[issue29405] improve csv.Sniffer().sniff() behavior

[Berker Peksag]

Berker Peksag added the comment:

> [...] but I want to make the change small so others won't get unfamiliar with the new code. :-)

Assuming it doesn't cause any behavior changes, I find Milt's patch simple enough and easier to understand than the version uses 'iteration' variable.

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nosy: +berker.peksag

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<http://bugs.python.org/issue29405>
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