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体验新版 GitCode,发现更多精彩内容 >>
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edca2832
编写于
6月 13, 2016
作者:
E
Elias Dorneles
提交者:
GitHub
6月 13, 2016
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Merge pull request #2054 from matt-oconnell/tutorial-typos
Typo fixes
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docs/intro/tutorial.rst
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docs/intro/tutorial.rst
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edca2832
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@@ -470,12 +470,12 @@ Here is a modification to our spider that does just that::
item['desc'] = sel.xpath('text()').extract()
yield item
Now the `parse()` method only extract the interesting links from the page,
Now the `parse()` method only extract
s
the interesting links from the page,
builds a full absolute URL using the `response.urljoin` method (since the links can
be relative) and yields new requests to be sent later, registering as callback
the method `parse_dir_contents()` that will ultimately scrape the data we want.
What you see here is
the
Scrapy's mechanism of following links: when you yield
What you see here is Scrapy's mechanism of following links: when you yield
a Request in a callback method, Scrapy will schedule that request to be sent
and register a callback method to be executed when that request finishes.
...
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@@ -483,7 +483,7 @@ Using this, you can build complex crawlers that follow links according to rules
you define, and extract different kinds of data depending on the page it's
visiting.
A common pattern is a callback method that extract some items, looks for a link
A common pattern is a callback method that extract
s
some items, looks for a link
to follow to the next page and then yields a `Request` with the same callback
for it::
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