script.py

import argparse
import random
import time


def random_values(failing: bool = False):
    for i in range(10):
        print(f"Value {i+1}")
        time.sleep(random.uniform(0, 1))
        if failing and i == 5:
            raise ValueError("Failing!!")


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument("--failing", action="store_true")
    args = parser.parse_args()
    random_values(args.failing)


main()