[issue22823] Use set literals instead of creating a set from a list

[Raymond Hettinger]

Raymond Hettinger added the comment:

Attaching a patch.  Doesn't change tests for the reasons mentioned above.  
Leaves idle, 2-to-3, and mocking for their respective module maintainers to deal with holistically (as part of their routine maintenance).

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keywords: +patch
Added file: http://bugs.python.org/file37159/set_literal.patch

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