[docs] [issue16470] Backport set and dictionary comprehensions in tutorial to 2.7

[Éric Araujo]

Éric Araujo added the comment:

Good idea.  Could you add a note that this is new in 2.7?  (Either using versionadded Sphinx directives or just remarks in plain English, not sure which one would be best.)

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nosy: +eric.araujo

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