Fixed #5636 -- Added missing Set import for Python2.3 support. Thanks, wangchun@exoweb.net.
Fixed #5636 -- Added missing Set import for Python2.3 support. Thanks, wangchun@exoweb.net.


git-svn-id: 4f9f921b081c523744c7bf24d959a0db39629563@6438 bcc190cf-cafb-0310-a4f2-bffc1f526a37

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