青春有你2

爬虫的过程

1.发送请求(requests模块)

2.获取响应数据(服务器返回)

3.解析并提取数据(BeautifulSoup查找或者re正则)

4.保存数据

request模块:

requests是python实现的简单易用的HTTP库,官网地址:http://cn.python-requests.org/zh_CN/latest/

requests.get(url)可以发送一个http get请求,返回服务器响应内容。

BeautifulSoup库:

BeautifulSoup 是一个可以从HTML或XML文件中提取数据的Python库。网址:https://beautifulsoup.readthedocs.io/zh_CN/v4.4.0/

BeautifulSoup支持Python标准库中的HTML解析器,还支持一些第三方的解析器,其中一个是 lxml。

BeautifulSoup(markup, "html.parser")或者BeautifulSoup(markup, "lxml"),推荐使用lxml作为解析器,因为效率更高。

1.导入模块 

import json
import re
import requests
import datetime
from bs4 import BeautifulSoup
import os
#获取当天的日期,并进行格式化,用于后面文件命名,格式:20200508w
today = datetime.date.today().strftime('%Y%m%d')   

2.方法

def crawl_wiki_data():
    headers = { 
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36'
    }
    url='https://baike.baidu.com/item/青春有你第二季'                         
    try:
        response = requests.get(url,headers=headers)
        print(response.status_code)
        #将一段文档传入BeautifulSoup的构造方法,就能得到一个文档的对象, 可以传入一段字符串
        soup = BeautifulSoup(response.text,'lxml')
        #返回的是class为table-view log-set-param的所有标签
        tables = soup.find_all('table',{'class':'table-view log-set-param'})
        crawl_table_title = "参赛学员"
        for table in  tables:           
            #对当前节点前面的标签和字符串进行查找
            table_titles = table.find_previous('div').find_all('h3')
            for title in table_titles:
                if(crawl_table_title in title):
                    return table       
    except Exception as e:
        print(e)
def parse_wiki_data(table_html):
    '''
    从百度百科返回的html中解析得到选手信息,以当前日期作为文件名,存JSON文件,保存到work目录下
    '''
    bs = BeautifulSoup(str(table_html),'lxml')
    all_trs = bs.find_all('tr')

    error_list = ['\'','\"']

    stars = []

    for tr in all_trs[1:]:
         all_tds = tr.find_all('td')

         star = {}

         #姓名
         star["name"]=all_tds[0].text
         #个人百度百科链接
         star["link"]= 'https://baike.baidu.com' + all_tds[0].find('a').get('href')
         #籍贯
         star["zone"]=all_tds[1].text
         #星座
         star["constellation"]=all_tds[2].text
         #身高
         star["height"]=all_tds[3].text
         #体重
         star["weight"]= all_tds[4].text

         #花语,去除掉花语中的单引号或双引号
         flower_word = all_tds[5].text
         for c in flower_word:
             if  c in error_list:
                 flower_word=flower_word.replace(c,'')
         star["flower_word"]=flower_word 
         
         #公司
         if not all_tds[6].find('a') is  None:
             star["company"]= all_tds[6].find('a').text
         else:
             star["company"]= all_tds[6].text  

         stars.append(star)

    json_data = json.loads(str(stars).replace("\'","\""))   
    with open('work/' + today + '.json', 'w', encoding='UTF-8') as f:
        json.dump(json_data, f, ensure_ascii=False)
def crawl_pic_urls():
    '''
    爬取每个选手的百度百科图片,并保存
    ''' 
    with open('work/'+ today + '.json', 'r', encoding='UTF-8') as file:
         json_array = json.loads(file.read())

    headers = { 
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36' 
     }
    pic_urls= []
    for star in json_array:

        name = star['name']
        link = star['link']
        pic_urls= []
        #!!!请在以下完成对每个选手图片的爬取,将所有图片url存储在一个列表pic_urls中!!!
    
        '获取每个选手主页面'
        response = requests.get(link,headers=headers)
        soup = BeautifulSoup(response.text,'lxml')
        #图集
        images = soup.select('.summary-pic a')[0].get('href')
        imageURLS = 'https://baike.baidu.com'+images
        response_img = requests.get(imageURLS,headers=headers)
        soup_img = BeautifulSoup(response_img.text,'lxml')
        img_url = soup_img.select('div .pic-list img')
        for i in img_url:
            pic_urls.append(i.get('src'))
   
        #!!!根据图片链接列表pic_urls, 下载所有图片,保存在以name命名的文件夹中!!!
        down_pic(name,pic_urls)
def down_pic(name,pic_urls):
    '''
    根据图片链接列表pic_urls, 下载所有图片,保存在以name命名的文件夹中,
    '''
    path = 'work/'+'pics/'+name+'/'

    if not os.path.exists(path):
      os.makedirs(path)

    for i, pic_url in enumerate(pic_urls):
        try:
            pic = requests.get(pic_url, timeout=15)
            string = str(i + 1) + '.jpg'
            with open(path+string, 'wb') as f:
                f.write(pic.content)
                print('成功下载第%s张图片: %s' % (str(i + 1), str(pic_url)))
        except Exception as e:
            print('下载第%s张图片时失败: %s' % (str(i + 1), str(pic_url)))
            print(e)
            continue
def show_pic_path(path):
    '''
    遍历所爬取的每张图片,并打印所有图片的绝对路径
    '''
    pic_num = 0
    for (dirpath,dirnames,filenames) in os.walk(path):
        for filename in filenames:
           pic_num += 1
           print("第%d张照片:%s" % (pic_num,os.path.join(dirpath,filename)))           
    print("共爬取《青春有你2》选手的%d照片" % pic_num)

3.运行

if __name__ == '__main__':

     #爬取百度百科中《青春有你2》中参赛选手信息,返回html
     html = crawl_wiki_data()

     #解析html,得到选手信息,保存为json文件
     parse_wiki_data(html)

     #从每个选手的百度百科页面上爬取图片,并保存
     crawl_pic_urls()

     #打印所爬取的选手图片路径
     show_pic_path('/pics/')

     print("所有信息爬取完成!")

 

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