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init python:    def shop_screen(**kwargs):                button = ""        button_value = ""                                #ui.window(id="window")        ui.hbox(id="shop_hbox")                ui.imagebutton(idle_image = "prueba_idle.png", hover_image = "prueba_idle.png", insensitive_image = "prueba_idle.png",clicked=ui.returns("sword"))        ui.imagebutton(idle_image = "circulo.png", hover_image = "circulo.png", insensitive_image = "circulo.png")        ui.text("testing", id="testing")                while(True):            if button == "sword":                ui.text("espada", id="espada")            button, button_value = ui.interact()        return       renpy.define_screen("shop", shop_screen)