Python爬取某拍短视频

# eplace()方法用于在字符串中用一些字符替换另一些字符
 # parseInt 数据转换成对应的整型
 # base64.atob对base64编码过的字符串进行解码
 # substring 方法可在字符串中抽取从 start 下标开始的指定数目的字符

import base64
def decode(data):
 def getHex(a):
  return {
'str': a[4:],
'hex': ''.join(list(a[:4])[::-1]),
  }
 def getDec(a):
  b = str(int(a, 16))
  return {
'pre': list(b[:2]),
'tail': list(b[2:]),
  }
 def substr(a, b):
  c = a[0: int(b[0])]
  d = a[int(b[0]): int(b[0]) + int(b[1])]
  return c + a[int(b[0]):].replace(d, "")
 def getPos(a, b):
  b[0] = len(a) - int(b[0]) - int(b[1])
  return b
 b = getHex(data)
 c = getDec(b['hex'])
 d = substr(b['str'], c['pre'])
 return base64.b64decode(substr(d, getPos(d, c['tail'])))
print(decode("e121Ly9tBrI84RdnZpZGVvMTAubWVpdHVkYXRhLmNvbS82MGJjZDcwNTE3NGZieXBueG5udnRwMTA5N19IMjY0XzFfNWY3YThmM2U0MTEwNy5tc2JVjAu3EDQ="))

import requests
from lxml import etree
import base64
def decode_mp4(data):
 def getHex(a):
  return {
'str': a[4:],
'hex': ''.join(list(a[:4])[::-1]),
  }
 def getDec(a):
  b = str(int(a, 16))
  return {
'pre': list(b[:2]),
'tail': list(b[2:]),
  }
 def substr(a, b):
  c = a[0: int(b[0])]
  d = a[int(b[0]): int(b[0]) + int(b[1])]
  return c + a[int(b[0]):].replace(d, "")
 def getPos(a, b):
  b[0] = len(a) - int(b[0]) - int(b[1])
  return b
 b = getHex(data)
 c = getDec(b['hex'])
 d = substr(b['str'], c['pre'])
 return base64.b64decode(substr(d, getPos(d, c['tail'])))
# 运行主函数
def main():
 url = 'https://www.meipai.com'
 headers = {
  'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36',
 }
 response = requests.get(url=url, headers=headers)
 html_data = etree.HTML(response.text)
 href_list = html_data.xpath('//div/a/@href')
 # print(href_list)
 for href in href_list:
  res = requests.get('https://www.meipai.com' + href, headers=headers)
  html = etree.HTML(res.text)
  name = html.xpath('//div[@id="detailVideo"]/img/@alt')[0]
  mp4_data = html.xpath('//div[@id="detailVideo"]/@data-video')[0]
  # print(name, mp4_data)
  mp4_url = decode_mp4(mp4_data).decode('utf-8')
  print(mp4_url)
  result = requests.get("http:" + mp4_url)
  with open(name + ".mp4", 'wb') as f:
f.write(result.content)
f.close()

if __name__ == '__main__':
 main()