新建文件crawlertask.py，用于执行数据抓取任务，代码如下。

#coding:utf-8
from celery import Celery,platforms
import  requests
from bs4 import BeautifulSoup

app=Celery('tasks',broker='redis://localhost:6379/0')
app.conf.CELERY_RESULT_BACKEND='redis://localhost:6379/0'

platforms.C_FORCE_ROOT=True

def format_str(str):
    return str.replace("n","").replace(" ","").replace("t","")


@app.task
def get_urls_in_pages(from_page_num,to_page_num):
    urls=[]
    search_word='计算机'
    url_part_1='http://www.phei.com.cn/module/goods/'
            'searchkey.jsp?Page='
    url_part_2='&Page=2&searchKey='

    for i in range(from_page_num,to_page_num+1):
        urls.append(url_part_1+str(i)+url_part_2+search_word)

    all_href_list=[]

    for url in urls:
        resp=requests.get(url)
        bs=BeautifulSoup(resp.text)
        a_list=bs.find_all('a')
        needed_list=[]
        for a in a_list:
            if 'href' in a.attrs:
                href_val=a['href']
                title=a.text
                if 'bookid' in href_val and 'shopcar0.jsp' not in href_val and title!='':
                    if [title,href_val] not in needed_list:
                        needed_list.append([format_str(title),format_str(href_val)])
        all_href_list+=needed_list

    all_href_file = open(str(from_page_num)+'_'+str(to_page_num)+'_'+'all_hrefs.txt','w')

    for href in all_href_list:
        all_href_file.write('t'.join(href)+'n')

    all_href_file.close()
    return len(all_href_list)

将以上脚本部署到两台云端服务器。

   并且在云端开启redis服务，然后执行：

    celery worker -A crawlertask -l info -c 10

   在本机新建文件task_dist.py用于异步分发任务，代码如下：

from celery import Celery
from threading import Thread
import time

redis_ips={
    0:'redis://101.200.163.195:6379/0',
    1:'redis://112.124.28.41:6379/0',
    2:'redis://112.124.28.41:6379/0',
    3:'redis://101.200.163.195:6379/0',
}

def send_task_and_get_results(ind,from_page,to_page):
    app=Celery('crawlertask',broker=redis_ips[ind])
    app.conf.CELERY_RESULT_BACKEND=redis_ips[ind]
    result=app.send_task('crawlertask.get_urls_in_pages',args=(from_page,to_page))
    print(redis_ips[ind],result.get())

if __name__=='__main__':
    t1=time.time()
    page_ranges_lst=[
        (1,10),
        (11,20),
        (21,30),
        (31,40),
    ]

    th_lst = []

    for ind, page_range in enumerate(page_ranges_lst):
        th = Thread(target=send_task_and_get_results,
                              args=(ind,page_range[0], page_range[1]))

        th_lst.append(th)

    for th in th_lst:
        th.start()

    for th in th_lst:
        th.join()

    t2 = time.time()
    print("用时：", t2 - t1)