I didn't even realize f'{n for n in row}' was already valid syntax. Since
generator expressions can usually only appear within parentheses, I assumed the
syntax wouldn't conflict with anything because you would need to parenthesize
the generator to make it work. Anyway, now I see that the better option is to
leave the interpolation as-is but introduce a conversion flag that can unroll
any iterable, so the current behavior actually works in our favor here. This
would indeed be more powerful than any specialized comprehension syntax.
print(''.join(f'{n:>8.3f}' for n in row) + f' | {sum(row):>8.3f}')
print(f'{row!u:>8.3f} | {sum(row):>8.3f}')
Now the second option is even more attractive in my opinion. I'm using !u for
"unroll". The good news is that implementing a conversion flag is a much less
intrusive change.
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