Tkinter Python frame.pack() command Not Giving The Expected Output

Question

I've been following a Tkinter Python tutorial on its frame widget.
(Under the subsection Assigning Widgets to Frames With Frame Widgets. Search by that phrase to get there easily.)

frame_a=tk.Frame()    
frame_b=tk.Frame()

label_a=tk.Label(text="I am frame A")   
label_a.master=frame_a    
label_a.pack()   

label_b=tk.Label(text="I am frame B")  
label_b.master=frame_b
label_b.pack()

frame_a.pack()  
frame_b.pack()  

When I ran this code it successfully gave output.
Consider the last two lines; the tutorial suggested to change their order, and put frame_b.pack() before frame_a.pack() and that will make the phrase 'I am frame B' will come on top, as frame_b is packed first.

However, I get the same output as before. What is am I doing wrong here? (The code runs without errors.)

Answer 1

As @Brian commented, label_a.master() does not do anything, so move the label.pack() commands like this:

frame_a=tk.Frame()    
frame_b=tk.Frame()

label_a=tk.Label(text="I am frame A")   

label_b=tk.Label(text="I am frame B")  

label_b.pack()
label_a.pack()#Moved

frame_b.pack()
frame_a.pack()