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Format string is very inconvenient approach because you need to duplicate type information.

>>> '%i' % 's' Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: %i format: a number is required, not str >>> '{}'.format('s') 's' >>> '{}'.format(10) '10'

javascript, python, rust, etc. don't use printf style, but instead use the {} style.

Yeah, well Rust isn't exactly a success story in that regard if you ask me. A couple of weeks ago I tried to figure out how to format a float properly in Rust, and the way they made it work is a lot worse than straight up printf-style if you ask me.