Usando try

try.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

try:
    from time import sleep
except ImportError:
    from time import sleep

try:
    cont = 100
    while cont <= 200:
        print(f'{cont}', end=' ', flush=True)
        sleep(0.5)
        cont += 1
except KeyboardInterrupt as err:
    print(err)