bpo-14050: Note that not all data can be sorted (GH-15381)
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@ -125,6 +125,13 @@ only modify the list have no return value printed -- they return the default
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``None``. [1]_ This is a design principle for all mutable data structures in
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Python.
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Another thing you might notice is that not all data can be sorted or
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compared. For instance, ``[None, 'hello', 10]`` doesn't sort because
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integers can't be compared to strings and *None* can't be compared to
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other types. Also, there are some types that don't have a defined
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ordering relation. For example, ``3+4j < 5+7j`` isn't a valid
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comparison.
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.. _tut-lists-as-stacks:
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