which is best for a singleton, module or class?

[Peter Bismuti]

What is best for a singleton, making it a module or a class within a module?
I guess the reason why having a class within a module undesirable is that it
adds to the namespace of the object mymodule.mclass.property instead of
mymodule.property, and so fourth.  I know you can import it in a way to
reduce the path length of the object, but still, it seems like a cleaner
coding style to just use the module itself.   Opinions? THanks.