import tkinter as tk
def say_hello():
label.config(text="Hello, World!")
root = tk.Tk()
root.title("Hello App")
label = tk.Label(root, text="Нажми кнопку", font=("Arial", 18))
label.pack(pady=20)
button = tk.Button(root, text="Сказать Hello", command=say_hello, font=("Arial", 14))...