FWIW, we could make f-strings properly nest too, like you are proposing for backticks. It's just that we'd have to change the lexer. But it would not be any harder than would be for backticks (since it would be the same algorithm), nor would it be backward incompatible. So this is not an argument for backticks.
Separately, should there be a way to *delay* evaluation of the templated expressions (like we explored in our private little prototype last year)? -- --Guido van Rossum (python.org/~guido) *Pronouns: he/him **(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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