def __repr__(self):
        return "<Requirement(package={package}, version='{version}')>".format(
            package=self.package, version=self.version)
def _init_liststore(self):
        """Creates the liststore"""
        self.liststore = Gtk.ListStore(object, GdkPixbuf.Pixbuf, str, str)
        self.set_model(self.liststore)