Ned Deily added the comment: Thanks for the report. Your example is of a set comprehension. Set and dictionary comprehensions were Python 3.1 features backported to Python 2.7 for compatibility and thus had no existing Python 2 compatibility concerns. If you try a similar example using list comprehensions, which have been around in Python 2 for a long time, you'll see there is a difference in behavior between Python 2 and 3, which is what under discussion in Issue5242.
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