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import Tkinter as tk

class Benutzer():

    def __init__(self):

        self.second = tk.Tk()
        self.second.title("Second window")
        self.second.geometry("%dx%d+%d+%d" % (200, 100, 600, 250))

        self.var = tk.StringVar()
        self.var.set("hallo")
        self.label = tk.Label(self.second, textvariable=self.var)
        self.label.place(relx=.2, rely=.2, anchor="w")

        self.start_button = tk.Button(self.second, text="CLOSE", width=15, command=self.close)
        self.start_button.place(relx=.2, rely=.5, anchor="w")

    def close(self):
        self.second.destroy()


class MyFirstGUI:

    def __init__(self):

        self.first = tk.Tk()
        self.first.title("First window")
        self.first.geometry("%dx%d+%d+%d" % (200, 100, 600, 250))
        self.label = tk.Label(self.first, text="This is my first GUI!")
        self.label.place(relx=.2, rely=.2, anchor="w")
        self.start_button = tk.Button(self.first, text="START", width=15, command=self.start)
        self.start_button.place(relx=.2, rely=.5, anchor="w")
        self.start_button = tk.Button(self.first, text="CLOSE", width=15, command=self.close)
        self.start_button.place(relx=.2, rely=.8, anchor="w")
        self.first.mainloop()

    def start(self):
        self.first.withdraw()
        self.first.update_idletasks()
        benutzer_thread = Benutzer()
        print ("Finished!")

    def close(self):
        self.first.destroy()


MyFirstGUI()