2019 10:21:31 -0700
Subject: [PATCH] bpo-37051: Refine note on what objects are hashable
(GH-13587)
---
Doc/glossary.rst | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
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`.
--
2.49.0