import tkinter as tk
from tkinter import ttk
from tkinter.messagebox import showinfo

root = tk.Tk()
root.title('Treeview demo')
root.geometry('620x200')


columns = ('DNO', 'DNOM', 'VILLE')

tree = ttk.Treeview(root, columns=columns, show='headings')

# define headings
tree.heading('DNO', text='DNO')
tree.heading('DNOM', text='DNOM')
tree.heading('VILLE', text='VILLE')

tree.column("#1", anchor=tk.CENTER)
tree.heading("#1", text="DNO")

tree.column("#2", anchor=tk.CENTER)
tree.heading("#2", text="DNOM")

tree.column("#3", anchor=tk.CENTER)
tree.heading("#3", text="VILLE")

tree.pack()

def View():

    D = {12:["KHALDI","CASA"],18:["KHALDI","CASA"],13:["KHALDI","RABAT"]}
    
    for x in D.items():
        L = [x[0],x[1][0],x[1][1]]
        tree.insert("", tk.END, values=L)        


button1 = tk.Button(text="Display data", command=View)

button1.pack(pady=10)

root.mainloop()