printf-style formatting ("foo %s" % "bar") feels the most ready to be retired (except insofar as it probably never will, because it's a nice shortcut). The oth

printf-style formatting ("foo %s" % "bar") feels the most ready to be retired (except insofar as it probably never will, because it's a nice shortcut). The other ones at least are based on the same format string syntax. "foo {}".format("bar") would be an obvious "just use f-string" case, except when the formatting happens far off. But in that case you could "just" use t-strings? Except in cases where you're (for example) reading a format string from a file. Remember, t- and f- strings are syntactic elements, so dynamism prevents usage of it! So you have the following use cases: - printf-style formatting: some C-style string formatting is needed - .format: You can't use an f- string because of non-locality in data to format, and you can't use a t- string due to dynamism in - f-string: you have the template and the data in the same spot lexicographically, and you just want string concatenation (very common!) - t-string: you have the template and the data in the same spot lexicogrpahically, but want to use special logic to actually build up your resulting value (which might not even be a string!) The last two additions being syntax makes it hard to use them to cover all use cases of the first two. But in a specific use case? It's very likely that there is an exact best answer amongst these 4.