【Python爬蟲實戰】多線程爬蟲---糗事百科段子爬取

多線程爬蟲：即程式中的某些程式段並行執行，
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

 1 '''
 2 #此處代碼為普通爬蟲
 3 import urllib.request
 4 import urllib.error
 5 import re
 6 
 7 headers = ("User-Agent","Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36")
 8 opener = urllib.request.build_opener()
 9 opener.addheaders = [headers]
10 urllib.request.install_opener(opener)
11 for i in range(1,2):
12     url = "https://www.qiushibaike.com/8hr/page/"+str(i)+"/"
13     pagedata = urllib.request.urlopen(url).read().decode("utf-8","ignore")
14     pattern = '<div class="content">.*?<span>(.*?)</span>(.*?)</div>'
15     datalist = re.compile(pattern,re.S).findall(pagedata)
16     for j in range(0,len(datalist)):
17         print("第"+str(i)+"頁第"+str(j)+"個段子內容是：")
18         print(datalist[j])
19 '''
20 
21 '''
22 #此處為多線程介紹代碼
23 import threading   #導入多線程包
24 class A(threading.Thread):  #創建一個多線程A
25     def __init__(self):     #必須包含的兩個方法之一:初始化線程
26         threading.Thread.__init__(self)
27     def run(self):          #必須包含的兩個方法之一：線程運行方法
28         for i in range(0,11):
29             print("我是線程A")
30 
31 class B(threading.Thread):  #創建一個多線程A
32     def __init__(self):     #必須包含的兩個方法之一:初始化線程
33         threading.Thread.__init__(self)
34     def run(self):          #必須包含的兩個方法之一：線程運行方法
35         for i in range(0,11):
36             print("我是線程B")
37 
38 t1 = A()    #線程實例化
39 t1.start()  #線程運行
40 t2 = B()
41 t2.start()
42 '''
43 
44 
45 #此處為修改後的多線程爬蟲
46 #使用多線程進行奇偶頁的爬取
47 import urllib.request
48 import urllib.error
49 import re
50 import threading
51 
52 headers = ("User-Agent","Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36")
53 opener = urllib.request.build_opener()
54 opener.addheaders = [headers]
55 urllib.request.install_opener(opener)
56 class one(threading.Thread):   #爬取奇數頁內容
57     def __init__(self):
58         threading.Thread.__init__(self)
59     def run(self):
60         for i in range(1,12,2):
61             url = "https://www.qiushibaike.com/8hr/page/"+str(i)+"/"
62             pagedata = urllib.request.urlopen(url).read().decode("utf-8","ignore")
63             pattern = '<div class="content">.*?<span>(.*?)</span>(.*?)</div>'
64             datalist = re.compile(pattern,re.S).findall(pagedata)
65             for j in range(0,len(datalist)):
66                 print("第"+str(i)+"頁第"+str(j)+"段子內容為：")
67                 print(datalist[j])
68 
69 
70 class two(threading.Thread):   #爬取奇數頁內容
71     def __init__(self):
72         threading.Thread.__init__(self)
73     def run(self):
74         for i in range(2,12,2):
75             url = "https://www.qiushibaike.com/8hr/page/"+str(i)+"/"
76             pagedata = urllib.request.urlopen(url).read().decode("utf-8","ignore")
77             pattern = '<div class="content">.*?<span>(.*?)</span>(.*?)</div>'
78             datalist = re.compile(pattern,re.S).findall(pagedata)
79             for j in range(0,len(datalist)):
80                 print("第"+str(i)+"頁第"+str(j)+"段子內容為：")
81                 print(datalist[j])
82 t1 = one()
83 t2 = two()
84 t1.start()
85 t2.start()