[issue14673] add sys.implementation

[Eric Snow]

Eric Snow <ericsnowcurrently at gmail.com> added the comment:

This patch incorporates types.SimpleNamespace and makes the repr show all attributes.  Tests and docs for types.SimpleNamespace are also included.

The patch skips 3 tests (which I added) that are failing.  One has a segfault due to a recursive repr (where I had a hunch that something funny would happen).  One is a situation that I mentioned earlier in this ticket.  However, the third one was entiredly unexpected.

None of these pathologies impact sys.implementation.  I will be working on fixing them regardless.  If you want to wait until I fix the corner cases, I'm fine with that.  However, the patch should be good to go as far as sys.implementation is concerned.

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Added file: http://bugs.python.org/file25779/issue14673_full.diff

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