[issue20683] Add example to tutorial namespace doc, section 9.2

[Terry J. Reedy]

Changes by Terry J. Reedy <tjreedy at udel.edu>:


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title: [doc] Ease comprehension of section 9.2 of docs for Python 2 and 3 with example -> Add example to tutorial namespace doc, section 9.2
versions: +Python 2.7, Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20683>
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