Could someone explain what this does and how ?

Question

s="string"
s= s[:1] + s[1:]

Answer 1

[start : end : step]
is the pythonic way of slicing strings , lists, etc...

[:1] = [0:1:1]
[1:] = [1:end:1]

In your given code
it does nothing just slice and join it back to the same thing
s[:1] = "s"
s[1:] = "tring"
s = "s" + "tring"

it works same as it works on lists 👇
https://www.sololearn.com/learn/JUMP_LINK__&&__Python__&&__JUMP_LINK/2453/?ref=app

Answer 2

Thanks