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我想創建一個類的數據抓取文件,我必須刮的數據要求我使用While循環來獲取正確的數據到單獨的數組 - 即狀態和SAT平均等從列表創建字符串的屬性錯誤
但是,一旦我設置了while循環,我認爲正則表達式清除了大部分的HTML標籤從數據壞了,我得到的是一條錯誤:
Attribute Error: 'NoneType' object has no attribute 'groups'
我的代碼是:
import re, util
from BeautifulSoup import BeautifulStoneSoup
# create a comma-delineated file
delim = ", "
#base url for sat data
base = "http://www.usatoday.com/news/education/2007-08-28-sat-table_N.htm"
#get webpage object for site
soup = util.mysoupopen(base)
#get column headings
colCols = soup.findAll("td", {"class":"vaTextBold"})
#get data
dataCols = soup.findAll("td", {"class":"vaText"})
#append data to cols
for i in range(len(dataCols)):
colCols.append(dataCols[i])
#open a csv file to write the data to
fob=open("sat.csv", 'a')
#initiate the 5 arrays
states = []
participate = []
math = []
read = []
write = []
#split into 5 lists for each row
for i in range(len(colCols)):
if i%5 == 0:
states.append(colCols[i])
i=1
while i<=250:
participate.append(colCols[i])
i = i+5
i=2
while i<=250:
math.append(colCols[i])
i = i+5
i=3
while i<=250:
read.append(colCols[i])
i = i+5
i=4
while i<=250:
write.append(colCols[i])
i = i+5
#write data to the file
for i in range(len(states)):
states = str(states[i])
participate = str(participate[i])
math = str(math[i])
read = str(read[i])
write = str(write[i])
#regex to remove html from data scraped
#remove <td> tags
line = re.search(">(.*)<", states).groups()[0] + delim + re.search(">(.*)<", participate).groups()[0]+ delim + re.search(">(.*)<", math).groups()[0] + delim + re.search(">(.*)<", read).groups()[0] + delim + re.search(">(.*)<", write).groups()[0]
#append data point to the file
fob.write(line)
關於爲什麼這個錯誤突然出現的任何想法?正則表達式工作正常,直到我試圖將數據分成不同的列表。我已經嘗試在最後的「for」循環中打印各種字符串,以查看它們中的任何一個對於第一個i值(0)是否爲「無」,但它們都是它們應該是的字符串。
任何幫助將不勝感激!