Yes/No checkbutton for bool attribute in a GUI to manage a list of objects

For this gui I have five objects: Full name, Contact info, Desired Language, Difficulty level, and Experience with the language. My design for this assignment is that it's a simple 'Foreign Language Bookstore Request Manager' in which I can add, edit and delete requests for foreign language books.

I want the first four objects to be Entry fields and then the fifth (experience) to be a checkbox, for this data attribute I want to make it a bool representing yes/no state for the question of whether one has experience with the language they are requesting.

From my textbook and previous examples I was able to make a basic y/n checkbox, however it appears at the top of my window and I am stuck on how to write it so that the experience data attribute is a check button for the bool attribute rather than an Entry form and that whatever is selected (yes or no/whether it is true or false) appears when I use a str method to display each attribute's value using ListboxSelect.

When I have tried to separate the fifth attribute from the rest so that it is a checkbox rather than Entry form, I cannot run my program, and in trying to create the bool attribute I ran into errors as well and was unsure whether I need to fix the bool attribute first or the checkbox, whether they go hand in hand, etc

My questions are: 1) Am I using the correct formatting to create the y/n checkbox for the bool attribute? 2) How do I write the checkbox so that it appears next to the experience label and is not an Entry form as it is currently written?

I apologize if this is woefully stupid to ask, however I have spent 7 hours trying to troubleshoot these issues and haven't figured out what I am doing wrong and how to correct and add what is necessary to round out this program.

Unrelated to the check button, with the ListboxSelect widget, it is showing the object at the address I am looking for, but not actually displaying what I had thought I had written which would show: 'Full Name: , Contact info: , Language: , Difficulty: , Experience with language: (then here would be the answer to the checkbox for the boolean attribute which I haven't figured out yet)' in the Book Requests section of my program. I am including a picture of my program and current problems as well as some of the code. does not display what I had thought I had written

import tkinter import request

class Application: def init(self): self.__requests = [] self.__selected_index = 0 self.__selected_request = None

    self.__window = tkinter.Tk()
    self.__window.title('Foreign Language Bookstore Request Manager')

    self.__full_name = tkinter.StringVar()
    self.__contact_info = tkinter.StringVar()
    self.__language = tkinter.StringVar()
    self.__difficulty = tkinter.StringVar()
    self.__experience = tkinter.StringVar()

    self.cb_var1 = tkinter.IntVar()
    self.cb_var2 = tkinter.IntVar()

    self.cb_var1.set(0)
    self.cb_var2.set(0)

    self.cb1 = tkinter.Checkbutton(self.__window, \
                                   text='Yes', variable=self.cb_var1)
    self.cb2 = tkinter.Checkbutton(self.__window, \
                                   text='No', variable=self.cb_var2)

    self.cb1.pack()
    self.cb2.pack()



    self.build_input_frame('Full Name: ', self.__full_name)
    self.build_input_frame('Contact info (phone, email): ', self.__contact_info)
    self.build_input_frame('Desired language: ', self.__language)
    self.build_input_frame('Difficulty level 1- beginner, 2- intermediate, 3- advanced: ', self.__difficulty)
    self.build_input_frame('Experience with language? ', self.__experience)

    frame = tkinter.Frame(self.__window)
    self.__add_button = tkinter.Button(frame, text='Add Request',
        anchor=tkinter.W, command=self.add_request)
    self.__add_button.pack(side='left')
    self.__save_button = tkinter.Button(frame, text='Save Request',
        anchor=tkinter.W, command=self.save_request, state=tkinter.DISABLED)
    self.__save_button.pack(side='left')
    self.__delete_button = tkinter.Button(frame, text='Delete Request',
        anchor=tkinter.W,
        command=self.delete_request, state=tkinter.DISABLED)
    self.__delete_button.pack()
    frame.pack()

    frame = tkinter.Frame(self.__window)
    label = tkinter.Label(frame, text='Book Requests')
    self.__requests_list = tkinter.Listbox(frame, width=80,
        selectmode=tkinter.SINGLE)

    self.__requests_list.bind('<<ListboxSelect>>', self.select_request)
    label.pack()
    self.__requests_list.pack()
    frame.pack()

def build_input_frame(self, label, textvariable):
    """Build the top frames of the window for being able to enter data."""
    frame = tkinter.Frame(self.__window)
    label = tkinter.Label(frame, text=label, width=50, anchor=tkinter.W)
    entry = tkinter.Entry(frame, textvariable=textvariable, width=30)
    label.pack(side='left')
    entry.pack(side='right')
    frame.pack()

def add_request(self):
    """Get the values from the bound variables and create a new Request."""
    r = request.Request(self.__full_name.get(), self.__contact_info.get(),
        self.__language.get(), self.__difficulty.get(),
                        self.__experience.get())
    self.__requests.append(r)

    self.__requests_list.insert(tkinter.END, str(r))

def select_request(self, event):
    """Get the Request at the index selected, and set the Entry fields
       with its values."""
    # Get the current selection from the Listbox. curselection() returns
    # a tuple and we want the first item
    # Get the current selection from the Listbox. curselection() returns
    # a tuple and we want the first item
    current_selection = self.__requests_list.curselection()
    if current_selection:
        self.__selected_index = current_selection[0]

        # Grab the Request object from self.__request at that index
        self.__selected_request = self.__requests[self.__selected_index]

        # Use it's values to set the StringVars
        self.__full_name.set(self.__selected_request.get_full_name())
        self.__contact_info.set(self.__selected_request.get_contact_info())
        self.__language.set(self.__selected_request.get_language())
        self.__difficulty.set(self.__selected_request.get_difficulty())
        self.__experience.set(self.__selected_request.get_experience())

        # Make sure the Save button is enabled
        self.__save_button.config(state=tkinter.NORMAL)
        self.__delete_button.config(state=tkinter.NORMAL)


def delete_request(self):
    """Remov the Request at the index selected then set the Entry fields
       to empty values."""
    if 0 <= self.__selected_index < len(self.__requests):
        del self.__requests[self.__selected_index]
        self.__requests_list.delete(self.__selected_index)

        # Call the method to deselect the item, clear Entry fields, and
        # disable buttons.
        self.after_selected_operation()

def save_request(self):
    """Set the selected Request's fields and then persist its __str__
       representation to the Listbox."""
    self.__selected_request.set_full_name(self.__full_name.get())
    self.__selected_request.set_contact_info(self.__contact_info.get())
    self.__selected_request.set_language(self.__language.get())
    self.__selected_request.set_difficulty(self.__difficulty.get())
    self.__selected_request.set_experience(self.__experience.get())

    # Listbox widgets don't have a way of updating an item in place. So
    # We'll delete the item at a particular index and then add it
    self.__requests_list.delete(self.__selected_index)
    self.__requests_list.insert(self.__selected_index,
        str(self.__selected_request))

    # Call the method to deselect the item, clear Entry fields, and
    # disable buttons.
    self.after_selected_operation()

def after_selected_operation(self):
    """Clear the selected index, request, and disable buttons."""
    self.__selected_index = -1
    self.__selected_request = None

    self.__full_name.set('')
    self.__contact_info.set('')
    self.__language.set('')
    self.__difficulty.set('')
    self.__experience.set('')

    # Make sure the Save and Delete buttons are disabled
    self.__save_button.config(state=tkinter.DISABLED)
    self.__delete_button.config(state=tkinter.DISABLED)