python scrapy同时执行spiders多个爬虫

假设spiders文件夹下多个文件：

name.py     name = 'name'

name1.py    name = 'name1'

name2.py    name = 'name2'

...

这里可以根据上篇文章http://www.cnblogs.com/chaihy/p/9044574.html  

根据条件查询的列表，查询的时候可以设置where 前1000条，1000-2000条，2000-3000条 ... 可以同时爬取文件相当于多进程处理

首先创建commands文件夹 和 spiders同级目录

commands 文件夹创建文件：

        crawlall.py文件

        __init__.py空文件 

crawlall.py文件内容如下：（获取spiders文件夹下所有的文件）

from scrapy.commands import ScrapyCommand
from scrapy.crawler import CrawlerRunner
from scrapy.utils.conf import arglist_to_dict
class Command(ScrapyCommand):
  requires_project = True
  def syntax(self):
    return '[options]'
  def short_desc(self):
    return 'Runs all of the spiders'
  def add_options(self, parser):
    ScrapyCommand.add_options(self, parser)
    parser.add_option("-a", dest="spargs", action="append", default=[], metavar="NAME=VALUE",
              help="set spider argument (may be repeated)")
    parser.add_option("-o", "--output", metavar="FILE",
              help="dump scraped items into FILE (use - for stdout)")
    parser.add_option("-t", "--output-format", metavar="FORMAT",
              help="format to use for dumping items with -o")
  def process_options(self, args, opts):
    ScrapyCommand.process_options(self, args, opts)
    try:
      opts.spargs = arglist_to_dict(opts.spargs)
    except ValueError:
        pass
      # raise UsageError("Invalid -a value, use -a NAME=VALUE", print_help=False)
  def run(self, args, opts):
    #settings = get_project_settings()

    spider_loader = self.crawler_process.spider_loader
    for spidername in args or spider_loader.list():
      print "*********cralall spidername************" + spidername
      self.crawler_process.crawl(spidername, **opts.spargs)
    self.crawler_process.start()

settings 配置：

COMMANDS_MODULE = 'project.commands'

执行命令：

scrapy crawlall