在python中处理ValueError的最佳方法是什么

Question

我想检查我的python应用程序中的类型错误。以下列方式捕捉ValueError是正确的方法吗？

async def find_video_by_id(request):
    try:
        id = int(request.query['id'])
        ...
    except ValueError:
        exception_message = "Incorrect type of video id was specified."
        logger.exception(exception_message)
        raven_client.captureException(exception_message)
        raise ValueError(exception_message)
    except Exception as ex:
        logger.exception("find_video_by_id")
        raven_client.captureException()
        raise ex

Answer 1

如果你想有自定义和标准的例外，你可以执行以下操作：

# Custom Exception
class MyError(Exception):
    pass
try:
    id = int(request.query['id']) #raise ValueError automatically if string cannot be parsed
    if id == 'foo': # just to show how to raise a custom Exception
        raise MyError
    else:
        bar()
except ValueError:
     exception_message = "Incorrect type of video id was specified."
     logger.exception(exception_message)
     raven_client.captureException(exception_message)
except MyError:
     exception_message = "Incorrect stuff."
     logger.exception(exception_message)
     raven_client.captureException(exception_message)