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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 2e2e7f398864 by Ezio Melotti in branch '2.7':
#16470: mention set and dict comprehension in the tutorial.  Patch by Yongzhi Pan.
http://hg.python.org/cpython/rev/2e2e7f398864

----------
nosy: +python-dev

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16470>
_______________________________________