Task Manager Application(homework)

tasks = []
next_sequence_number = 1

def add_task():
  global next_sequence_number
  task_name = input("Enter task name: ")
  
  # Find the next available sequence number
  sequence_number = next_sequence_number
  next_sequence_number +=1
  
  task = {
      "sequence_number": sequence_number,
      "task_name": task_name,
      "status": "Pending"
  }
  tasks.append(task)
  print(f"Task '{task_name}' added with sequence number {sequence_number}.")

def complete_task():
  sequence_number = int(input("Enter sequence number of task to complete: "))
  for task in tasks:
    if task["sequence_number"] == sequence_number:
      task["status"] = "Completed"
      print(f"Task '{task['task_name']}' marked as completed.")
      return
  print(f"Task with sequence number {sequence_number} not found.")

def delete_task():
  sequence_number = int(input("Enter sequence number of task to delete: "))
  for task in tasks:
    if task["sequence_number"] == sequence_number:
      task["status"] = "Deleted"
      print(f"Task '{task['task_name']}' deleted.")
      return
  print(f"Task with sequence number {sequence_number} not found.")

def list_completed_tasks():
  completed_tasks = [task for task in tasks if task["status"] == "Completed"]
  if completed_tasks:
    print("Completed Tasks:")
    for task in sorted(completed_tasks, key=lambda x: x["sequence_number"]):
      print(f"- {task['sequence_number']}: {task['task_name']}")
  else:
      print("No completed tasks found.")

def list_all_tasks():
  if tasks:
    print("All Tasks:")
    for task in sorted(tasks, key=lambda x: x["sequence_number"]):
        print(f"- {task['sequence_number']}: {task['task_name']} ({task['status']})")
  else:
    print("No tasks found.")

while True:
  print("\nTask Manager")
  print("1. Add Task")
  print("2. Complete Task")
  print("3. Delete Task")
  print("4. List Completed Tasks")
  print("5. List All Tasks")
  print("6. Exit")
  
  choice = input("Enter your choice: ")
  
  if choice == '1':
    add_task()
  elif choice == '2':
    complete_task()
  elif choice == '3':
    delete_task()
  elif choice == '4':
    list_completed_tasks()
  elif choice == '5':
    list_all_tasks()
  elif choice == '6':
    print("Exiting...")
    break
  else:
    print("Invalid choice. Please try again.")