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(a, b) would make more sense if then. Jokes aside, + also quite break the reading flows of the string such as

user_name + ": " + attr1 + "| " + attr2 + "\n"

is more difficult to parse by eyeball for me then

concat(user_name, ": ", attr1, "| ", attr2, "\n")

I mean sure, but the fact that you had to write 6 strings to illustrate this should tell you something, right?

This

  user_name + ": " + attr1

is easier to eyeball than

  concat(user_name, ": ", attr1)

To me they are similar though. I used Python quite a lot, for string concatenation, I mostly use fstrings. `+` is used mostly in the `+=` case.