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

As with most things, there will be a performance difference, but ask yourself "Does it really matter if this is ns faster?". The root + '/' output method is quick and easy to type out. But this can get hard to read real quick when you have multiple variables to print out

foo = "X = " + myX + " | Y = " + someY + " Z = " + Z.toString()

vs

foo = "X = {} | Y= {} | Z = {}".format(myX, someY, Z.toString())

Which is easier to understand what is going on? Unless you really need to eak out performance, chose the way that will be easiest for people to read and understand