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

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

OK, test_dictviews and test_ordered_dict now pass for me, and Appveyor already ran entire suite and says OK to all.

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