3. Usando un messagebox

def salvar_dados():
   try:
      fileD = open("encomendas.txt","a")
      fileD.write("Destino:\n")
      fileD.write("%s\n" %destino.get())
      fileD.write("Descricao:\n")
      fileD.write("%s\n" %descricao.get())
      fileD.write("Endereco:\n")
      fileD.write("%s\n" %endereco.get("1.0",END))
      destino.set(None)
      descricao.delete(0,END)
      endereco.delete("1.0",END)
   except Exception as excecao:
      app.title('Erro de gravacao no arquivo %s' %excecao)

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