爬虫实战-爬取B站top小视频

import requests
import random
import time

def get_json(url, num):
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

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

def main():
for i in range(10):
url = ‘http://api.vc.bilibili.com/board/v1/ranking/top?’
num = i * 10 + 1
html = get_json(url, num)
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='/小视频/%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

if name == ‘main’:
main()