在scrapy 1.3中，yield request和return request有什么区别? [英] In scrapy 1.3, what is the difference between a yield request and a return request?

问题描述

似乎他们提供了相同的功能，最终通过管道或提要返回一个字典或项目.有什么理由让我使用一个而不是另一个吗?

It seems they are providing the same function, ultimately returning a dict or item through a pipeline or feed. Is there a reason I would use one over the other?

推荐答案

与return"相反，yield"不退出函数并继续用你的 for 循环.如果您使用return"，则您的 for 循环将在第一次迭代后完成.

In contrast to "return", "yield" doesn't exit the function and continues with the your for-loop. If you use "return", your for-loop will finish after the first iteration.

欲了解更多信息:什么是产量"?Python 中的关键字 do?

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