From: Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> Date: Thu, 22 Aug 2019 16:39:52 +0000 (-0700) Subject: bpo-14050: Note that not all data can be sorted (GH-15381) (GH-15395) X-Git-Tag: v3.8.0b4~72 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=cb8de91dadf15925fb95069cb190398e1d485f56;p=thirdparty%2FPython%2Fcpython.git bpo-14050: Note that not all data can be sorted (GH-15381) (GH-15395) (cherry picked from commit 4109263a7edce11194e301138cf66fa2d07f7ce4) Co-authored-by: Raymond Hettinger --- diff --git a/Doc/tutorial/datastructures.rst b/Doc/tutorial/datastructures.rst index 01e437bb5da8..a0d56274fd7e 100644 --- a/Doc/tutorial/datastructures.rst +++ b/Doc/tutorial/datastructures.rst @@ -125,6 +125,13 @@ only modify the list have no return value printed -- they return the default ``None``. [1]_ This is a design principle for all mutable data structures in Python. +Another thing you might notice is that not all data can be sorted or +compared. For instance, ``[None, 'hello', 10]`` doesn't sort because +integers can't be compared to strings and *None* can't be compared to +other types. Also, there are some types that don't have a defined +ordering relation. For example, ``3+4j < 5+7j`` isn't a valid +comparison. + .. _tut-lists-as-stacks: