Python多线程爬虫实战_爬取糗事百科段子的实例

Python  /  管理员 发布于 7年前   149

多线程爬虫：即程序中的某些程序段并行执行，

合理地设置多线程，可以让爬虫效率更高

糗事百科段子普通爬虫和多线程爬虫

分析该网址链接得出：

https://www.qiushibaike.com/8hr/page/页码/

多线程爬虫也就和JAVA的多线程差不多，直接上代码

'''#此处代码为普通爬虫import urllib.requestimport urllib.errorimport reheaders = ("User-Agent","Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36")opener = urllib.request.build_opener()opener.addheaders = [headers]urllib.request.install_opener(opener)for i in range(1,2): url = "https://www.qiushibaike.com/8hr/page/"+str(i)+"/" pagedata = urllib.request.urlopen(url).read().decode("utf-8","ignore") pattern = '<div class="content">.*?<span>(.*?)</span>(.*?)</div>' datalist = re.compile(pattern,re.S).findall(pagedata) for j in range(0,len(datalist)):  print("第"+str(i)+"页第"+str(j)+"个段子内容是：")  print(datalist[j])''''''#此处为多线程介绍代码import threading #导入多线程包class A(threading.Thread): #创建一个多线程A def __init__(self):  #必须包含的两个方法之一:初始化线程  threading.Thread.__init__(self) def run(self):   #必须包含的两个方法之一：线程运行方法  for i in range(0,11):   print("我是线程A")class B(threading.Thread): #创建一个多线程A def __init__(self):  #必须包含的两个方法之一:初始化线程  threading.Thread.__init__(self) def run(self):   #必须包含的两个方法之一：线程运行方法  for i in range(0,11):   print("我是线程B")t1 = A() #线程实例化t1.start() #线程运行t2 = B()t2.start()'''#此处为修改后的多线程爬虫#使用多线程进行奇偶页的爬取import urllib.requestimport urllib.errorimport reimport threadingheaders = ("User-Agent","Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36")opener = urllib.request.build_opener()opener.addheaders = [headers]urllib.request.install_opener(opener)class one(threading.Thread): #爬取奇数页内容 def __init__(self):  threading.Thread.__init__(self) def run(self):  for i in range(1,12,2):   url = "https://www.qiushibaike.com/8hr/page/"+str(i)+"/"   pagedata = urllib.request.urlopen(url).read().decode("utf-8","ignore")   pattern = '<div class="content">.*?<span>(.*?)</span>(.*?)</div>'   datalist = re.compile(pattern,re.S).findall(pagedata)   for j in range(0,len(datalist)):    print("第"+str(i)+"页第"+str(j)+"段子内容为：")    print(datalist[j])class two(threading.Thread): #爬取奇数页内容 def __init__(self):  threading.Thread.__init__(self) def run(self):  for i in range(2,12,2):   url = "https://www.qiushibaike.com/8hr/page/"+str(i)+"/"   pagedata = urllib.request.urlopen(url).read().decode("utf-8","ignore")   pattern = '<div class="content">.*?<span>(.*?)</span>(.*?)</div>'   datalist = re.compile(pattern,re.S).findall(pagedata)   for j in range(0,len(datalist)):    print("第"+str(i)+"页第"+str(j)+"段子内容为：")    print(datalist[j])t1 = one()t2 = two()t1.start()t2.start()

以上这篇Python多线程爬虫实战_爬取糗事百科段子的实例就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。