[issue18901] sunau.getparams should return a namedtuple

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


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nosy: +r.david.murray
stage:  -> patch review
type:  -> enhancement

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18901>
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