크롤러가 Python을 사용해야 하는 이유는 무엇입니까?

 1 import urllib
 2 import urllib.request
 3 
 4 def loadPage(url,filename):
 5     """
 6     作用：根据url发送请求，获取html数据;
 7     :param url:
 8     :return:
 9     """
10     request=urllib.request.Request(url)
11     html1= urllib.request.urlopen(request).read()
12     return  html1.decode('utf-8')
13 
14 def writePage(html,filename):
15     """
16     作用将html写入本地
17 
18     :param html: 服务器相应的文件内容
19     :return:
20     """
21     with open(filename,'w') as f:
22         f.write(html)
23     print('-'*30)
24 def tiebaSpider(url,beginPage,endPage):
25     """
26     作用贴吧爬虫调度器，负责处理每一个页面url;
27     :param url:
28     :param beginPage:
29     :param endPage:
30     :return:
31     """
32     for page in range(beginPage,endPage+1):
33         pn=(page - 1)*50
34         fullurl=url+"&pn="+str(pn)
35         print(fullurl)
36         filename='第'+str(page)+'页.html'
37         html= loadPage(url,filename)
38 
39         writePage(html,filename)
40 
41 
42 
43 if __name__=="__main__":
44     kw=input('请输入你要需要爬取的贴吧名:')
45     beginPage=int(input('请输入起始页'))
46     endPage=int(input('请输入结束页'))
47     url='https://tieba.baidu.com/f?'
48     kw1={'kw':kw}
49     key = urllib.parse.urlencode(kw1)
50     fullurl=url+key
51     tiebaSpider(fullurl,beginPage,endPage)