`str.join(str(i) for i in value)` for `f-strings`

Ideas
3

perhaps, given the dynamic typing, it will be problematic to apply the format for each, so for now I suggest only concatenating them together.

But something like this, of course, is not ideal, but it will work.

class Iterable:
    def __format__(self, fmt):
        concat, *fmts = fmt.split('|')
        def _format(el) -> str:
            for opt in fmts:
                try: return format(el, opt)
                except TypeError: pass
            return str(el)
        return concat.join(map(_format, self))

print(f'{some_iter:, |0.f|d}')