Yongzhi Pan added the comment:
I think metal means that the different ways set is repr'd in 2.7 and 3.
In 2.7:
In [9]: a = {x for x in 'abracadabra' if x not in 'abc'}
In [10]: repr(a)
Out[10]: "set(['r', 'd'])"
In 3.2：
In [6]: a = {x for x in 'abracadabra' if x not in 'abc'}
In [7]: repr(a)
Out[7]: "{'r', 'd'}"
We were saying not changing __repr__ in #2335.
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<http://bugs.python.org/issue2333>
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