Skip to content
体验新版
项目
组织
正在加载...
登录
切换导航
打开侧边栏
looyolo
scrapy
提交
2de5c660
S
scrapy
项目概览
looyolo
/
scrapy
与 Fork 源项目一致
从无法访问的项目Fork
通知
2
Star
0
Fork
0
代码
文件
提交
分支
Tags
贡献者
分支图
Diff
Issue
0
列表
看板
标记
里程碑
合并请求
0
Wiki
0
Wiki
分析
仓库
DevOps
项目成员
Pages
S
scrapy
项目概览
项目概览
详情
发布
仓库
仓库
文件
提交
分支
标签
贡献者
分支图
比较
Issue
0
Issue
0
列表
看板
标记
里程碑
合并请求
0
合并请求
0
Pages
分析
分析
仓库分析
DevOps
Wiki
0
Wiki
成员
成员
收起侧边栏
关闭侧边栏
动态
分支图
创建新Issue
提交
Issue看板
体验新版 GitCode,发现更多精彩内容 >>
提交
2de5c660
编写于
6月 14, 2015
作者:
E
Elias Dorneles
浏览文件
操作
浏览文件
下载
电子邮件补丁
差异文件
improvements for docs on how to access settings
上级
f958fb9d
变更
2
隐藏空白更改
内联
并排
Showing
2 changed file
with
36 addition
and
10 deletion
+36
-10
docs/Makefile
docs/Makefile
+1
-0
docs/topics/settings.rst
docs/topics/settings.rst
+35
-10
未找到文件。
docs/Makefile
浏览文件 @
2de5c660
...
...
@@ -23,6 +23,7 @@ help:
@
echo
" text to make plain text files"
@
echo
" changes to make an overview over all changed/added/deprecated items"
@
echo
" linkcheck to check all external links for integrity"
@
echo
" watch build HTML docs, open in browser and watch for changes"
build
:
...
...
docs/topics/settings.rst
浏览文件 @
2de5c660
...
...
@@ -67,14 +67,22 @@ Example::
Spiders (See the :ref:`topics-spiders` chapter for reference) can define their
own settings that will take precedence and override the project ones. They can
do so by setting their :attr:`scrapy.spiders.Spider.custom_settings` attribute.
do so by setting their :attr:`~scrapy.spiders.Spider.custom_settings` attribute::
class MySpider(scrapy.Spider):
name = 'myspider'
custom_settings = {
'SOME_SETTING': 'some value',
}
3. Project settings module
--------------------------
The project settings module is the standard configuration file for your Scrapy
project. It's where most of your custom settings will be populated. For
example:: ``myproject.settings``.
project, it's where most of your custom settings will be populated. For a
standard Scrapy project, this means you'll be adding or changing the settings
in the ``settings.py`` file created for your project.
4. Default settings per-command
-------------------------------
...
...
@@ -95,22 +103,39 @@ How to access settings
.. highlight:: python
In a spider, the settings are available through ``self.settings``::
class MySpider(scrapy.Spider):
name = 'myspider'
start_urls = ['http://example.com']
def parse(self, response):
print("Existing settings: %s" % self.settings.attributes.keys())
.. note::
The ``settings`` attribute is set in the base Spider class after the spider
is initialized. If you want to use the settings before the initialization
(e.g., in your spider's ``__init__()`` method), you'll need to override the
:meth:`~scrapy.spiders.Spider.from_crawler` method.
Settings can be accessed through the :attr:`scrapy.crawler.Crawler.settings`
attribute of the Crawler that is passed to ``from_crawler`` method in
extensions
and middlewar
es::
extensions
, middlewares and item pipelin
es::
class MyExtension(object):
def __init__(self, log_is_enabled=False):
if log_is_enabled:
print("log is enabled!")
@classmethod
def from_crawler(cls, crawler):
settings = crawler.settings
if settings['LOG_ENABLED']:
print "log is enabled!"
return cls(settings.getbool('LOG_ENABLED'))
In other words, settings can be accessed like a dict, but it's usually preferred
to extract the setting in the format you need it to avoid type errors. In order
to do that you'll have to use one of the methods provided the
:class:`~scrapy.settings.Settings` API.
The settings object can be used like a dict (e.g.,
``settings['LOG_ENABLED']``), but it's usually preferred to extract the setting
in the format you need it to avoid type errors, using one of the methods
provided by the
:class:`~scrapy.settings.Settings` API.
Rationale for setting names
===========================
...
...
编辑
预览
Markdown
is supported
0%
请重试
或
添加新附件
.
添加附件
取消
You are about to add
0
people
to the discussion. Proceed with caution.
先完成此消息的编辑!
取消
想要评论请
注册
或
登录