Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:

It is present in union and intersection because chained operations are 
reasonably common.  I don't think it makes much sense in the constructors 
because it doesn't correspond to how people think of (make this a set).

----------
assignee:  -> rhettinger
nosy: +rhettinger
priority: normal -> low

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue13972>
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