from tkinter import *

def click(event):
 def close_window (): 
  new.destroy()
  #root.destroy()

 new = Tk()
 new.title("New")
 new.geometry('200x200+100+100')
 new.configure(bg= '#ff5f00')
 button = Button (new, text = "Good-bye.", command =close_window)
 button.pack()
 new.mainloop()

root = Tk()
root.title("Python")
root.geometry('400x250')
root.configure(bg= '#ff5f00')


b = Button(root, text="Кнопка")
b.grid(column=0, row=2)
b.bind("<Button-1>", click)

root.mainloop()