[issue18533] Avoid error from repr() of recursive dictview

[Ben North]

Ben North added the comment:

I'll attach fresh patches, one against latest 2.7 and one against
latest 3.3 (unchanged apart from headers from previous patch).

Both branches pass

    ./python -m test.regrtest -R20:30 test_dictviews

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18533>
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