[issue21545] Tutorial: examples and comment about mutation methods

[Roundup Robot]

Roundup Robot added the comment:

New changeset 6fc09f30b514 by Terry Jan Reedy in branch '2.7':
Issue #21545: Add .pop example and tweak comment about pure mutation methods.
http://hg.python.org/cpython/rev/6fc09f30b514

New changeset 3f2b6034b73a by Terry Jan Reedy in branch '3.4':
Issue #21545: Add .pop example and tweak comment about pure mutation methods.
http://hg.python.org/cpython/rev/3f2b6034b73a

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nosy: +python-dev

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