Message7680

OK, I found a much simpler demonstration of this problem while trying to figure out why test_pprint wasn't working.

Python 2.7.3 (default, Aug  1 2012, 05:14:39) 
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> x = frozenset([frozenset([1,2]), frozenset([3,4])])
>>> sorted(x)
[frozenset([1, 2]), frozenset([3, 4])]

Jython 2.7b1 (default:d77503b7a755+, Feb 8 2013, 17:23:40) 
[OpenJDK 64-Bit Server VM (Oracle Corporation)] on java1.7.0_09
Type "help", "copyright", "credits" or "license" for more information.
>>> x = frozenset([frozenset([1,2]), frozenset([3,4])])
>>> sorted(x)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: cannot compare sets using cmp()