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| author | Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> | 2019-05-27 10:43:18 -0700 |
|---|---|---|
| committer | Raymond Hettinger <rhettinger@users.noreply.github.com> | 2019-05-27 10:43:18 -0700 |
| commit | e8318f31f35dc851684c094b268e4a85d7f357c9 (patch) | |
| tree | 797d2022c0f4cbf8aad77bd4363fe52d4b0e65d8 /Doc | |
| parent | a79b6c578fcd2ea8be29440fdd8a998e5527200f (diff) | |
| download | cpython-git-e8318f31f35dc851684c094b268e4a85d7f357c9.tar.gz | |
bpo-37051: Refine note on what objects are hashable (GH-13587) (GH-13595)
(cherry picked from commit cc1c582f6fe450ce1c7de849137039e9b5fab8eb)
Co-authored-by: Raymond Hettinger <rhettinger@users.noreply.github.com>
Diffstat (limited to 'Doc')
| -rw-r--r-- | Doc/glossary.rst | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/Doc/glossary.rst b/Doc/glossary.rst index b6ab28617d..f7f35cbb67 100644 --- a/Doc/glossary.rst +++ b/Doc/glossary.rst @@ -508,8 +508,10 @@ 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`. |