多線程爬蟲：即程序中的某些程序段并行執行，
合理地設置多線程，可以讓爬蟲效率更高
糗事百科段子普通爬蟲和多線程爬蟲
分析該網址鏈接得出：
https://www.qiushibaike.com/8hr/page/頁碼/
多線程爬蟲也就和JAVA的多線程差不多，直接上代碼
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'''#此處代碼為普通爬蟲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)+"頁第"+str(j)+"個段子內容是：") print(datalist[j])''''''#此處為多線程介紹代碼import threading #導入多線程包class A(threading.Thread): #創建一個多線程A def __init__(self): #必須包含的兩個方法之一:初始化線程 threading.Thread.__init__(self) def run(self): #必須包含的兩個方法之一：線程運行方法 for i in range(0,11): print("我是線程A")class B(threading.Thread): #創建一個多線程A def __init__(self): #必須包含的兩個方法之一:初始化線程 threading.Thread.__init__(self) def run(self): #必須包含的兩個方法之一：線程運行方法 for i in range(0,11): print("我是線程B")t1 = A() #線程實例化t1.start() #線程運行t2 = B()t2.start()'''#此處為修改后的多線程爬蟲#使用多線程進行奇偶頁的爬取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): #爬取奇數頁內容 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)+"頁第"+str(j)+"段子內容為：") print(datalist[j])class two(threading.Thread): #爬取奇數頁內容 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)+"頁第"+str(j)+"段子內容為：") print(datalist[j])t1 = one()t2 = two()t1.start()t2.start() |
以上這篇Python多線程爬蟲實戰_爬取糗事百科段子的實例就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支持服務器之家。
原文鏈接：http://www.cnblogs.com/Liuyt-61/archive/2017/12/14/8040238.html
