1，基础知识

• step1：使用requests.get()获取网页源代码
• step2： 使用BeautifulSoup解析网页

2，自己试着爬取小猪租房的房源信息

注：题目要求爬取300个房源信息，为节约时间及内存，我仅试着爬了两页。

• The Result:

part of the information

• The Code:

from bs4 import BeautifulSoup
import requests
urls = ["http://bj.xiaozhu.com/search-duanzufang-p{}-0/".format(number) for number in range(1, 3)]
#print(urls)

def get_details(url, data = None):
    wb_data = requests.get(url)
    soup = BeautifulSoup(wb_data.text, 'lxml')
    titles = soup.select('body > div.wrap.clearfix.con_bg > div.con_l > div.pho_info > h4 > em')
    ads = soup.select('body > div.wrap.clearfix.con_bg > div.con_l > div.pho_info > p > span')
    big_imgs = soup.select('#curBigImage')
    prices = soup.select('#pricePart > div.day_l > span')
    names = soup.select('#floatRightBox > div.js_box.clearfix > div.w_240 > h6 > a')
    member_pics = soup.select('#floatRightBox > div.js_box.clearfix > div.member_pic > a > img')
    sexes = soup.select('#floatRightBox > div.js_box.clearfix > div.member_pic > div')
    for title, ad, big_img, price, name, member_pic, member_sex in zip(titles, ads, big_imgs, prices, names, member_pics, sexes):
        title = title.get_text()
        ad = ad.get_text()
        big_img = big_img.get('src')
        price = price.get_text()
        name = name.get('title')
        member_pic = member_pic.get('src')
        member_sex = judge_sex(member_sex.get('class')[0])
        print(title, '地址:',ad, '图片:',big_img, '价格(RMB):',price, '房东姓名:', name, '房东美皂:',member_pic, '房东性别:', member_sex )

def judge_sex(sex):
        if sex == 'member_ico1':
            return '女'
        elif sex == 'member_ico':
            return '男'
        else:
            return '未知'

def get_link(url, data = None):
    wb_data = requests.get(url)
    soup = BeautifulSoup(wb_data.text, 'lxml')
    #print(soup)
    links = soup.select('#page_list > ul > li > a')
    #print('links = ', links)
    for link in links:
        single_link = link.get('href')
        #print(single_link)
        get_details(single_link)

for single_url in urls:
    get_link(single_url)

##page_list > ul > li:nth-child(3) > a
#http://bj.xiaozhu.com/search-duanzufang-p1-0/
#body > div.wrap.clearfix.con_bg > div.con_l > div.pho_info > h4 > em

3，反思与总结

• 对函数运用更加熟练
• copy selector的时候看看是否有其他可供选择的地方
• 第一次失败的原因是手打错了链接，浪费了很多时间找错误，今后还是应该用“复制-粘贴”的方式填写链接
• if, elif, else后面有“:”