event-queue-system.py

"""
Event Queue System

This program manages an event queue.
It allows users to:
- Add a new event
- Process the next event in the queue
- Display all pending events
- Cancel a specific event
- Exit the system
"""

# List to store events
event_queue = []

# Function to add a new event
def add_event(event):
    event_queue.append(event)
    print(f"Event '{event}' added to the queue.")

# Function to process the next event
def process_next_event():
    if event_queue:
        event = event_queue.pop(0)
        print(f"Processed event: '{event}'")
    else:
        print("No events to process.")

# Function to display all pending events
def display_pending_events():
    if event_queue:
        print("Pending Events:")
        for idx, event in enumerate(event_queue, 1):
            print(f"{idx}. {event}")
    else:
        print("No pending events.")

# Function to cancel a specific event
def cancel_event(event_name):
    if event_name in event_queue:
        event_queue.remove(event_name)
        print(f"Event '{event_name}' has been canceled.")
    else:
        print(f"Event '{event_name}' not found or already processed.")

# Main program loop
while True:
    print("\nEVENT MENU")
    print("1. Add Event")
    print("2. Process Next Event")
    print("3. Display Pending Events")
    print("4. Cancel an Event")
    print("5. Exit")

    try:
        choice = int(input("Enter your choice: "))
        if choice < 1 or choice > 5:
            print("Please choose a number between 1 and 5.")
            continue
    except ValueError:
        print("Invalid input. Please enter a number.")
        continue

    if choice == 1:
        event = input("Enter event name: ")
        add_event(event)
    elif choice == 2:
        process_next_event()
    elif choice == 3:
        display_pending_events()
    elif choice == 4:
        event_name = input("Enter event name to cancel: ")
        cancel_event(event_name)
    elif choice == 5:
        print("Exiting event processing system.")
        break