原生爬虫（爬取熊猫直播人气主播排名）

‘‘‘‘
    This is a module
‘‘‘

import re

from urllib import request
# 断点调试

class Spider():
    ‘‘‘
        This is a class
    ‘‘‘
    # 私有方法
    # 匹配所有字符 [\s\S]*? 非贪婪
    url=‘https://www.panda.tv/all?pdt=1.27.psbar-menu.0.1oj9bbkfjbh‘
    root_pattern = ‘<div class="video-info">([\w\W]*?)</div>‘
    name_pattern = ‘</i>([\w\W]*?)</span>‘
    number_pattern = ‘<span class="video-number">([\w\W]*?)</span>‘
    def __fetch_content(self):

        # This is a HTTP request
        r = request.urlopen(Spider.url)  
        # 字节码
        htmls = r.read()
        htmls = str(htmls,encoding=‘utf-8‘)

        return htmls

    def __analysis(self, htmls):
        root_html = re.findall(Spider.root_pattern, htmls)

        anchors = []
        for html in root_html:
            name = re.findall(Spider.name_pattern, html)
            number = re.findall(Spider.number_pattern, html)
            anchor = {‘name‘:name,‘number‘:number}
            anchors.append(anchor)
        # print(root_html[0])
        # print(anchors[0])
        # print(anchors)
        return anchors
        
    def __refine(self, anchors):
        
        # 匿名函数lambda
        l = lambda anchor: {‘name‘:anchor[‘name‘][0].strip(),‘number‘:anchor[‘number‘][0]}
        # r = map(l, anchors)
        # print(r)
        return map(l,anchors)

    def __sort(self, anchors):

        # 默认增序
        anchors = sorted(anchors, key = self.__sort_seed, reverse=True)

        return anchors

    def __sort_seed(self, anchor):
        r = re.findall(‘\d*‘, anchor[‘number‘])
        number = float(r[0])
        if ‘万‘ in anchor[‘number‘]:
            number *= 10000

        return number

    def __show(self, anchors):
        for rank in range(0, len(anchors)):
            print(‘rank‘+str(rank+1)+‘:‘+anchors[rank][‘name‘]+‘ ‘+anchors[rank][‘number‘])

    def go(self):
        htmls = self.__fetch_content()
        # self.__analysis(htmls)
        anchors = self.__analysis(htmls) 
        # anchors = self.__refine(anchors)
        anchors = list(self.__refine(anchors))
        # print(anchors)
        # anchors = list(self.__refine(anchors))
        anchors = self.__sort(anchors)
        self.__show(anchors)
        # print(anchors)

spider = Spider()
spider.go()