Comment #5 on issue 2689 by smi...@gmail.com: Set and Dict args should be
sorted
http://code.google.com/p/sympy/issues/detail?id=2689
OK, now it's working. I wanted to have the multiset_partitions to be
turned into a set to show only the unique permutations:
>>> from sympy.utilities.iterables import *
>>> m=list(multiset_partitions([1,1,2],2))
>>> m
[[[1, 1], [2]], [[1], [1, 2]], [[1, 2], [1]]]
>>> mdict = [Dict(*[(g[0], len(g)) for g in group(j)]) for j in li
for li in m]
>>> mdict
[{1: 1, 2: 1}, {1: 1, 2: 1}, {1: 1, 2: 1}, {1: 1}, {1: 1}, {1: 1}]
>>> Tuple(*[Set(*m_dict) for li in m])
(Set({1: 2}, {2: 1}), Set({1: 1}, {1: 1, 2: 1}), Set({1: 1}, {1: 1, 2:
1}))
>>> set(_)
set([Set({1: 1}, {1: 1, 2: 1}), Set({1: 2}, {2: 1})])
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