1+ # Define a class to represent a to-do list
12class ToDoList:
3+ # Initialize the ToDoList with an empty list of tasks
24 def __init__(self):
35 self.tasks = []
46
7+ # Add a task to the list
58 def add_task(self, task):
69 self.tasks.append(task)
710 print(f"Task '{task}' added successfully!")
811
12+ # Delete a task from the list if it exists
913 def delete_task(self, task):
1014 if task in self.tasks:
1115 self.tasks.remove(task)
1216 print(f"Task '{task}' deleted successfully!")
1317 else:
1418 print(f"Task '{task}' not found.")
1519
20+ # Mark a task as completed if it exists
1621 def mark_completed(self, task):
1722 if task in self.tasks:
1823 print(f"Task '{task}' marked as completed!")
1924 else:
2025 print(f"Task '{task}' not found.")
2126
27+ # Display all the tasks in the list
2228 def display_tasks(self):
2329 print("\nCurrent tasks:")
2430 for i, task in enumerate(self.tasks, start=1):
2531 print(f"{i}. {task}")
2632
33+ # Define the main function that will run the to-do list application
2734def main():
35+ # Create an instance of the ToDoList class
2836 todo = ToDoList()
2937
38+ # Loop to display the menu and process user input
3039 while True:
3140 print("\nMenu:")
3241 print("1. Add Task")
@@ -35,8 +44,10 @@ def main():
3544 print("4. Display Tasks")
3645 print("5. Exit")
3746
47+ # Get the user's choice
3848 choice = input("Enter your choice (1/2/3/4/5): ")
3949
50+ # Process the user's choice and call the appropriate method
4051 if choice == '1':
4152 task = input("Enter the task: ")
4253 todo.add_task(task)
@@ -49,10 +60,14 @@ def main():
4960 elif choice == '4':
5061 todo.display_tasks()
5162 elif choice == '5':
63+ # Exit the application
5264 print("Exiting the application. Have a great day!")
5365 break
5466 else:
67+ # Handle invalid choices
5568 print("Invalid choice. Please select a valid option.")
5669
70+ # Check if the script is being run directly and not imported
5771if __name__ == "__main__":
72+ # If the script is run directly, call the main function to start the application
5873 main()
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