[issue10225] Fix doctest runable examples in python manual

[Alexander Belopolsky]

Alexander Belopolsky <belopolsky at users.sourceforge.net> added the comment:

> Please leave the deployed code for named tuple as-is.  Doctest may
> have issues with trailing whitespace, but that is doctest's problem,
> not named tuple's.

I am curious, what was the reason to add trailing whitespace in the named tuple template?

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<http://bugs.python.org/issue10225>
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