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

[Yongzhi Pan]

Yongzhi Pan added the comment:

I updated the patch according to the code review. Hope now it is OK.

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Added file: http://bugs.python.org/file27995/set_and_dict_comprehensions_1.diff

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<http://bugs.python.org/issue16470>
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