That doesn't really work, both of the other systems date back literal decades. F-Strings were implemented in 2015 as a complete new thing, inspired by other lan

That doesn't really work, both of the other systems date back literal decades. F-Strings were implemented in 2015 as a complete new thing, inspired by other languages. In order to implement F-Stings, and due to limitations in the CPython language parser, F-Strings used to have a separate parser. Because of this there were restriction on what Python expressions could be embedded in an F-String. In 2020 CPython replaced is parser with a much more capable one. Now they are moving the F-String parsing to be part of the CPython parser proper, this is allowing them to lift many of the restrictions within F-Strings. "Formalising F-Strings" isn't a particularly good title, "Lifting the restrictions in F-String would be better".