如何为不同的spider设置不同的抓取设置？

小编典典

如何为不同的spider设置不同的抓取设置？

scrapy

我想为某些spider启用一些http代理，而对其他spider禁用它们。

我可以做这样的事情吗？

# settings.py
proxy_spiders = ['a1' , b2']

if spider in proxy_spider: #how to get spider name ???
    HTTP_PROXY = 'http://127.0.0.1:8123'
    DOWNLOADER_MIDDLEWARES = {
         'myproject.middlewares.RandomUserAgentMiddleware': 400,
         'myproject.middlewares.ProxyMiddleware': 410,
         'scrapy.contrib.downloadermiddleware.useragent.UserAgentMiddleware': None
    }
else:
    DOWNLOADER_MIDDLEWARES = {
         'myproject.middlewares.RandomUserAgentMiddleware': 400,
         'scrapy.contrib.downloadermiddleware.useragent.UserAgentMiddleware': None
    }

如果上面的代码不起作用，还有其他建议吗？

阅读 457

2020-04-09

共1个答案

小编典典

但是从1.0.0版本开始，scrapy中有一个新功能，您可以像这样覆盖每个spider的设置：

class MySpider(scrapy.Spider):
    name = "my_spider"
    custom_settings = {"HTTP_PROXY":'http://127.0.0.1:8123',
                       "DOWNLOADER_MIDDLEWARES": {'myproject.middlewares.RandomUserAgentMiddleware': 400,
                                                  'myproject.middlewares.ProxyMiddleware': 410,
                                                  'scrapy.contrib.downloadermiddleware.useragent.UserAgentMiddleware': None}}




class MySpider2(scrapy.Spider):
        name = "my_spider2"
        custom_settings = {"DOWNLOADER_MIDDLEWARES": {'myproject.middlewares.RandomUserAgentMiddleware': 400,
                                                      'scrapy.contrib.downloadermiddleware.useragent.UserAgentMiddleware': None}}

2020-04-09