from tkinter import *

tk = Tk()
tk.geometry('500x500')
clicks = -1

def btn_clicked():
	lista = ['maçã','banana','abacaxi']
	global clicks

	if clicks < 2:
		clicks = clicks + 1
		lbl['text'] = '{} {}'.format(lbl['text'], lista[clicks])
	else:
		pass

lbl = Label(tk, text='teste')
lbl.grid(column=0, row=0)
btn = Button(tk, text='click me', command=btn_clicked)
btn.grid(column=0, row=1)

tk.mainloop()