lista.py

tasks = []

while True:
    print("\n1. shown\n2. add\n3. remove\n4. exit")
    choice = input("choose(1-4):")
    if choice == "1":
        print("tasks" if tasks else "No tasks")
        for i,t in enumerate (tasks,1):
            print (f'{i}.{t}')
    elif choice == "2":
        task = input ("New Task: ").strip()

        tasks.append(task)
    elif choice == "3":
        for i, t in enumerate(tasks, 1):
            print(f"{i}.{t}")
            try:
                idx = int(input("remove task #: "))
                if 1<= idx <= len(tasks):
                    tasks.pop(idx -1)
            except:
                print("Invalid Input.")
    elif choice == "4":
         break   
    else:
        print("invalid Choice.")