I think most people who have tried f-strings have found them handy.
Could we transition to making default string literal into an
f-string? I think there is a smooth migration path.
f-strings without embedded expressions already compile to the same
bytecode as normal string literals. I.e. no overhead. The issue
will be literal strings that contain the f-string format characters.
We could add a future import, e.g.
from __future__ import fstring_literals
that would make all literal strings in the module into f-strings.
In some future release, we could warn about literal strings in
modules without the future import that contain f-string format
characters. Eventually, we can change the default.
To make migration easier, we can provide a source-to-source
translation tool. It is quite simple to do that using
the tokenizer module.
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