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

[STINNER Victor]

STINNER Victor added the comment:

> Here is a patch for lib2to3.

In Python 3.5, I still found some "set([" and "frozenset([" in Lib/lib2to3, Lib/test/, Lib/stringrep.py, Lib/unittest/test/ and Lib/idlelib/CodeContext.py if someone is motived to patch them. (Ok, Serhiy wrote a patch for lib2to3.)

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nosy: +haypo

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<http://bugs.python.org/issue22823>
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