Question

I'm making a To-Do list in Python 2 and had the program running before remembering that my professor wants me to put everything in procedures. I can't seem to get it to work the way I have it now and I can't figure it out. I commented out the lines that was originally in the working program and added procedures to the top. I've attached a screenshot of the error & pasted the code below.

1 todo_list = []
2 i = 0
3 count = 0
4
5 def menu():
6 print("[1] Add an item to the list\n[2] Delete an item from the list\n[3] Print the list\n[4] Print the list in reverse\n[5] Quit the program")
7 def add():
8 while(True):
9 addedItem = str(input("Please add an item to the To-Do List. Type 'done' when you have entered all items."))
10 if addedItem == 'done':
11 break
12 todo_list.append(addedItem)
13 i += 1
14 count += 1
15 def delete():
16 if(len(todo_list) == 0):
17 print("No items in todo_list. Please add items and then use option 2 to delete item.")
18 else:
19 deletedItem = str(input("Please enter the item you would like to delete."))
20 todo_list.remove(deletedItem)
21 print("Item " + str(deletedItem) + " has been deleted")
22 def printList():
23 print todo_list
24 def printReverse():
25 list.reverse(todo_list)
26 print todo_list
27
28
29 menu()
30 menu_option = int(input("Welcome to your To-Do List. Please choose and option to continue: "))
31
32 while menu_option != 5:
33 if menu_option == 1:
34 add()
35 #while(True):
36 # addedItem = str(input("Please add an item to the To-Do List. Type 'done' when you have entered all items."))
37 # if addedItem == 'done':
38 # break
39 #todo_list.append(addedItem)
40 #i += 1
41 #count += 1
42 elif menu_option == 2:
43 delete()
44 # if(len(todo_list) == 0):
45 # print("No items in todo_list. Please add items and then use option 2 to delete item.")
46 # else:
47 # deletedItem = str(input("Please enter the item you would like to delete."))
48 # todo_list.remove(deletedItem)
49 # print("Item " + str(deletedItem) + " has been deleted")
50 elif menu_option == 3:
51 printList()
52 # print todo_list
53 elif menu_option == 4:
54 printReverse()
55 # list.reverse(todo_list)
56 # print todo_list
57
58 menu()
59 menu_option = int(input("Welcome to your To-Do List. Please choose and option to continue: "))
60 print "Thank you for using your To-Do List!"

Compile Messages jGRASP Messages Run 1/0 Interactions End Welcome to your To-Do List. Please choose and option to continue: 1 Please add an item to the To-Do List. Type 'done' when you have entered all items. "shop" Clear Traceback (most recent call last): File "finalProgram2.py", line 34, in <module> Help add(). File "finalProgram2.py", line 13, in add i += 1 UnboundLocalError: local variable 'i' referenced before assignment ----jGRASP wedge: exit code for process is 1. ----jGRASP: operation complete. Line:35 Col:1 Code:32 Top:34 OV

Answer 1

Answer:


todo_list, i, count are global variables.
So, use below line in each of the functions (as first statement in functions) you defined.

global todo_list, i, count

Note: Please comment below if you have any doubts