[issue3976] pprint._safe_repr is not general enough in one instance

[Alexander Belopolsky]

Alexander Belopolsky <belopolsky at users.sourceforge.net> added the comment:

The proposed patch appears to give up sorting by key,value altogether if 
there are a few incomparable items.  It would be better to group items by 
type and sort within each group.  For example, 
pprint({1:1,2:2,A():3,A():4}) should print int:int items in order.

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nosy: +belopolsky

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue3976>
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