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> Calling it from the empty string concatenates the pieces with no separator, which is a Python quirk and rather surprising at first.

This is stated twice, but I can't make any sense of it. How is this even remotely surprising? What else would anyone possibly expect joining with the empty string as the separator to do?

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The surprising thing is that .join is a method of the separator, not of the list of pieces.

I'm pretty sure it's a string method so it can take any iterator as an argument.

I think that was the deciding argument, yes.

I think he's referring to backwards nature of string joining in general.

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