Union syntax

Union syntax(I’m trying to do this as a quick post in response to some questions I received on this topic. I realize this will probably reopen the whole discussion about the best syntax for types, but sorry folks, PEP 484 was accepted nearly a year ago, after many months of discussions and hundreds of messages. It’s unlikely that any idea you can think of here would be new. This post just explains the rationale of one particular decision and tries to put it in some context.)I’ve heard some grumbling about the union syntax in PEP 484: Union[X, Y, Z] (where

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