Codewars Kata - Testing 1-2-3

DESCRIPTION:
Your team is writing a fancy new text editor and you've been tasked with implementing the line numbering.

Write a function which takes a list of strings and returns each line prepended by the correct number.

The numbering starts at 1. The format is n: string. Notice the colon and space in between.

Examples: (Input --> Output)

[] --> []
["a", "b", "c"] --> ["1: a", "2: b", "3: c"]

def number( lines ):
    return [ f"{ i + 1 }: {lines[i]}" for i in range( len( lines ) ) ]