[issue4285] Use a named tuple for sys.version_info

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

Rather than deleting the isinstance() check from the tests completely, I
suggest changing it to be:

self.assert_(isinstance(vi[:], tuple))

Also, comparing directly with a tuple is also a fairly common use of
version_info so it would be worth adding a test to explicitly guarantee
that comparison:

self.assert_(vi > (1,0,0))

Patch applied and built cleanly for me, but I haven't checked the doc
build yet.

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nosy: +ncoghlan

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