I don't actually know how viable this proposal is, but given that it's being debated at some length, I'd like to put in my opinion that *if* we're going to define an operator that's (roughly) synonymous with issubclass(), it should be '<:', which is used in other languages (e.g. Scala) and notational systems (https://en.wikipedia.org/wiki/Subtyping). Overloading '<=' would be easier to implement, but would also cause enough confusion that I think we should avoid it at all cost.
-- --Guido van Rossum (python.org/~guido) *Pronouns: he/him/his **(why is my pronoun here?)* <http://feministing.com/2015/02/03/how-using-they-as-a-singular-pronoun-can-change-the-world/>
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