How to modify a Label when writing in Entry on Tkinter?

Question

I would like to make a program that detects the change in the Entry text and changes the Label to the same Entry text, as I can do this?

from tkinter import *

# Configurações da Tela
window = Tk()
window.title("Hello World")  
window.resizable(width=False, height=False)
window.geometry("300x300")

TextoLabel = StringVar()
TextoLabel.set("AAAAAA")
#Criando uma funcao para dar update na Label


# Widgets
entrada = Entry(window)
lbl = Label(textvariable = TextoLabel)
b = Button(text="see ya?!")

# Mostrar todos os itens na tela
b.pack()
entrada.pack()
lbl.pack()
window.mainloop()

while True:
    if entryname.get() == "":
        TextoLabel.set("Nada")
        window.update_idletasks()
    else:
        TextoLabel.set(entryname.get())
        window.update_idletasks()

Answer 1

For starters, I advise against using loops in Tkinter, because they will interfere with mainloop.

What you want to do can be done in at least two ways:

1. Use the same object StringVar either for the object Entry be for the Label, which is as simple as the following:

   from tkinter import *
   
   
   root = Tk()
   
   prompt = Label(root, text="Insere algo")
   prompt.pack(side="left")
   
   entry_content = StringVar()
   
   # Associando "entry_content" a propriedade "textvariable".
   # O que escreves no "entry" é "absorvido" pelo "entry_content"
   
   entry = Entry(root, textvariable=entry_content) 
   entry.pack(side="left")
   
   # O valor do "entry_content" é modificado no "entry"
   # E essa modificação vai-se refletir nesta "label"    
   
   label = Label(root, text="", textvariable=entry_content)
   label.pack(side="left")
   
   root.mainloop()
   

2. Do not use an object StringVar, but associate a call to a function with a certain event, in this case the event is <KeyRelease>, which practically happens when you stop pressing a button. In this function you can like control the content of the Label and compare it with the content of Entry.

   from tkinter import *
   
   
   root = Tk()
   
   prompt = Label(root, text="Insere algo")
   prompt.pack(side="left")
   
   entry = Entry(root)
   entry.pack(side="left")
   
   
   def on_key_pressing(event, entry, label):
       print(entry.get(), label.cget("text"))
       if entry.get() != label.cget("text"):
           label.config(text=entry.get())
   
   # Associando o evento <Key> com a chamada
   # a funcão on_key_pressing
   entry.bind("<KeyRelease>", lambda e: on_key_pressing(e, entry, label))
   
   label = Label(root, text="")
   label.pack(side="left")
   
   root.mainloop()
   

If you don’t understand something, ask in the comments, and I edit the answer ;)