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07.16.2008 at 07:27AM PDT, ID: 23569782
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9.5

avoid downloading the same page twice

Asked by catalini in Python Scripting Language, Perl Programming Language

Tags:

I'm using this script to download data from a website. I would like to avoid downloading the same page twice, how do I need to fix the code?
(i.e. everytime link1 has been already link1 or link2 have already been downloaded, it should skip them).

see http://www.experts-exchange.com/Programming/Languages/Scripting/Perl/Q_23527220.html

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import re
from urllib import urlopen
 
def links(html):
    for a in re.findall(r"href=([^ >]+)", html, re.I):
        if a.startswith('"'): a = a[1:-1]
        yield a
 
count = 1        
for start in xrange(0, 9000, 10):
    m = urlopen("http://www.domain.com/search/?offset=%s" % start).read()
    open("search_%04d.htm" % count, "w").write(m)
    count += 1
    
    for link1 in links(m):
        if re.match(r".*&sort=progress", link1):
            link1 = link1.replace('&sort=alphab', '')
            link1 = 'http://www.domain.com' + link1
            m = urlopen(link1).read()
            open("index_%04d.htm" % count, "w").write(m)
            count += 1
            for link2 in links(m):
                if re.match(r"http://www.domain.com/pages/.*", link2):
                    m = urlopen(link2).read()
                    open("pages_%04d.htm" % count, "w").write(m)
                    count += 1
[+][-]07.16.2008 at 08:29AM PDT, ID: 22016901

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About this solution

Zones: Python Scripting Language, Perl Programming Language
Tags: python, perl
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Solution Provided By: ramrom
Participating Experts: 1
Solution Grade: A
 
 
[+][-]07.16.2008 at 08:51AM PDT, ID: 22017146

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[+][-]07.16.2008 at 09:04AM PDT, ID: 22017301

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