tkinter checkbutton if checked

[MC2020]

Hi - I am learning python and need help with this code. I have researched online, but haven't been able to find an answer for what I'm looking for.

My code is below. The 'open' function is what I need help with. I am looking to add the fooditem selected to the newwindow if the checkbox is checked. My code is below but isn't working. Can someone help point me in the right direction?

fooditems = ['pizza','breadsticks','wings','CocaCola','brownie']
fooditems2 = []
price = ['15', '5', '10', '3', '2']
quantity = ['1','2','3','4']

import tkinter as tk
from tkinter import *
from tkinter import ttk

menu = Tk()
menu.geometry('500x300')

combobox = ttk.Combobox(menu, values=quantity)

def Open():
    New_Window = Tk()
    New_Window.geometry('500x300')
    calculateButton = tk.Button(New_Window, text = 'calculate')
    calculateButton.place(x=250,y=250)
    for x in range(len(fooditems)):
        if Checkbutton.get(x) == 1:
            fooditems2.append[x]
    fooditems2.grid(column=0, row=x)
    combobox.grid(column=15, row=x)
    New_Window.mainloop()


for x in range(len(fooditems)):
    a = Checkbutton(menu, text="", variable=fooditems[x], onvalue = 1, offvalue = 0)
    b = Label(menu, text=fooditems[x])
    a.grid(column=0, row=x)
    b.grid(column=5, row=x)
    
    

confirmButton = tk.Button(menu, text = 'Confirm', command=Open)
confirmButton.place(x=250,y=250)

menu.mainloop()

[woooee]

Don't use 2 instances of Tk() as the results are unpredictable. Use a Toplevel instead.

My code is below but isn't working

What does this mean?

[joe_momma]

one major issue with your code is it's not a class. here's a checkbox

import tkinter as tk
 
 
class MainFrame(tk.Frame):
 
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.vars=[]
        self.checkbuttons = {'pizza': tk.IntVar(),
                             'salad': tk.IntVar(),
                             'coffee': tk.IntVar()}
         
        for key, value in self.checkbuttons.items():
            ctrl = tk.Checkbutton(self, text=key, variable=value)
            ctrl.pack()
            self.vars.append(value)
         
        self.button = tk.Button(self, text='Checkbutton values',
                                command=self.on_button)
        
        self.button.pack(pady=5,padx=10)
        self.pack()
 
    def on_button(self):
        res= []
        for key, val in self.checkbuttons.items():
           select= val.get()
           if select:
                print(f'you selected {key}')
        
 
 
if __name__ == '__main__':
    app = tk.Tk()
    main_frame = MainFrame()
    app.mainloop()