本文實(shí)例講述了Python實(shí)現(xiàn)在線程里運(yùn)行scrapy的方法。分享給大家供大家參考。具體如下：

如果你希望在一個(gè)寫好的程序里調(diào)用scrapy，就可以通過下面的代碼，讓scrapy運(yùn)行在一個(gè)線程里。

"""

Code to run Scrapy crawler in a thread - works on Scrapy 0.8

"""

import threading, Queue

from twisted.internet import reactor

from scrapy.xlib.pydispatch import dispatcher

from scrapy.core.manager import scrapymanager

from scrapy.core.engine import scrapyengine

from scrapy.core import signals

class CrawlerThread(threading.Thread):

def __init__(self):

threading.Thread.__init__(self)

self.running = False

def run(self):

self.running = True

scrapymanager.configure(control_reactor=False)

scrapymanager.start()

reactor.run(installSignalHandlers=False)

def crawl(self, *args):

if not self.running:

raise RuntimeError("CrawlerThread not running")

self._call_and_block_until_signal(signals.spider_closed, \

scrapymanager.crawl, *args)

def stop(self):

reactor.callFromThread(scrapyengine.stop)

def _call_and_block_until_signal(self, signal, f, *a, **kw):

q = Queue.Queue()

def unblock():

q.put(None)

dispatcher.connect(unblock, signal=signal)

reactor.callFromThread(f, *a, **kw)

q.get()

# Usage example below:

import os

os.environ.setdefault('SCRAPY_SETTINGS_MODULE', 'myproject.settings')

from scrapy.xlib.pydispatch import dispatcher

from scrapy.core import signals

from scrapy.conf import settings

from scrapy.crawler import CrawlerThread

settings.overrides['LOG_ENABLED'] = False # avoid log noise

def item_passed(item):

print "Just scraped item:", item

dispatcher.connect(item_passed, signal=signals.item_passed)

crawler = CrawlerThread()

print "Starting crawler thread..."

crawler.start()

print "Crawling somedomain.com...."

crawler.crawl('somedomain.com) # blocking call

print "Crawling anotherdomain.com..."

crawler.crawl('anotherdomain.com') # blocking call

print "Stopping crawler thread..."

crawler.stop()

希望本文所述對大家的Python程序設(shè)計(jì)有所幫助。

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