How to Get a Popup Dialog in Python Tkinter

Program 1

from tkinter import *
import tkinter.messagebox

def btnClick(n):
    if(n==1):
        #choice=tkinter.messagebox.askyesnocancel("Exit Window","Are you Sure want to exit...")
       #print(choice)
        choice = tkinter.messagebox.askokcancel("Exit Window", "Are you Sure want to exit...")
        if(choice==True):
            myroot.destroy()
    elif(n==2):
         tkinter.messagebox.showinfo("window","Record save successfully")
         tkinter.messagebox.showerror("window", "Record Not save Error")
         tkinter.messagebox.showwarning("window", "Record Not save Error")
         tkinter.messagebox.askquestion("question","This is Question")
myroot=Tk()
myroot.geometry('600x600')
myroot.title("Message Window Application")
myroot.wm_iconbitmap('2.ico')
myroot.maxsize(600,600)
myroot.minsize(600,600)
fm=Frame(myroot,width=600,height=600,bg='yellow')
fm.pack()
fm.propagate(0)
btnexit=Button(fm,text="Exit",font=('Arial,10,bold'),command=lambda :btnClick(1))
btnsave=Button(fm,text="Save",font=('Arial,10,bold'),command=lambda :btnClick(2))
btnsearch=Button(fm,text="Search",font=('Arial,10,bold'),command=lambda :btnClick(3))
btnexit.pack()
btnsave.pack()
btnsearch.pack()
myroot.mainloop()