#!/usr/bin/env python3
import sys, time

def main():
    arg = sys.argv[1] if len(sys.argv) > 1 else "world"
    print(f"[python] hello, {arg}", flush=True)

    for i in range(1, 11):
        print(f"[python] step {i}/10 …", flush=True)
        time.sleep(0.6)

    print("[python] all done ✅", flush=True)

if __name__ == "__main__":
    main()