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bpo-14050: Note that not all data can be sorted (GH-15381) (GH-15395)

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(cherry picked from commit 4109263a7e)

Co-authored-by: Raymond Hettinger <rhettinger@users.noreply.github.com>
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Miss Islington (bot) 2019-08-22 09:39:52 -07:00 • committed by Raymond Hettinger
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Doc/tutorial/datastructures.rst
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@ -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: