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Tkinter - Change Label Text/Entry on Button Click

I have two labels and entry fields (A & B). When I enter the username/password for "A Username/A Password", I want to click the "Submit" button, then have the labels/entry fields change to "B Username/B Password" and be able to click the "Submit" button again, using Tkinter.
Python Code
import tkinter as tk
root = tk.Tk()
a_user_var = tk.StringVar()
a_pass_var = tk.StringVar()
b_user_var = tk.StringVar()
b_pass_var = tk.StringVar()
def submit():
a_user = a_user_var.get()
a_pass = a_pass_var.get()
a_user_var.set("")
a_pass_var.set("")
b_user = b_user_var.get()
b_pass = b_pass_var.get()
b_user_var.set("")
b_pass_var.set("")
a_user_label = tk.Label(root, text="A Username")
a_user_entry = tk.Entry(root, textvariable=a_user_var)
a_pass_label = tk.Label(root, text="A Password")
a_pass_entry = tk.Entry(root, textvariable=a_pass_var, show="•")
b_user_label = tk.Label(root, text="B Username")
b_user_entry = tk.Entry(root, textvariable=b_user_var)
b_pass_label = tk.Label(root, text="B Password")
b_pass_entry = tk.Entry(root, textvariable=b_pass_var, show="•")
sub_btn = tk.Button(root, text="Submit", command=submit)
a_user_label.grid(row=0, column=0)
a_user_entry.grid(row=0, column=1)
a_pass_label.grid(row=1, column=0)
a_pass_entry.grid(row=1, column=1)
b_user_label.grid(row=0, column=0)
b_user_entry.grid(row=0, column=1)
b_pass_label.grid(row=1, column=0)
b_pass_entry.grid(row=1, column=1)
sub_btn.grid(row=2, column=0)
root.mainloop()
Current Result
Desired Result (after clicking Submit button)

There is no need to create a unique label and entry widgets for A and B. Instead just use one set of widgets and change the label's text upon pressing the button to B. If you need to store the contents of the entry widget, you can grab the label text and parse it to see which character the specific set belongs to.
For example:
import tkinter as tk
root = tk.Tk()
user_var = tk.StringVar()
pass_var = tk.StringVar()
entries = {}
def submit():
user = user_var.get()
passw = pass_var.get()
label_text = user_label["text"]
char = label_text.split()[0]
entries[char] = (user, passw)
if char == "A":
user_label["text"] = "B" + label_text[1:]
pass_label["text"] = "B" + pass_label["text"][1:]
user_var.set('')
pass_var.set('')
print(entries)
user_label = tk.Label(root, text="A Username")
user_entry = tk.Entry(root, textvariable=user_var)
pass_label = tk.Label(root, text="A Password")
pass_entry = tk.Entry(root, textvariable=pass_var, show="•")
sub_btn = tk.Button(root, text="Submit", command=submit)
sub_btn.grid(row=2, column=0)
user_label.grid(row=0, column=0)
user_entry.grid(row=0, column=1)
pass_label.grid(row=1, column=0)
pass_entry.grid(row=1, column=1)
root.mainloop()

How do I make my button know what`s in the entry box and then print that value in a new window?

I want after you write something in the entry box and then you press the button a new window to pop up and
the number that was written in the entry box to be printed in the new window as " Your height is: "value" but after many tries I still don`t understand how to do it.
my code:
import tkinter as tk
root = tk.Tk()
root.geometry("250x130")
root.resizable(False, False)
lbl = tk.Label(root, text="Input your height", font="Segoe, 11").place(x=8, y=52)
entry = tk.Entry(root,width=15).place(x=130, y=55)
btn1 = tk.Button(root, text="Enter", width=12, height=1).place(x=130, y=85) #command=entrytxt1
root.mainloop()

This is what I got:
import tkinter as tk
root = tk.Tk()
root.resizable(False, False)
def callback():
# Create a new window
new_window = tk.Toplevel()
new_window.resizable(False, False)
# `entry.get()` gets the user input
new_window_lbl = tk.Label(new_window, text="You chose: "+entry.get())
new_window_lbl.pack()
# `new_window.destroy` destroys the new window
new_window_btn = tk.Button(new_window, text="Close", command=new_window.destroy)
new_window_btn.pack()
lbl = tk.Label(root, text="Input your height", font="Segoe, 11")
lbl.grid(row=1, column=1)
entry = tk.Entry(root, width=15)
entry.grid(row=1, column=2)
btn1 = tk.Button(root, text="Enter", command=callback)
btn1.grid(row=1, column=3)
root.mainloop()
Basically when the button is clicked it calls the function named callback. It creates a new window, gets the user's input (entry.get()) and puts it in a label.

Python Tkinter doesn't show the label when I press the button

I have one Input and one button. I want the value of the input (Entry) to when I press the button. When I type print(mtext) it works well, but when I put it in a Label it doesn't work.
Here is the code:
from tkinter import *
root = Tk()
root.title("Mohamed Atef")
root.geometry("900x600")
var = StringVar()
var.set("Please write something")
label = Label(root, textvariable=var, padx=10, pady=10)
#input
text = StringVar()
entry = Entry(root, textvariable=text)
def mohamed():
mtext = text.get()
mohamed = Label(root, textvariable=mtext)
mohamed.pack()
#button
buttonText = StringVar()
buttonText.set("Click me !")
button = Button(root, textvariable=buttonText, command=mohamed)
label.pack()
entry.pack()
button.pack()
root.mainloop()

Same as Flilp, your finished product would look like this
from tkinter import *
root = Tk()
root.title("Mohamed Atef")
root.geometry("900x600")
var = StringVar()
var.set("Please write something")
label = Label(root, textvariable=var, padx=10, pady=10)
#input
text = StringVar()
entry = Entry(root, textvariable=text)
def mohamed() :
mtext = text.get()
mohamed = Label(root, text=mtext)
mohamed.pack()
#button
buttonText = StringVar()
buttonText.set("Click me !")
button = Button(root, textvariable=buttonText, command=mohamed)
label.pack()
entry.pack()
button.pack()
root.mainloop()

If you just want text that's in your Entry to appear under your labels you could do:
def mohamed():
mohamed = Label(root, textvariable=text)
mohamed.pack()
Your code didn't work because value passed as textvariable should be tkinter StringVar() not string.
If you don't want the text to be constantly updated when you change your Entry you should do:
def mohamed():
mtext = text.get()
mohamed = Label(root, text=mtext)
mohamed.pack()

Tkinter new window

I'm relatively new to Tkinter and I need help.
I have created a new window when a button is clicked from the parent window. The new window is the def new_Window. But I can't seem to get the information in the window as coded below:
from tkinter import *
from tkinter import ttk
#User Interface Code
root = Tk() #Creates the window
root.title("Quiz Game")
def new_window():
newWindow = Toplevel(root)
display = Label(newWindow, width=200, height=50)
message = Label(root, text="Welcome")
display.pack()
message.pack()
display2 = Label(root, width=100, height=30)
button1 = Button(root, text ="Continue", command=new_window, width=16,
bg="red")
message_label = Label(root, text="Click 'Continue' to begin.",
wraplength=250)
username = StringVar() #Stores the username in text
user_entry = Entry(root, textvariable=username) #Creates an entry for the
username
user_entry.pack()
display2.pack()
button1.pack()
message_label.pack()
root.mainloop()#Runs the main window loop
Thanks for your help.

You did not pack the hello label into the new window. A tip is also to use background colors to visualize labels when developing. Here is a functioning code for you. I only changed 2 lines, added foreground and background.
from tkinter import *
from tkinter import ttk
# User Interface Code
root = Tk() # Creates the window
root.title("Quiz Game")
def new_window():
newWindow = Toplevel(root)
display = Label(newWindow, width=200, height=50,bg='RED')
message = Label(newWindow, text="HEEEY",fg='BLACK',bg='GREEN')
message.pack()
display.pack()
display2 = Label(root, width=100, height=30)
button1 = Button(root, text ="Continue", command=new_window, width=16,
bg="red")
message_label = Label(root, text="Click 'Continue' to begin.",
wraplength=250)
username = StringVar() # Stores the username in text
user_entry = Entry(root, textvariable=username) # Creates an entry for the
username
user_entry.pack()
display2.pack()
button1.pack()
message_label.pack()
root.mainloop() # Runs the main window loop

Python tkinter quiz

I am making a quiz in python using the tkinter module and I am stuck on how to create a button that checks to see if the answer is correct or not. But I would put it in a procedure however the question is already in one.
import tkinter as tk
window = tk.Tk()
window.title("6 Questions")
window.geometry("500x150")
score = 0
def inst():
t = tk.Label(window, text="All you need to do is just answer each question with either a '1, 2, 3' or the actual word.")
t.pack()
def start():
root = tk.Tk()
root.title("question 1")
q = tk.Label(root, text="what type of input holds whole numbers")
q.pack()
a = tk.Label(root, text="1.) int")
a.pack()
b = tk.Label(root, text="2.) string")
b.pack()
c = tk.Label(root, text="3.) float")
c.pack()
ans = tk.Entry(root, width=40)
ans.pack()
#here is the button I want to verify the answer
sub = tk.Button(root, text="Submit")
sub.pack()
greet = tk.Label(window, text="Welcome to the 6 Question Quiz.")
greet.pack()
start = tk.Button(window, command=start, text="Start")
start.pack()
instr = tk.Button(window, text="Instructions", command=inst)
instr.pack()
end = tk.Button(window, text="Exit", command=exit)
end.pack()

Create a function that opens when the submit button is clicked and create RadioButtons rather than Labels.
Like this:
def gettingDecision():
if var.get() is 'True':
messagebox.showinfo('Congrats', message='You Are Correct.Score is {}'.format(score))
else:
messagebox.showinfo('Lose', message='You Are Wrong.')
Question1 = ttk.Label(frame1, text='Q.1.Where does a computer add and compare data ?')
Question1.grid(row=1, column=0, sticky=W)
var = StringVar()
Q1A = ttk.Radiobutton(frame1, text='[A] Hard disk', variable=var, value='False1')
Q1A.grid(row=2, column=0, sticky=W)
Q1B = ttk.Radiobutton(frame1, text='[B] Floppy disk', variable=var, value='False2')
Q1B.grid(row=3, column=0, sticky=W)
Q1C = ttk.Radiobutton(frame1, text='[C] CPU chip', variable=var, value='True')
Q1C.grid(row=4, column=0, sticky=W)
Q1D = ttk.Radiobutton(frame1, text='[D] Memory chip', variable=var, value='False3')
Q1D.grid(row=5, column=0, sticky=W)
submit = ttk.Button(frame1, text='Submit', command=gettingDecision)
submit.grid()

Please note that, ideal way to go would be using classes.
You can define a function, inside of a function.
import tkinter as tk
window = tk.Tk()
window.title("6 Questions")
window.geometry("500x150")
score = 0
def inst():
t = tk.Label(window, text="All you need to do is just answer each question with either a '1, 2, 3' or the actual word.")
t.pack()
def start():
def submit():
print (ans.get())
#or do whatever you like with this
root = tk.Tk()
root.title("question 1")
q = tk.Label(root, text="what type of input holds whole numbers")
q.pack()
a = tk.Label(root, text="1.) int")
a.pack()
b = tk.Label(root, text="2.) string")
b.pack()
c = tk.Label(root, text="3.) float")
c.pack()
ans = tk.Entry(root, width=40)
ans.pack()
#here is the button I want to verify the answer
sub = tk.Button(root, text="Submit", command=submit)
sub.pack()
greet = tk.Label(window, text="Welcome to the 6 Question Quiz.")
greet.pack()
startButton = tk.Button(window, command=start, text="Start")
startButton.pack()
instr = tk.Button(window, text="Instructions", command=inst)
instr.pack()
end = tk.Button(window, text="Exit", command=window.destroy)
end.pack()
window.mainloop()