# Tk_frame_ratio_divided.py

# Tk_frame_ratio_divided.py

import Tkinter as Tk

# Main window
master = Tk.Tk()
master.geometry("200x60+20+20")

# Callback event that resizes the main components
def resize_it(event):
    global master # Main Window
    global a # Red Frame
    global b # Blue Frame
    #Reconfigure the main window's and frames' dimensions
    a.configure(width=event.width/2, height=event.height/2)
    b.configure(width=event.width/2, height=event.height/2)
    master.configure(width=event.width, height=event.height)

#Create a red (first) Frame
a = Tk.Frame(master, bg='red')
a.pack(side='left', expand=True, fill=Tk.BOTH)

# Draw a button on frame a
a1 = Tk.Button(a, text='Demo Button')
a1.grid(row=0, column=0)
# Disable geometry propagation
a.grid_propagate(0)

#Create a blue (second) Frame
b = Tk.Frame(master,  bg='blue')
b.pack(side='left', expand=True, fill=Tk.BOTH)
# Draw a label on frame b
l1 = Tk.Label(b, text='Label Demo '*10)
l1.grid(row=0, column=0)
# Disable geometry propagation on frame b
# Note: always after adding ALL the desired widgets to b. Same note for frame b
b.grid_propagate(0)

master.bind('<Configure>', resize_it)
#Start program
master.mainloop()