Eric Snow <ericsnowcurren...@gmail.com> added the comment:

@antoine - I wondered about that.  In the end I got something up to start with.

The list of fields in sys.implementation may change over time, unlike 
sys.version_info, et al.  However, during interpreter execution, I would expect 
that neither that list nor the contents would change.  The variability would 
only be between implementations and between versions of those implementations.

A dict would imply to me that it might vary during interpreter execution.  An 
immutable type makes it clear to me that it won't be changing.  I'm fine with a 
dict, though, if you think that's better.  Perhaps a dictproxy?

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<http://bugs.python.org/issue14673>
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