Index out of range problems

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March 10th, 2013, 07:39 PM

rbdeforest

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Join Date: Mar 2013

Posts: 5

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Index out of range problems

Hi everyone,

I'm rather new at python programming and teaching myself how via youtube. For one of the tutorials he taught how to fetch stuff from sites called screen scraping. I got the code he gives and it works fine with his example rss feed, but then when I try to do it myself on another feed it says
"print findPatTitle [i] IndexError: list index out of range"

here's the code which results in the error:

Code:

from bs4 import BeautifulSoup
from urllib import urlopen
import re

webpage = urlopen('http://www.kayak.com/h/rss/deals').read()
patFinderTitle = re.compile('<title>(.*)</title>')
findPatTitle = re.findall(patFinderTitle,webpage)

listIterator = []
listIterator[:] = range(2,10)

for i in listIterator:
    print findPatTitle [i]

I just would like to simply know how come the site he provided works, while the one I'm trying does not.

Thanks in advance!

March 10th, 2013, 09:30 PM

b49P23TIvg

Contributing User

Join Date: Aug 2011

Posts: 3,347

Time spent in forums: 1 Month 2 Weeks 3 Days 6 h 53 m 17 sec
Reputation Power: 383

I think you need a better tutorial. The program is too complicated.

Code:

from urllib import urlopen
import re

webpage = urlopen('http://www.kayak.com/h/rss/deals').read()
patFinderTitle = re.compile('<title>(.*)</title>')

titles = patFinderTitle.findall(webpage)

for (i,title,) in enumerate(titles):
    print('title %2d: %s'%(i,title,)

Run this program, you'll see there are 8 titles, indexes 0 through 7. With the crazy list iterator you were trying to access the unavailable indexes 8 and 9 causing, appropriately, IndexError.

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March 11th, 2013, 11:02 PM

rbdeforest

Registered User

Join Date: Mar 2013

Posts: 5

Time spent in forums: 44 m 18 sec
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Perfect

Thanks alot!

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