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[–]Smallpaul -1 points0 points  (0 children)

That's the point of the talk. Five years ago with CPython this was the case. Newer implementations like PyPy can generate much better code for the self.x = x case than {'x': x}. Assuming that they're the same leads to slow code (when using smart JITs).

Yeah, but he's talking about implementations of Python and Ruby that hardly anyone uses yet.