Format strings vs concatenation

Question

I see many people using format strings like this:

root = \"sample\"
output = \"output\"
path = \"{}/{}\".format(root, output)

Instead of si

Answer 1

It's not just for "looks", or for powerful lexical type conversions; it's also a must for internationalisation.

You can swap out the format string depending on what language is selected.

With a long line of string concatenations baked into the source code, this becomes effectively impossible to do properly.