#!/usr/bin/python3

import tkinter as tk

class MainWindow(tk.Tk):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

        self.title("Trace-Test-Window")
        self.geometry("400x300")
        self.text_label = tk.StringVar()
        self.text_forground = tk.StringVar(value="red")
        self.text_label.set("This is the main window")
        self.label = tk.Label(self, textvariable=self.text_label)
        self.label.grid(row=0, column=0, padx=10, pady=10)
        self.label.grid_remove()
        
        self.button_text = tk.StringVar()
        self.button_text.set("Drück für andere Text anzeige")
        self.button = tk.Button(self, textvariable=self.button_text, command=self.toggle_lable)
        self.button.grid(row=1, column=0, padx=10, pady=10)

        self.text_label.trace_add("write", self.update_label)
        self.text_forground.trace_add("write", self.update_label)

    def update_label(self, *args):
        self.label.configure(foreground=self.text_forground.get())

        if self.text_label.get():
            self.label.grid()
        else:
            self.label.grid_remove()

    def toggle_lable(self):
 
        if 'main window' in self.text_label.get():
            self.text_label.set("gewechseltes label")
            self.button_text.set("Drück für main window")
        else:
            self.text_label.set("This is the main window")
            self.button_text.set("Drück für andere Text anzeige")

if __name__ == "__main__":
    window = MainWindow()
    window.mainloop()