Serhiy Storchaka added the comment:
The core of the problem is in Set.
import collections.abc
class S(collections.abc.Set):
def __contains__(self, key): return False
def __iter__(self): return iter(())
def __len__(self): return 0
S() < set() is False.
set() < S() fails.
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<http://bugs.python.org/issue16373>
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