[issue20310] Recommend using pprint for deterministic doctest

[R. David Murray]

R. David Murray added the comment:

I think suggesting pprint is a great idea.  It also has another advantage in 3.4: in many cases it should produce output that is line wrapped such that NORMALIZE_WHITESPACE isn't needed.

However, I'd make it as an *additional* suggestion.  Pedagogically, sort makes it clear that you *must* resolve the problem of the ordering of dict items...then you can suggest pprint as something that also sorts, and has some additional nice properties as well.

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nosy: +r.david.murray

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