- # -*- coding: utf-8 -*-
- # Scrapy settings for demo1 project
- #
- # For simplicity, this file contains only settings considered important or
- # commonly used. You can find more settings consulting the documentation:
- #
- # http://doc.scrapy.org/en/latest/topics/settings.html
- # http://scrapy.readthedocs.org/en/latest/topics/downloader-middleware.html
- # http://scrapy.readthedocs.org/en/latest/topics/spider-middleware.html
- BOT_NAME = 'demo1' #Scrapy项目的名字,这将用来构造默认 User-Agent,同时也用来log,当您使用 startproject 命令创建项目时其也被自动赋值。
- SPIDER_MODULES = ['demo1.spiders'] #Scrapy搜索spider的模块列表 默认: [xxx.spiders]
- NEWSPIDER_MODULE = 'demo1.spiders' #使用 genspider 命令创建新spider的模块。默认: 'xxx.spiders'
- #爬取的默认User-Agent,除非被覆盖
- #USER_AGENT = 'demo1 (+http://www.yourdomain.com)'
- #如果启用,Scrapy将会采用 robots.txt策略
- ROBOTSTXT_OBEY = True
- #Scrapy downloader 并发请求(concurrent requests)的最大值,默认: 16
- #CONCURRENT_REQUESTS = 32
- #为同一网站的请求配置延迟(默认值:0)
- # See http://scrapy.readthedocs.org/en/latest/topics/settings.html#download-delay
- # See also autothrottle settings and docs
- #DOWNLOAD_DELAY = 3 下载器在下载同一个网站下一个页面前需要等待的时间,该选项可以用来限制爬取速度,减轻服务器压力。同时也支持小数:0.25 以秒为单位
- #下载延迟设置只有一个有效
- #CONCURRENT_REQUESTS_PER_DOMAIN = 16 对单个网站进行并发请求的最大值。
- #CONCURRENT_REQUESTS_PER_IP = 16 对单个IP进行并发请求的最大值。如果非0,则忽略 CONCURRENT_REQUESTS_PER_DOMAIN 设定,使用该设定。 也就是说,并发限制将针对IP,而不是网站。该设定也影响 DOWNLOAD_DELAY: 如果 CONCURRENT_REQUESTS_PER_IP 非0,下载延迟应用在IP而不是网站上。
- #禁用Cookie(默认情况下启用)
- #COOKIES_ENABLED = False
- #禁用Telnet控制台(默认启用)
- #TELNETCONSOLE_ENABLED = False
- #覆盖默认请求标头:
- #DEFAULT_REQUEST_HEADERS = {
- # 'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
- # 'Accept-Language': 'en',
- #}
- #启用或禁用蜘蛛中间件
- # See http://scrapy.readthedocs.org/en/latest/topics/spider-middleware.html
- #SPIDER_MIDDLEWARES = {
- # 'demo1.middlewares.Demo1SpiderMiddleware': 543,
- #}
- #启用或禁用下载器中间件
- # See http://scrapy.readthedocs.org/en/latest/topics/downloader-middleware.html
- #DOWNLOADER_MIDDLEWARES = {
- # 'demo1.middlewares.MyCustomDownloaderMiddleware': 543,
- #}
- #启用或禁用扩展程序
- # See http://scrapy.readthedocs.org/en/latest/topics/extensions.html
- #EXTENSIONS = {
- # 'scrapy.extensions.telnet.TelnetConsole': None,
- #}
- #配置项目管道
- # See http://scrapy.readthedocs.org/en/latest/topics/item-pipeline.html
- #ITEM_PIPELINES = {
- # 'demo1.pipelines.Demo1Pipeline': 300,
- #}
- #启用和配置AutoThrottle扩展(默认情况下禁用)
- # See http://doc.scrapy.org/en/latest/topics/autothrottle.html
- #AUTOTHROTTLE_ENABLED = True
- #初始下载延迟
- #AUTOTHROTTLE_START_DELAY = 5
- #在高延迟的情况下设置的最大下载延迟
- #AUTOTHROTTLE_MAX_DELAY = 60
- #Scrapy请求的平均数量应该并行发送每个远程服务器
- #AUTOTHROTTLE_TARGET_CONCURRENCY = 1.0
- #启用显示所收到的每个响应的调节统计信息:
- #AUTOTHROTTLE_DEBUG = False
- #启用和配置HTTP缓存(默认情况下禁用)
- # See http://scrapy.readthedocs.org/en/latest/topics/downloader-middleware.html#httpcache-middleware-settings
- #HTTPCACHE_ENABLED = True
- #HTTPCACHE_EXPIRATION_SECS = 0
- #HTTPCACHE_DIR = 'httpcache'
- #HTTPCACHE_IGNORE_HTTP_CODES = []
- #HTTPCACHE_STORAGE = 'scrapy.extensions.httpcache.FilesystemCacheStorage'
Python爬虫系列之----Scrapy(六)settings.py配置文件详解
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