[issue30031] Improve queens demo (use argparse and singular form)

[Louie Lu]

Louie Lu added the comment:

I make some review at GitHub.

Do David and Terry suggest to also fix the problem about PEP8 coding style, since this demo have many places didn't fit PEP8.

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nosy: +louielu

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<http://bugs.python.org/issue30031>
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