python - Dynamically add to allowed_domains in a Scrapy spider -

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i have spider starts small list of allowed_domains @ beginning of spidering. need add more domains dynamically whitelist spidering continues within parser, following piece of code not accomplished since subsequent requests still being filtered. there of updating allowed_domains within parser?

class apspider(basespider): name = "apspider"  allowed_domains = ["www.somedomain.com"]  start_urls = [     "http://www.somedomain.com/list-of-websites", ]  ...  def parse(self, response):     soup = beautifulsoup( response.body )      link_tag in soup.findall('td',{'class':'half-width'}):         _website = link_tag.find('a')['href']         u = urlparse.urlparse(_website)         self.allowed_domains.append(u.netloc)          yield request(url=_website, callback=self.parse_secondary_site)  ...

you try following:

class apspider(basespider): name = "apspider"  start_urls = [     "http://www.somedomain.com/list-of-websites", ]  def __init__(self):     self.allowed_domains = none  def parse(self, response):     soup = beautifulsoup( response.body )      if not self.allowed_domains:         link_tag in soup.findall('td',{'class':'half-width'}):             _website = link_tag.find('a')['href']             u = urlparse.urlparse(_website)             self.allowed_domains.append(u.netloc)              yield request(url=_website, callback=self.parse_secondary_site)      if response.url in self.allowed_domains:         yield request(...)  ...

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