python异常处理

常用：

        try:
            """执行以下语句"""
            pass
        except Exception as e:
            """异常时执行"""
            print('错误类型是', e.__class__.__name__)
            print('错误明细是', e)
            raise e
        else:
            """正常时执行"""
            pass
        finally:
            """无论异常还是正常都执行"""
            pass