用Python爬取Bilibili视频,你学废了吗?
作者:互联网
B 站视频网址:
https://vc.bilibili.com/p/eden/rank#/?tab=全部
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
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。
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:
#!/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
标签:content,你学,headers,Python,chunk,get,爬取,url,size 来源: https://blog.csdn.net/boss_python/article/details/118091870