Adicione a fonte ao rótulo no Window Tknter
import tkinter
window = tkinter.Tk() # creating the window object
window.title('my first GUI program')
window.minsize(width=600, height=500)
# label
# adding text to the middle of the window
my_label = tkinter.Label(text='I am a Label', font=('Cursive', 24, 'bold'))
my_label.pack()
window.mainloop() # keeping the window until we close it
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