Blocked revisions 77400,77422,77428 via svnmerge

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  r77400 | alexandre.vassalotti | 2010-01-09 18:35:54 -0500 (Sat, 09 Jan 2010) | 2 lines

  Issue #2335: Backport set literals syntax from Python 3.x.
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  r77422 | alexandre.vassalotti | 2010-01-11 17:36:12 -0500 (Mon, 11 Jan 2010) | 2 lines

  Issue #2333: Backport set and dict comprehensions syntax.
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  r77428 | alexandre.vassalotti | 2010-01-11 18:17:10 -0500 (Mon, 11 Jan 2010) | 2 lines

  Issue #1967: Backport dictionary views.
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