Python初学12-爬虫

淡淡的烟草味﹌ 2022-05-22 04:40 312阅读 0赞

'''  
爬虫前奏：  
    1.明确目的  
    2.找到数据相对应得网页  
    3.分析网页结构，找到数据的所在标签的位置  
      
操作：  
            模拟HTTP请求，向服务器发送这个请求，获取到服务器返回的页面  
            正则表达式提取我们需要的数据  
'''  
虎牙主页主播和人气

'''
 
 
 <img data-original="https://huyaimg.msstatic.com/avatar/1084/b7/896bc815db9560eabbcb4a227f62ba_180_135.jpg" src="https://huyaimg.msstatic.com/avatar/1084/b7/896bc815db9560eabbcb4a227f62ba_180_135.jpg" οnerrοr="this.οnerrοr=null; this.src='//a.msstatic.com/huya/main/assets/img/default/84x84.jpg';" alt="卡尔" title="卡尔">
 卡尔---------数据1
 
 
 
 107.3万 ------------数据2
 
 
 '''

代码实现

#encoding:utf-8
 '''
 Created on 2018年6月14日
 
 @author: Administrator
 '''
 from urllib import request
 import re
 
 class Spider():
 url = 'https://www.huya.com/g/lol'
 
 root_pattern = '([\s\S]*)' 
 name_pattern = '([\s\S]*?)'
 num_pattern = '([\s\S]*?)' 
 
 def __fetch_content(self): #私有方法__xx__
 r=request.urlopen(Spider.url)
 htmls = r.read()
 htmls = str(htmls,encoding='utf-8')
 #print(htmls)
 return htmls
 
 def __anaysis(self,htmls): 
 root_html = re.findall(self.root_pattern, htmls)
 #print(type(root_html),len(root_html))
 
 for html in root_html:
 #print(html)
 name = re.findall(self.name_pattern,html)
 num = re.findall(self.num_pattern,html)
 anchors = {'name':name,'num':num}
 #print(anchors)
 
 data_name = []
 data_num = []
 for anchor_name in anchors['name']:
 name={'name':anchor_name}
 data_name.append(name)
 
 for anchor_num in anchors['num']:
 #end = anchor_num[len(anchor_num)-1]
 #print(end,type(end))
 #print('万',type('万'))
 #print(end=='万')
 
 if '万' in anchor_num:
 r = re.findall('\d*',anchor_num)
 anchor_num =str (float(r[0])*10000)
 
 num={'num':float(anchor_num)}
 data_num.append(num)
 
 #print(data_name)
 #print(data_num)
 
 datas = list(map(lambda name,num:{'name':name['name'],'num':num['num']},data_name,data_num))
 #print('__anaysis',datas) 
 return datas
 #print(anchors[0]) 
 
 def __sortData(self,datas): 
 datas.sort(key=lambda x:x['num'],reverse = True)
 return datas
 
 def __showData(self,datas): 
 for data in datas:
 print(data)
 def go(self):
 htmls=self.__fetch_content()
 datas=self.__anaysis(htmls)
 sort_datas=self.__sortData(datas)
 self.__showData(sort_datas)
 
 spider = Spider()
 spider.go()