def get_row_by_task_id(self, task_id):
for row in self.liststore:<EOL><INDENT>if row and row[TASKID_COL] == task_id:<EOL><INDENT>return row<EOL><DEDENT><DEDENT>return None<EOL>
返回这个任务的TreeModelRow, 如果不存在, 就返回None.