download：Android 应用程序构建实战+原理精讲

本课程基于最新构建工具链，以一个页面路由框架的开发-发布为主线，将实战与理论相结合，深度学习 Gradle 及时下热门的编译时注解处理、字节码插桩等高级技术，带领大家系统化掌握 Android 应用构建知识，提升开发效率。

技术要求
Android基础知识
Android Studio等开发工具的基本使用
环境参数
技术语言：Groovy/Java/Kotlin
Android: 10.0+开发平台：Mac
IDE：Android Studio 4.0+Gradle：6.0+
Android Gradle Plugin: 4.1.0+

#!/usr/bin/python
from bs4 import BeautifulSoup
import requests
def getHouseList(url):
house =[]
headers = {'User-Agent':'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.71 Safari/537.1 LBBROWSER'}
#get从网页获取信息
res = requests.get(url,headers=headers)
#解析内容
soup = BeautifulSoup(res.content,'lxml')
#房源title
housename_divs = soup.findall('div',class='title')
for housename_div in housename_divs:
housename_as=housename_div.find_all('a')
for housename_a in housename_as:
housename=[]
#标题
housename.append(housename_a.get_text())
#超链接
housename.append(housename_a['href'])
house.append(housename)
huseinfo_divs = soup.findall('div',class='houseInfo')
for i in range(len(huseinfo_divs)):
info = huseinfo_divs[i].get_text()
infos = info.split('|')
#小区称号
house[i].append(infos[0])
#户型
house[i].append(infos[1])
#平米
house[i].append(infos[2])
#查询总价
house_prices = soup.findall('div',class='totalPrice')
for i in range(len(house_prices)):
#价钱
price = house_prices[i].get_text()
house[i].append(price)
return house
#爬取房屋细致信息：所在区域、套内面积
def houseinfo(url):
headers = {'User-Agent':'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.71 Safari/537.1 LBBROWSER'}
res = requests.get(url,headers=headers)
soup = BeautifulSoup(res.content,'lxml')
msg =[]
#所在区域
areainfos = soup.findall('span',class='info')
for areainfo in areainfos:
#只需求获取第一个a标签的内容即可
area = areainfo.find('a')
if(not area):
continue
hrefStr = area['href']
if(hrefStr.startswith('javascript')):
continue
msg.append(area.get_text())
break
#依据房屋户型计算套内面积
infolist = soup.find_all('div',id='infoList')
num = []
for info in infolist:
cols = info.findall('div',class='col')
for i in cols:
pingmi = i.get_text()
try:
a = float(pingmi[:-2])
num.append(a)
except ValueError:
continue
msg.append(sum(num))
return msg
#将房源信息写入txt文件
def writeFile(houseinfo):
f = open('d:/房源.txt','a',encoding='utf8')

houseinfo.join('\n')

f.write(houseinfo+'\n')
f.close()

#主函数
def main():
for i in range(1,100):
print('-----分隔符',i,'-------')
if i==1:
url ='https://sjz.lianjia.com/ershoufang/hy1f2f5sf1l3l2l4a2a3a4/'
else:
url='https://sjz.lianjia.com/ershoufang/pg'+str(i)+'hy1f2f5sf1l3l2l4a2a3a4/'
houses =getHouseList(url)
for house in houses:
link = house[1]
if(not link.startswith('http')):
continue
mianji = houseinfo(link)
#将套内面积、所在区域增加到房源信息
house.extend(mianji)
print(house)
info = " ".join([str(x) for x in house])
writeFile(info)
if name == 'main':
main()
从链家网站查询到8849条房源信息，但是页面只能显现31（每页数量）*100（总页码）=3100条房源，其他没找到。

第二版:

获取某个小区的房源信息，并写入excel。

#!/usr/bin/python
from bs4 import BeautifulSoup
import requests
import xlwt
def getHouseList(url):
house =[]
headers = {'User-Agent':'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.71 Safari/537.1 LBBROWSER'}
#get从网页获取信息
res = requests.get(url,headers=headers)
#解析内容
soup = BeautifulSoup(res.content,'html.parser')
#房源title
housename_divs = soup.findall('div',class='title')
for housename_div in housename_divs:
housename_as=housename_div.find_all('a')
for housename_a in housename_as:
housename=[]
#标题
housename.append(housename_a.get_text())
#超链接
housename.append(housename_a.get('href'))
house.append(housename)
huseinfo_divs = soup.findall('div',class='houseInfo')
for i in range(len(huseinfo_divs)):
info = huseinfo_divs[i].get_text()
infos = info.split('|')
#小区称号
house[i].append(infos[0])
#户型
house[i].append(infos[1])
#平米
house[i].append(infos[2])
#查询总价
house_prices = soup.findall('div',class='totalPrice')
for i in range(len(house_prices)):
#价钱
price = house_prices[i].get_text()
house[i].append(price)
return house
#爬取房屋细致信息：所在区域、套内面积
def houseinfo(url):
headers = {'User-Agent':'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.71 Safari/537.1 LBBROWSER'}
res = requests.get(url,headers=headers)
soup = BeautifulSoup(res.content,'html.parser')
msg =[]
#所在区域
areainfos = soup.findall('span',class='info')
for areainfo in areainfos:
#只需求获取第一个a标签的内容即可
area = areainfo.find('a')
if(not area):
continue
hrefStr = area['href']
if(hrefStr.startswith('javascript')):
continue
msg.append(area.get_text())
break
#依据房屋户型计算套内面积
infolist = soup.find_all('div',id='infoList')
num = []
for info in infolist:
cols = info.findall('div',class='col')
for i in cols:
pingmi = i.get_text()
try:
a = float(pingmi[:-2])
num.append(a)
except ValueError:
continue
msg.append(sum(num))
return msg
#将房源信息写入excel文件
def writeExcel(excelPath,houses):
workbook = xlwt.Workbook()
#获取第一个sheet页
sheet = workbook.add_sheet('git')
row0=['标题','链接地址','户型','面积','朝向','总价','所属区域','套内面积']
for i in range(0,len(row0)):
sheet.write(0,i,row0[i])
for i in range(0,len(houses)):
house = houses[i]
print(house)
for j in range(0,len(house)):
sheet.write(i+1,j,house[j])
workbook.save(excelPath)
#主函数
def main():