爬取哔哩哔哩每日热榜

#哔哩哔哩每日热榜
#网页链接：https://www.bilibili.com/ranking?
import requests
from bs4 import BeautifulSoup
#发出request请求，获取html网页
url = 'https://www.bilibili.com/ranking?'
kv = {'user-agent': 'Mozilla/5.0'}#伪装爬虫
r = requests.get(url,timeout = 30,headers=kv)
r.text#获取源代码
html=r.text
#解析网页，提取内容
soup=BeautifulSoup(html,'lxml')#构造Soup的对象
res = soup.find_all('a',class_='title')
num = 0
text = ''
for i in res:
    num+=1
    text+='{}{}\n'.format(num,i.string)#先把内容保存到变量里去
print(text)
#保存
with open('rank.text','w',encoding='utf8')as fout:
    fout.write(text)

2020.3.26

import requests
from bs4 import BeautifulSoup
import csv
import datetime
url = 'https://www.bilibili.com/ranking?'
#发起网络请求
response = requests.get(url)
html_text = response.text
soup = BeautifulSoup(html_text,'html.parser')
def main():
    #用来保存视频信息的对象
    class Video:
        def __init__(self,rank,title,point,visit,up,url):
            self.rank = rank
            self.title = title
            self.point = point
            self.visit = visit
            self.up = up
            self.url = url
        def to_csv(self):
            return [self.rank,self.title,self.point,self.visit,self.up,self.url]

        @staticmethod
        def csv_title():
            return ['排名','标题','分数','播放量','UP','URL']
    #提取列表
    items = soup.find_all('li',{'class':'rank-item'})
    videos = [] #保存提取出来的video
    for itm in items:
        title = itm.find('a',{'class':'title'}).text#标题
        point = itm.find('div',{'class':'pts'}).text#综合得分
        rank = itm.find('div',{'class':'num'}).text#排名
        visit = itm.find('span',{'class':'data-box'}).text#播放量
        up = itm.find_all('a',)[2].text#up
        url = itm.find('a',{'class':'title'}).get('href')#获取链接
        v = Video(rank,title,point,visit,up,url)
        videos.append(v)

    #保存
    now_str = datetime.datetime.now().strftime('%Y%m%d')
    file_name = f'top100.csv_{now_str}.csv'
    with open(file_name,'w',newline='') as f:
        writer = csv.writer(f)
        writer.writerow(Video.csv_title())
        for v in videos:
            writer.writerow(v.to_csv())

1.打开网页

2.获取源代码

3.解析网页，提取需要的内容，先找第一名的

 

这里找到需要提取的标题a标签，分析特点，它的类是title，在代码中可以用find_all函数查找

发现成功将排行榜爬取下来，想到可以用for循环把结果一个个打印出来

 

因为内容都是按顺序排下来的，所以可以自己弄数字形成排名

 

 

然后把内容保存到一个变量里去并检查有没有正常保存

最后直接保存到文件里面去，创建一个rank.txt,以写入的方式打开，把它赋值到fout这个变量里，fout写入获取到的文本内容

获取数据截图