Texto del botón de cambio de tkinter
import tkinter as tk
root = tk.Tk()
def update_btn_text():
btn_text.set("b")
btn_text = tk.StringVar()
btn = tk.Button(root, textvariable=btn_text, command=update_btn_text)
btn_text.set("a")
btn.pack()
root.mainloop()
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