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| -rw-r--r-- | Doc/tutorial/datastructures.rst | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/Doc/tutorial/datastructures.rst b/Doc/tutorial/datastructures.rst index 01e437b..a0d5627 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: |