python爬虫Day1（requests基本使用）

import time
import requests
# 爬虫三部曲
# 1.发送请求
def get_page(url):
    response = requests.get(url)
    return response

# 2.解析数据
import re
def parse_index(html):
#     findall匹配所有
#     re.findall('正则匹配规则','匹配文本','匹配模式')
#     re.S:对全部文本进行搜索匹配
      detail_urls = re.findall('<div class="items"><a class="imglink" href="(.*?)"',html, re.S )
      return detail_urls
# for detail_url in detail_urls:
#     print(detail_url)

# 解析详情页
def parse_detail(html):
    movie_url = re.findall('<source src="(.*?)">',html,re.S)
    # print(movie_url)
    if movie_url:
        return  movie_url[0] #只返回视频的详细网址

# 3.保存数据
import uuid
# uuid.uuid4() 根据时间
def save_video(content):
    with open('{}.mp4'.format(uuid.uuid4()),'wb') as f:
        f.write(content)
        print('视频下载完毕')
# main + 回车键
if __name__ == '__main__':
    for line in range(6):
        url = 'http://www.xiaohuar.com/list-3-{}.html'.format(line)
        # 发送请求
        response = get_page(url)
        # print(response)
        #返回响应状态码
        # print(response.status_code)

        # 返回响应文本
        #print(response.text)

        #解析主页页面
        detail_urls = parse_index(response.text)

        #循环遍历详情页url
        for detail_url in detail_urls:
            print(detail_url)
            # 往每一个详情页发送请求
            detail_response = get_page(detail_url)
            #print(response.text)

            #解析详情页获取视频url
            movie_url = parse_detail(detail_response.text)

            #判断视频url存在则打印
            if movie_url:
                print(movie_url)

                #往视频url发送请求获取视频二进制流
                movie_response = get_page(movie_url)

                #把视频的二进制流传给save_video函数去保存到本地
                save_video(movie_response.content)