# -*- coding: utf-8 -*-
import tkinter as tk
import tkinter.ttk as ttk
root = tk.Tk()
root.title("tk23.py")
root.geometry("250x200")
#####################################
def fa():
    aLb.config(text = 'Button clicked.')
def fb():
    bLb.config(text = 'Button clicked.')
ttk.Style().configure('TLabel', background = 'pink', 
         foreground = 'blue', relief = 'sunken')
ttk.Style().configure('TButton', background = 'gold', 
         foreground = 'red', relief = 'raised')
ttk.Style().configure('TFrame', borderwidth = 0, 
         background = 'lightgreen')

nb = ttk.Notebook(root)
frame_Apple = ttk.Frame(nb, style = 'TFrame')
nb.add(frame_Apple, text = 'Apple')
aLb = ttk.Label(frame_Apple, text = "Apple", style = 'TLabel')
aBtn = ttk.Button(frame_Apple, text = 'AButton', 
                  style = 'TButton', command = fa)
frame_Banana = ttk.Frame(nb, style = 'TFrame')
nb.add(frame_Banana, text = 'Banana')
bLb = ttk.Label(frame_Banana, text = "Banana", style = 'TLabel')
bBtn = ttk.Button(frame_Banana, text = 'BButton', 
                  style = 'TButton', command = fb)

nb.pack()
aLb.pack()
aBtn.pack()
bLb.pack()
bBtn.pack()
#####################################
root.mainloop()