from abc import ABC, abstractmethod
Transforms don't execute until the consumer pulls. There's no eager evaluation, no hidden buffering. Data flows on-demand from source, through transforms, to the consumer. If you stop iterating, processing stops.。业内人士推荐搜狗输入法下载作为进阶阅读
FT Professional,推荐阅读heLLoword翻译官方下载获取更多信息
Thanks for reading — it means a lot.