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零基础全实战入门

文章作者:www.7415.com 上传时间:2019-10-16

DC学院   《Python 爬虫:入门+进阶》系统课程   

第一节:下载百度首页信息

import requests

data = requests.get('https://www.baidu.com/')
data.encoding='utf-8'

print(data.text)

  

第二节:Requsts+Xpath 爬取豆瓣电影

1.爬取单个元素信息

import requests
from lxml import etree

url = 'https://movie.douban.com/subject/1292052/'
data = requests.get(url).text
s=etree.HTML(data)

file=s.xpath('//*[@id="content"]/h1/span[1]/text()')
print(file)

2.爬取多个元素信息

import requests
from lxml import etree

url = 'https://movie.douban.com/subject/1292052/'
data = requests.get(url).text
s=etree.HTML(data)

film=s.xpath('//*[@id="content"]/h1/span[1]/text()')
director=s.xpath('//*[@id="info"]/span[1]/span[2]/a/text()')
actor=s.xpath('//*[@id="info"]/span[3]/span[2]/a/text()')
time=s.xpath('//*[@id="info"]/span[13]/text()')

print('电影名称:',film)
print('导演:',director)
print('主演:',actor)
print('片长:',time)

  

www.7415.com,第四节:爬取豆瓣图书TOP250信息

from lxml import etree
import requests
import time

for a in range(10):
    url = 'https://book.douban.com/top250?start={}'.format(a*25)
    data = requests.get(url).text

    s=etree.HTML(data)
    file=s.xpath('//*[@id="content"]/div/div[1]/div/table')
    time.sleep(3)

    for div in file:
        title = div.xpath("./tr/td[2]/div[1]/a/@title")[0]
        href = div.xpath("./tr/td[2]/div[1]/a/@href")[0]
        score=div.xpath("./tr/td[2]/div[2]/span[2]/text()")[0]
        num=div.xpath("./tr/td[2]/div[2]/span[3]/text()")[0].strip("(").strip().strip(")").strip()
        scrible=div.xpath("./tr/td[2]/p[2]/span/text()")

        if len(scrible) > 0:
            print("{},{},{},{},{}n".format(title,href,score,num,scrible[0]))
        else:
            print("{},{},{},{}n".format(title,href,score,num))

  

第五节:爬取小猪短租房屋信息

from lxml import etree
import requests
import time

for a in range(1,6):
    url = 'http://cd.xiaozhu.com/search-duanzufang-p{}-0/'.format(a)
    data = requests.get(url).text

    s=etree.HTML(data)
    file=s.xpath('//*[@id="page_list"]/ul/li')
    time.sleep(3)

    for div in file:
        title=div.xpath("./div[2]/div/a/span/text()")[0]
        price=div.xpath("./div[2]/span[1]/i/text()")[0]
        scrible=div.xpath("./div[2]/div/em/text()")[0].strip()
        pic=div.xpath("./a/img/@lazy_src")[0]

        print("{}   {}   {}   {}n".format(title,price,scrible,pic))

  

第六节:将爬取的数据存到本地

1.存储小猪短租数据

from lxml import etree
import requests
import time

with open('/Users/mac/Desktop/xiaozhu.csv','w',encoding='utf-8') as f:
    for a in range(1,6):
        url = 'http://cd.xiaozhu.com/search-duanzufang-p{}-0/'.format(a)
        data = requests.get(url).text

        s=etree.HTML(data)
        file=s.xpath('//*[@id="page_list"]/ul/li')
        time.sleep(3)

        for div in file:
            title=div.xpath("./div[2]/div/a/span/text()")[0]
            price=div.xpath("./div[2]/span[1]/i/text()")[0]
            scrible=div.xpath("./div[2]/div/em/text()")[0].strip()
            pic=div.xpath("./a/img/@lazy_src")[0]

            f.write("{},{},{},{}n".format(title,price,scrible,pic))

2.存储豆瓣图书TOP250数据

from lxml import etree
import requests
import time

with open('/Users/mac/Desktop/top250.csv','w',encoding='utf-8') as f:
    for a in range(10):
        url = 'https://book.douban.com/top250?start={}'.format(a*25)
        data = requests.get(url).text

        s=etree.HTML(data)
        file=s.xpath('//*[@id="content"]/div/div[1]/div/table')
        time.sleep(3)

        for div in file:
            title = div.xpath("./tr/td[2]/div[1]/a/@title")[0]
            href = div.xpath("./tr/td[2]/div[1]/a/@href")[0]
            score=div.xpath("./tr/td[2]/div[2]/span[2]/text()")[0]
            num=div.xpath("./tr/td[2]/div[2]/span[3]/text()")[0].strip("(").strip().strip(")").strip()
            scrible=div.xpath("./tr/td[2]/p[2]/span/text()")

            if len(scrible) > 0:
                f.write("{},{},{},{},{}n".format(title,href,score,num,scrible[0]))
            else:
                f.write("{},{},{},{}n".format(title,href,score,num))

  

第七节:爬取豆瓣分类电影信息,解决动态加载页面

import requests
import json
import time

for a in range(3):
    url_visit = 'https://movie.douban.com/j/new_search_subjects?sort=T&range=0,10&tags=&start={}'.format(a*20)
    file = requests.get(url_visit).json()   #这里跟之前的不一样,因为返回的是 json 文件
    time.sleep(2)

    for i in range(20):
        dict=file['data'][i]   #取出字典中 'data' 下第 [i] 部电影的信息
        urlname=dict['url']
        title=dict['title']
        rate=dict['rate']
        cast=dict['casts']

        print('{}  {}  {}  {}n'.format(title,rate,'  '.join(cast),urlname))

     

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