[issue4285] Use a named tuple for sys.version_info

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

> Eric Smith <eric at trueblade.com> added the comment:
> "... as a named tuple" works for me. I'll go with that. Thanks!

+1 

Remember, "named tuple" is a concept, not a class.  It is anything that
provides attribute access as an alternative to indexed access (see the
definition in the glossary where time.struct_time is given as an
example).  Running the collections.named_tuple() factory function
creates a new class with named tuple features, but it is just one of
several ways of creating named tuples.

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<http://bugs.python.org/issue4285>
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