How to pick random cars in python from txt file

i've came across this problem that i've been trying to solve: i want to use a txt to randomly pick a car from a txt file but i always get it wrong and i hoped that you could help me here is what i have done so far in this specific part:

import random

if user_input == "1":

  with open("cars.txt", "r") as call_uber:

      for line in call_uber:

          array1 = line.split(" : ")

          print(array1)

the objective is to randomly pick the first name of one of the txt file lines but i just managed to split them

ps: i'm a newbie at this.