from tkinter import *
from idlelib.tooltip import Hovertip

def okno2():
    ak = Tk()
    ak.title(“Окно 2”)
    ak.geometry(“150x80”)

    btn = Button (ak, text=“Окно2”, height = 4, width = 20)
    btn.pack(side=LEFT)
    Hovertip(btn, )
    tk.mainloop()

tk = Tk()
tk.title(“Окно1”)
tk.geometry(“100x80”)

btn = Button (tk, text=“Старт”, height = 4, width = 20, command = okno2)
btn.pack(side=LEFT)
tk.mainloop()