More flexible f-string parsing sounds like a mistake. The basic use case is fine:
f"Hello, {name}, how are you?"
But putting entire expressions in there sounds like going too far. So now you can do this:
f" something { my_dict["key"] } something else "
But why not the simpler approach (this is simper to read for both humans and machines):
value = my_dict["key"]
f" something {value} something else "
Heck, even this monstrosity is allowed:
f"{f"{f"{f"{f"{f"{1+1}"}"}"}"}"}"
From TFA (emphasis mine):
> Expression components inside f-strings can now be any valid Python expression including backslashes, unicode escaped sequences, *multi-line expressions*, comments and strings reusing the same quote as the containing f-string.
Edit: I do appreciate that at least the parser will give out detailed error messages when something is wrong in a f-string.
> Expression components inside f-strings can now be any valid Python expression including backslashes, unicode escaped sequences, *multi-line expressions*, comments and strings reusing the same quote as the containing f-string.
Edit: I do appreciate that at least the parser will give out detailed error messages when something is wrong in a f-string.