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edcde7a2
编写于
5月 18, 2017
作者:
M
Mikhail Korobov
提交者:
Paul Tremberth
5月 18, 2017
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DOC tweak release notes: promote response.follow, mention logging/stats changes
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...
@@ -11,28 +11,41 @@ but quite a few handy improvements nonetheless.
...
@@ -11,28 +11,41 @@ but quite a few handy improvements nonetheless.
Scrapy now supports anonymous FTP sessions with customizable user and
Scrapy now supports anonymous FTP sessions with customizable user and
password via the new :setting:`FTP_USER` and :setting:`FTP_PASSWORD` settings.
password via the new :setting:`FTP_USER` and :setting:`FTP_PASSWORD` settings.
**And if you're using Twisted version 17.1.0 or above, FTP is now available
And if you're using Twisted version 17.1.0 or above, FTP is now available
with Python 3.**
with Python 3.
Link extractors now work similarly to what a regular modern browser would
There's a new :meth:`response.follow <scrapy.http.TextResponse.follow>` method
do. Especially, leading and trailing whitespace are removed from attributes
for creating requests; **it is now a recommended way to create Requests
(think ``href=" http://example.com"``) when building ``Link`` objects.
in Scrapy spiders**. This method makes it easier to write correct
This whitespace-stripping also happens for ``action`` attributes with
spiders; ``response.follow`` has several advantages over creating
``FormRequest``.
``scrapy.Request`` objects directly:
**Please also note that link extractors do not canonicalize URLs by default
anymore.** This was puzzling users every now and then, and it's not what
* it handles relative URLs;
browsers do in fact, so we removed that extra transformation on extractred
* it works properly with non-ascii URLs on non-UTF8 pages;
links.
* in addition to absolute and relative URLs it supports Selectors;
for ``<a>`` elements it can also extract their href values.
For example, instead of this::
There's a new ``response.follow()`` shortcut for creating requests directly
for href in response.css('li.page a::attr(href)').extract():
from a response instance and a relative URL.
url = response.urljoin(href)
For example, instead of::
yield scrapy.Request(url, self.parse, encoding=response.encoding)
scrapy.Request(response.urljoin(somehrefvalue))
One can now write this::
you can now use the simpler::
for a in response.css('li.page a'):
yield response.follow(a, self.parse)
response.follow(somehrefvalue)
Link extractors are also improved. They work similarly to what a regular
modern browser would do: leading and trailing whitespace are removed
from attributes (think ``href=" http://example.com"``) when building
``Link`` objects. This whitespace-stripping also happens for ``action``
attributes with ``FormRequest``.
**Please also note that link extractors do not canonicalize URLs by default
anymore.** This was puzzling users every now and then, and it's not what
browsers do in fact, so we removed that extra transformation on extractred
links.
For those of you wanting more control on the ``Referer:`` header that Scrapy
For those of you wanting more control on the ``Referer:`` header that Scrapy
sends when following links, you can set your own ``Referrer Policy``.
sends when following links, you can set your own ``Referrer Policy``.
...
@@ -44,6 +57,10 @@ And this policy is fully customizable with W3C standard values
...
@@ -44,6 +57,10 @@ And this policy is fully customizable with W3C standard values
(or with something really custom of your own if you wish).
(or with something really custom of your own if you wish).
See :setting:`REFERRER_POLICY` for details.
See :setting:`REFERRER_POLICY` for details.
To make Scrapy spiders easier to debug, Scrapy logs more stats by default
in 1.4: memory usage stats, detailed retry stats, detailed HTTP error code
stats. A similar change is that HTTP cache path is also visible in logs now.
Last but not least, Scrapy now has the option to make JSON and XML items
Last but not least, Scrapy now has the option to make JSON and XML items
more human-readable, with newlines between items and even custom indenting
more human-readable, with newlines between items and even custom indenting
offset, using the new :setting:`FEED_EXPORT_INDENT` setting.
offset, using the new :setting:`FEED_EXPORT_INDENT` setting.
...
@@ -60,7 +77,7 @@ New Features
...
@@ -60,7 +77,7 @@ New Features
- Enable memusage extension by default (:issue:`2187`) ;
- Enable memusage extension by default (:issue:`2187`) ;
**this is technically backwards-incompatible** so please check if you have
**this is technically backwards-incompatible** so please check if you have
any non-default ``MEMUSAGE_***`` settings set.
any non-default ``MEMUSAGE_***`` settings set.
- New :
meth:`Response.follow <scrapy.http.Response.follow
>` shortcut
- New :
ref:`response.follow <response-follow-example
>` shortcut
for creating requests (:issue:`1940`)
for creating requests (:issue:`1940`)
- Added ``flags`` argument and attribute to :class:`Request <scrapy.http.Request>`
- Added ``flags`` argument and attribute to :class:`Request <scrapy.http.Request>`
objects (:issue:`2047`)
objects (:issue:`2047`)
...
...
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