用Python爬取Bilibili视频,你学废了吗?

 

 

B 站视频网址:

https://vc.bilibili.com/p/eden/rank#/?tab=全部

 用Python爬取Bilibili视频,你学废了吗?

 通过 F12 打开开发者模式,然后在 Networking -> Name 字段下找到这个链接:

http://api.vc.bilibili.com/board/v1/ranking/top?page_size=10&next_offset=&tag=%E4%BB%8A%E6%97%A5%E7%83%AD%E9%97%A8&platform=pc

 用Python爬取Bilibili视频,你学废了吗?next_offset 会一直变化,我们可以猜测,这个可能就是获取下一个视频序号,我们只需要把这部分参数取出来,把 next_offset 写成变量值,用 JSON 的格式返回到目标网页即可。

用Python爬取Bilibili视频,你学废了吗?我们通过上面的尝试写了段代码,发现 B 站在一定程度上做了反爬虫操作,所以我们需要先获取 headers 信息,否则下载下来的视频是空的,然后定义 params 参数存储 JSON 数据,然后通过 requests.get 去获取其参数值信息,用 JSON 的格式返回到目标网页即可,实现代码如下:

def get_json(url):
 headers = {
 'User-Agent': 
 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36'
 }
 
 params = {
 'page_size': 10,
 'next_offset': str(num),
 'tag': '今日热门',
 'platform': 'pc'
 }
 
 try:
 html = requests.get(url,params=params,headers=headers)
 return html.json()
 
 except BaseException:
 print('request error')
 pass

为了能够清楚的看到我们下载的情况,我们折腾了一个下载器上去,实现

 

def download(url,path):
 start = time.time() # 开始时间
 size = 0
 headers = {
 'User-Agent': 
 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36'
 }
 
 response = requests.get(url,headers=headers,stream=True) # stream属性必须带上
 chunk_size = 1024 # 每次下载的数据大小
 content_size = int(response.headers['content-length']) # 总大小
 if response.status_code == 200:
 print('[文件大小]:%0.2f MB' %(content_size / chunk_size / 1024)) # 换算单位
 with open(path,'wb') as file:
 for data in response.iter_content(chunk_size=chunk_size):
 file.write(data)
 size += len(data) # 已下载的文件大小

 效果如下:

 用Python爬取Bilibili视频,你学废了吗?

 

#!/usr/bin/env python#-*-coding:utf-8-*-import requestsimport randomimport timedef get_json(url):
 headers = {
 'User-Agent': 
 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36'
 }
 
 params = {
 'page_size': 10,
 'next_offset': str(num),
 'tag': '今日热门',
 'platform': 'pc'
 }
 
 try:
 html = requests.get(url,params=params,headers=headers)
 return html.json()
 
 except BaseException:
 print('request error')
 passdef download(url,path):
 start = time.time() # 开始时间
 size = 0
 headers = {
 'User-Agent': 
 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36'
 }
 
 response = requests.get(url,headers=headers,stream=True) # stream属性必须带上
 chunk_size = 1024 # 每次下载的数据大小
 content_size = int(response.headers['content-length']) # 总大小
 if response.status_code == 200:
 print('[文件大小]:%0.2f MB' %(content_size / chunk_size / 1024)) # 换算单位
 with open(path,'wb') as file:
 for data in response.iter_content(chunk_size=chunk_size):
 file.write(data)
 size += len(data) # 已下载的文件大小
 
 if __name__ == '__main__':
 for i in range(10):
 url = 'http://api.vc.bilibili.com/board/v1/ranking/top?'
 num = i*10 + 1
 html = get_json(url)
 infos = html['data']['items']
 for info in infos:
 title = info['item']['description'] # 小视频的标题
 video_url = info['item']['video_playurl'] # 小视频的下载链接
 print(title)
 
 # 为了防止有些视频没有提供下载链接的情况
 try:
 download(video_url,path='%s.mp4' %title)
 print('成功下载一个!')
 
 except BaseException:
 print('凉凉,下载失败')
 pass
 
 time.sleep(int(format(random.randint(2,8)))) # 设置随机等待时间

 进下面链接,学习更多python小技巧。

https://note.youdao.com/s/bfdk7lCG

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