value = input("Enter value: ").strip().lower()

Enter value:  YES

def process_data():
    print("Processing data...")

def main():
    print("Initializing system...")
    process_data()

if __name__ == "__main__":
    main()

Initializing system...
Processing data...

def initialize():
    print("System initialized")

def run():
    print("Application running")

def shutdown():
    print("System shutdown")

def main():
    initialize()
    run()
    shutdown()

if __name__ == "__main__":
    main()

System initialized
Application running
System shutdown

def main():
    try:
        print("Executing task...")
    except Exception as e:
        print("Error occurred:", e)

if __name__ == "__main__":
    main()

Executing task...

def main(name):
    print(f"Welcome, {name}")

if __name__ == "__main__":
    main("Alice")

Welcome, Alice

class InvalidOrderStateError(Exception):
    """Raised when an order is in an invalid processing state"""
    pass

def process_order(status):
    if status != "confirmed":
        raise InvalidOrderStateError("Order must be confirmed before processing")

process_order("draft")

def main():
    """Application entry point"""
    print("Application started")

if __name__ == "__main__":
    main()

Application started

def main():
    print("Program started")

main()

Program started

def calculate_total(a, b):
    return a + b

def main():
    result = calculate_total(10, 20)
    print("Total:", result)

if __name__ == "__main__":
    main()

Total: 30

def main():
    print("Main function executed")

if __name__ == "__main__":
    main()

Main function executed