This code does not clear between functions, and the menu display is repetitive. Display menu must remain and not repeat. Then in the check and delete function, the enter index should be displayed after displaying the list.

import json

 

import os

import time

todo$\_$list $=[]$

completed$\_$tasks $=$ set$()$

def clear$\_$screen$()$:

os$.$system$("$cls$"$ if os$.$name $=="$nt$"$ else "clear"$)$

def display$\_$menu$()$:

clear$\_$screen$()$

print$("***********")$

print$("$Todoify$")$

print$("-----------")$

print$("$list $$ List todos"$)$

print$("$add $$ Add todo"$)$

print$("$check $$ Check todo"$)$

print$("$delete $$ Delete todo"$)$

print$("$save $$ Save todos to file"$)$

print$("$load $$ Load from file"$)$

print$("------------------")$

def display$\_$todo$\_$list$()$:

unique$\_$todo$\_$list $=$ list$($set$($todo$\_$list$))$ # Remove duplicates

if not unique$\_$todo$\_$list:

print$("$No tasks in the to$-$do list."$)$

else:

for i$,$ task$\_$item in enumerate$($unique$\_$todo$\_$list$)$:

checkbox $="[$x$]"$ if i in completed$\_$tasks else $"[]"$

print$($f$"\{$checkbox$\}\{$task$\_$item$\}")$

input$("$Press enter to continue..."$)$

def add$\_$task$($task$\_$item$)$:

todo$\_$list.append$($task$\_$item$)$

print$("$SUCCESS: Todo added"$)$

input$("$Press enter to continue..."$)$

def check$\_$task$($task$\_$index$\_$to$\_$check$)$:

if $1<=$ task$\_$index$\_$to$\_$check $<=$ len$($todo$\_$list$)$:

if task$\_$index$\_$to$\_$check $-1$ not in completed$\_$tasks:

print$("$SUCCESS: UNCHECKED $->$ CHECKED"$)$

completed$\_$tasks.add$($task$\_$index$\_$to$\_$check $-1)$

else:

print$("$Task already checked."$)$

time.sleep$(2)$

else:

print$("$Invalid task index."$)$

input$("$Press enter to continue..."$)$

def delete$\_$task$($task$\_$index$\_$to$\_$delete$)$:

if $1<=$ task$\_$index$\_$to$\_$delete $<=$ len$($todo$\_$list$)$:

deleted$\_$task $=$ todo$\_$list.pop$($task$\_$index$\_$to$\_$delete $-1)$

print$($f$"$SUCCESS: Todo $\text{'}\{$deleted$\_$task$\}\text{'}$ deleted from the to$-$do list."$)$

print$("---------------------")$

display$\_$todo$\_$list$()$ # Display remaining todos

else:

print$("$Invalid task index."$)$

input$("$Press enter to continue..."$)$

def save$\_$to$\_$file$()$:

with open$("$todo$\_$list.json", $"$w$")$ as file:

json.dump$($todo$\_$list, file$)$

print$("$SUCCESS: To$-$do list saved to file"$)$

print$("$INFO: This web demo does not actually support saving todos to file."$)$

input$("$Press enter to continue..."$)$

def load$\_$from$\_$file$()$:

global todo$\_$list

try:

with open$("$todo$\_$list.json", $"$r$")$ as file:

todo$\_$list $=$ json.load$($file$)$

except FileNotFoundError:

pass

print$("$SUCCESS: To$-$do list loaded from file"$)$

print$("$INFO: This web demo does not actually support loading of todos."$)$

input$("$Press enter to continue..."$)$

# Initial display menu

display$\_$menu$()$

while True:

display$\_$menu$()$

choice $=$ input$("$Selection $>")$

# Print separator line below the user makes a selection

print$("-------------------------")$

if choice $==$ "list":

display$\_$todo$\_$list$()$

elif choice $==$ "add":

task $=$ input$("$Todo description $>")$

add$\_$task$($task$)$

elif choice $==$ "check":

task$\_$index $=$ int$($input$("$Enter the task index to check: $"))$

check$\_$task$($task$\_$index$)$

elif choice $==$ "delete":

task$\_$index $=$ int$($input$("$Enter the task index to delete: $"))$

delete$\_$task$($task$\_$index$)$

elif choice $==$ "save":

save$\_$to$\_$file$()$

elif choice $==$ "load":

load$\_$from$\_$file$()$

elif choice $==$ "exit":

print$("$Exiting$...")$

break

else:

print$("$Invalid choice. Please enter a valid command."$)$

input$("$Press enter to continue..."$)$

# Print separator line under the user makes a selection

print$("-------------------------")$