>>> a.sort()
>>> a
[-1, 1, 66.25, 333, 333, 1234.5]
+ >>> a.pop()
+ 1234.5
+ >>> a
+ [-1, 1, 66.25, 333, 333]
You might have noticed that methods like ``insert``, ``remove`` or ``sort`` that
-modify the list have no return value printed -- they return ``None``. [1]_ This
-is a design principle for all mutable data structures in Python.
+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.
.. _tut-lists-as-stacks: