[Stephen J. Turnbull]
Is this syntax useful? Or is it just a variant of purity trying to
escape Pandora's virtualbox? I mean, am I going to see it often
enough to get used to it? Or am I going to WTF at it for the rest of
my life?
I don't know about the line breaks, but in recent weeks I've found myself more than once having to remind myself that inside interpolations, you must use the other type of quote. Things like
print(f"{source.removesuffix(".py")}.c: $(srcdir)/{source}")
Learning that inside {} you can write any expression is easy (it's a real Aha! moment -- that's the power of f-strings). Remembering that you have to switch up the quote characters there is hard -- it doesn't occur very often, and the reason is obscure. By the time my mental parser has made it to the argument list of removesuffix() it has already forgotten that it's inside an f-string and my fingers just reach for my favorite quote character.
And the error isn't really helping either:
```
>>> print(f"{source.removesuffix(".py")}.c: $(srcdir)/{source}")
File "<stdin>", line 1
print(f"{source.removesuffix(".py")}.c: $(srcdir)/{source}")
^
SyntaxError: f-string: unmatched '('
```