Replace f-strings with regular strings

[KAction]

Often as result of refactoring I end up with f-string with no
{substitutions}, and my editor (integrated with flake8) keeps
reminding me about it.

With some stretch one can argue that this is actually formatting issue
and as such within scope of black(1). Would you be interested in patch
that implement this proposal?

print(f"Hello")

to become

print("Hello")

[JelleZijlstra]

Preview mode does this in some cases but not here. I agree that it's worthwhile, although it does change Python's AST.

[PBNMH22]

Hi I am new to this, I was searching for this but the code base is huge.
Request you to please navigate me to desired file or folder.
I will try my best.

[KAction]

I think it is as simple as dropping drop_useless_fstring conditional. I'd like to grab lock on this issue for coming 72 hours. I'll do my best to come with PR within this timeframe.

[JelleZijlstra]

@graingert (responding to your comment on #3087, where I'd like the focus to stay on the broader propsal). This does change the AST:

>>> ast.dump(ast.parse('f"x"'))
"Module(body=[Expr(value=JoinedStr(values=[Constant(value='x')]))], type_ignores=[])"
>>> ast.dump(ast.parse('"x"'))
"Module(body=[Expr(value=Constant(value='x'))], type_ignores=[])"

[JelleZijlstra]

Duplicate of #1156