python tkinter

import tkinter
from tkinter import *
from tkinter import messagebox
from tkinter import font
import time
import threading


root=Tk()

root.geometry("1200x500") #velichina prozora

top=Frame(root)  #podprozori
sat=Frame(root)
luk=Frame(root)

sat.grid(row=0, column=0)  #rasporedjujemo
top.grid(row=0, column=1)
luk.grid(row=0, column=2)

lb=Label(top, text="Narucite picu!", font=("Ariel", "20"))
lb.pack(side=TOP)


# lb.pack(side=TOP) //BOTTOM, LEFT, RIGHT
# lb.pack(anchor=N) //W,E,S... NW, NE, SW, SE, CENTER
# ako krenemo sa grid onda radimo grid, ako radimo pack onda sve sa pack u okviru prozora ili frame-a


v_ime=StringVar()
v_prezime=StringVar()
Label(top, text="Ime:").pack(side=TOP)
ime=Entry(top, textvariable=v_ime).pack(side=TOP)
Label(top, text="Prezime:").pack(side=TOP)
prezime=Entry(top, textvariable=v_prezime).pack(side=TOP)

Lb1=Listbox(top, selectmode=SINGLE)
Lb1.insert(0, "Vegetariana")
Lb1.insert(1, "Capricciosa")
Lb1.insert(2, "Quatro Stagione")
Lb1.insert(3, "Fungi")
Lb1.insert(4, "Prsuto")
Lb1.select_set(0,0)
Lb1.pack(side=TOP)

CheckVar1=IntVar()
CheckVar2=IntVar()
C1=Checkbutton(top, text="Kechap", variable=CheckVar1, onvalue=1, offvalue=0) #height, width
C2=Checkbutton(top, text="Majonez", variable=CheckVar2, onvalue=1, offvalue=0)
C1.pack(side=LEFT)
C2.pack(side=LEFT)

var=IntVar()
R1=Radiobutton(top,text="32 cm", variable=var, value=1)
R1.pack(side=RIGHT)
R2=Radiobutton(top,text="48 cm", variable=var, value=2)
R2.pack(side=RIGHT)

def Naruci():
    toping1=CheckVar1.get()
    toping2=CheckVar2.get()

    if (toping1 == 1):
        toping1="ketchapom"
    else: toping1=""
    if (toping2 == 1):
        toping2="majonezom"
    else: toping2=""

    topinzi="sa " + toping1+" "+toping2


    #print (topinzi)


    velicina=var.get()

    if velicina==1:
        velicina="32 cm"
    else:
        velicina="48 cm"



    imeE=v_ime.get()
    prezimeE=v_prezime.get()



    imePice=Lb1.get('active')

    tkinter.messagebox.showinfo("Porudzbina", "Narucili ste: " + imePice + "\n" + topinzi + "  Velicina: "+ velicina + "Narucilac: " + imeE + " " + prezimeE)


    return

B=tkinter.Button(top, text="Naruci", command=Naruci) #samo ime f-je, bez imena
B.pack(side=BOTTOM)

vreme=StringVar()
def vremeT():
    while True:
        vreme.set(time.ctime(time.time()))
        time.sleep(1)

threading.Thread(target=vremeT).start()
f=font.Font(sat, family="Verdana", size=16)
lVreme=Label(sat, font=f, textvariable=vreme)
lVreme.pack(anchor=CENTER)



root.mainloop()