使用beautifulsoup从多个网址刮痧

时间:2013-09-16 06:10:30

标签: python python-2.7 beautifulsoup

我的代码正常运行。现在我想做一些修改以从多个URL获取日期,但URL只有一个字差异。

这是我的代码,我只从一个网址获取。

from string import punctuation, whitespace
import urllib2
import datetime
import re
from bs4 import BeautifulSoup as Soup
import csv
today = datetime.date.today()
html = urllib2.urlopen("http://www.99acres.com/property-in-velachery-chennai-south-ffid").read()

soup = Soup(html)
print "INSERT INTO `property` (`date`,`Url`,`Rooms`,`place`,`PId`,`Phonenumber1`,`Phonenumber2`,`Phonenumber3`,`Typeofperson`,` Nameofperson`,`typeofproperty`,`Sq.Ft`,`PerSq.Ft`,`AdDate`,`AdYear`)"
print 'VALUES'
re_digit = re.compile('(\d+)')
properties = soup.findAll('a', title=re.compile('Bedroom'))

for eachproperty in soup.findAll('div', {'class':'sT'}):
  a      = eachproperty.find('a', title=re.compile('Bedroom'))
  pdate  = eachproperty.find('i', {'class':'pdate'})
  pdates = re.sub('(\s{2,})', ' ', pdate.text)
  div    = eachproperty.find('div', {'class': 'sT_disc grey'})
  try:
    project = div.find('span').find('b').text.strip()
  except:
    project = 'NULL'        
  area = re.findall(re_digit, div.find('i', {'class': 'blk'}).text.strip())
  print ' ('
  print today,","+ (a['href'] if a else '`NULL`')+",", (a.string if a else 'NULL, NULL')+ "," +",".join(re.findall("'([a-zA-Z0-9,\s]*)'", (a['onclick'] if a else 'NULL, NULL, NULL, NULL, NULL, NULL')))+","+ ", ".join([project] + area),","+pdates+""
  print ' ), '

以下是我想要同时获取的网址

http://www.99acres.com/property-in-velachery-chennai-south-ffid
http://www.99acres.com/property-in-thoraipakkam-chennai-south-ffid
http://www.99acres.com/property-in-madipakkam-chennai-south-ffid

因此,您可以看到每个网址中只有一个字不同。

我正在尝试创建一个类似于以下

的数组
for locality in areas (http://www.99acres.com/property-in-velachery-chennai-south-ffid
, http://www.99acres.com/property-in-thoraipakkam-chennai-south-ffid,    http://www.99acres.com/property-in-madipakkam-chennai-south-ffid):
link = "str(locality)"
html = urllib2.urlopen(link)
soup = Soup(html)

这似乎不起作用,我实际上只想把这个单词传递给这样的URL

for locality in areas(madipakkam, thoraipakkam, velachery):
    link = “http://www.99acres.com/property-in-+ str(locality)+-chennai-south-ffid"
    html= urllib2.urlopen(link)
    soup = BeautifulSoup(html)

希望我说清楚

1 个答案:

答案 0 :(得分:2)

此:

for locality in areas (http://www.99acres.com/property-in-velachery-chennai-south-ffid, http://www.99acres.com/property-in-thoraipakkam-chennai-south-ffid,    http://www.99acres.com/property-in-madipakkam-chennai-south-ffid):
link = "str(locality)"
由于种种原因,

......不会起作用。

首先,您正在调用一个您从未在任何地方定义过的areas函数。而且我不确定你对这个功能的期望是什么。

其次,你试图传递http://www.99acres.com/property-in-velachery-chennai-south-ffid,好像它是一个有意义的Python表达式,当它甚至不可解析时。如果你想传递一个字符串,你必须把它放在引号中。

第三,"str(locality)"是文字字符串str(locality)。如果您想在str变量上调用locality函数,请不要在其周围加上引号。但实际上,根本没有理由打电话给str; locality 已经一个字符串。

最后,你没有缩进for循环的主体。你必须缩进link =行,以及你以前在顶级做的所有内容,以便它属于for。这样,它对循环中的每个值都会发生一次,而不是在所有循环完成后只发生一次。

试试这个:

for link in ("http://www.99acres.com/property-in-velachery-chennai-south-ffid",
             "http://www.99acres.com/property-in-thoraipakkam-chennai-south-ffid",
             "http://www.99acres.com/property-in-madipakkam-chennai-south-ffid"):
    # all the stuff you do for each URL

你走在正确的轨道上:

for locality in areas(madipakkam, thoraipakkam, velachery):
link = “http://www.99acres.com/property-in-+ str(locality)+-chennai-south-ffid"

使用“模板字符串”以避免重复自己几乎总是一个好主意。

但同样,还有很多问题。

首先,你再次调用了一个不存在的areas函数,并尝试使用没有引号的裸字符串。

其次,你遇到了与上一个相反的问题:你试图将要评估的表达式+str(locality)放入字符串的中间。您需要将其分解为两个单独的字符串,这些字符串可以是+表达式的一部分。

同样,你没有缩进循环体,而且你不必要地调用str

所以:

for locality in "velachery", "thoraipakkam", "madipakkam":
    link = “http://www.99acres.com/property-in-" + locality + "-chennai-south-ffid"
    # all the stuff you do for each URL

当我们使用它时,通常使用格式化函数而不是尝试将字符串连接在一起时,更容易阅读代码,并且更容易确保没有出错。例如:

for locality in "velachery", "thoraipakkam", "madipakkam":
    link = "http://www.99acres.com/property-in-{}-chennai-south-ffid".format(locality)
    # all the stuff you do for each URL

在这里,很明显每个位置适合字符串的位置,字符串的外观,连字符的位置,等等。