[docs] [issue10225] Fix doctest runable examples in python manual

[Terry J. Reedy]

Terry J. Reedy added the comment:

For whatever difference it makes, the 3.x docs now *are* being built with 3.x.

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versions: +Python 3.4, Python 3.5 -Python 3.1, Python 3.2, Python 3.3

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue10225>
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