todo.py

tasks=[]

def add_task():
    t=input("Enter the task: ")
    tasks.append(t)

def show_task():
    n=1
    print("Tasks: ")
    for i in tasks:
        print(n,".",i)
        n=n+1

def delete_task():
    de = input("Enter the task that has to be deleted: ")
    if de in tasks:
        tasks.remove(de)
    else:
        print("Task doesn't exist")

while(True):

    
    print("1.Add task\n")
    print("2.Show task\n")
    print("3.Delete task\n")
    print("4.Exit")

    ch=int(input("Enter the choice: "))

    if ch==1:
        add_task()
    elif ch==2:
        show_task()
    elif ch==3:
        delete_task()
    elif ch==4:
        print("Bye!")
        break
    else:
        print("Invalid choice")