purpose of python typing code example

Example 1: python typing effect

from time import sleep
import sys

string = "The Battle Cats For Life" # Whatever string you want

for letter in string:
  sleep(0.01) # In seconds
  sys.stdout.write(letter)
  sys.stdout.flush()

Example 2: typing python

from collections.abc import Iterable

def zero_all_vars(vars: Iterable[LoggedVar[int]]) -> None:
    for var in vars:
        var.set(0)