[Python-ideas] Let’s make escaping in f-literals impossible

[Philipp A.]

Hi Eric,

Very cool of you to get this going!

I hope the outcome is to ban escapes within braced code parts of f-literals
for 3.6 and add them “the right way” in 3.7: f'foo{ bar['\n'] }baz'

It really is how things work in every single language that i ever
encountered that has template literals / string interpolation / f-literals
/ whatchacallit, so in order to be logical and non-surprising, we should do
it that way (eventually).

Also the name “f-strings” is really misleading: They’re composite
expressions that evaluate to strings. They can only be considered
strings if you have no braced code parts in them. So I’m also still in
favor of renaming them (e.g. to “f-literals”).

Best, Philipp
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