Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:
Syntax of format strings cannot be the same as in f-strings. {0} means the
first positional argument in format string an integer literal 0 in f-string.
{a[x]} means the value of literal string key "x" of keyword argument a in
format string, and indexing variable a with variable index/key x in f-string.
Such things as {if}, {+.name} or {0[-]} are not even valid in f-strings.
Since we cannot get rid of all differences between format strings and
f-strings, I do not think that this one change is worth. It will only make
differences more complex. Not mentioning that it is a compatibility breaking
change, and can break user code.
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nosy: +serhiy.storchaka
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<https://bugs.python.org/issue44355>
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