def __repr__(self):
        return "<NamedRequirements({}{})>".format(
            self.name,
            ", filename='{}'".format(self.filename.name) if self.filename
            else "")
def _on_event_box_enter_notify_event(self, event_box, event):
    if event.detail != gtk.gdk.NOTIFY_INFERIOR:
      self._hbox_buttons.show()