【项目实战】利用urllib实现多线程爬取糗事百科段子

import threading
import urllib.request
import re
import ssl

#把ssl设置为未验证，
ssl._create_default_https_context = ssl._create_unverified_context

#给opener添加header,伪装成浏览器
header = ("User-Agent","Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:57.0) Gecko/20100101 Firefox/57.0")
opener = urllib.request.build_opener()
opener.addheaders = [header]

#将浏览器设为全局
urllib.request.install_opener(opener)

#创建线程1
class One(threading.Thread):
    def __init__(self):
        threading.Thread.__init__(self)
        
    def run(self):
        #爬取奇数页
        for i in range(1,20,2):
            urldata = urllib.request.urlopen("https://www.qiushibaike.com/8hr/page/" + str(i)).read().decode("utf-8")

            #设置正则表达式
            pat ='
.*?(.*?).*?
'
            data = re.compile(pat,re.S).findall(urldata)

            print(len(data))
            for j in range(0,len(data)):
                print("第"  + str(i) + "页的第" + str(j) + "条糗事：\n")
                print(data[j])
#创建线程2
class Two(threading.Thread):
    def __init__(self):
        threading.Thread.__init__(self)
    def run(self):

        #爬取偶数页
        for i in range(0,20,2):
            urldata = urllib.request.urlopen("https://www.qiushibaike.com/8hr/page/" + str(i)).read().decode("utf-8")

            pat ='
.*?(.*?).*?
'
            data = re.compile(pat,re.S).findall(urldata)

            for j in range(0,len(data)):
                print("第"  + str(i) + "页的第" + str(j) + "条糗事：\n")
                print(data[j])
#分别运行线程1和线程2
th1 = One()
th1.start()
th2 = Two()
th2.start()