Storing URLs while Spidering

Posted by itemio on Stack Overflow See other posts from Stack Overflow or by itemio
Published on 2010-04-11T02:19:52Z Indexed on 2010/04/11 2:23 UTC
Read the original article Hit count: 448

Filed under:

python

|

spider

|

database

|

storage

|

url

I created a little web spider in python which I'm using to collect URLs. I'm not interested in the content. Right now I'm keeping all the visited URLs in a set in memory, because I don't want my spider to visit URLs twice. Of course that's a very limited way of accomplishing this.

So what's the best way to keep track of my visited URLs?

Should I use a database? * which one? MySQL, sqlite, postgre? * how should I save the URLs? As a primary key trying to insert every URL before visiting it?

Or should I write them to a file? * one file? * multiple files? how should I design the file-structure?

I'm sure there are books and a lot of papers on this or similar topics. Can you give me some advice what I should read?

© Stack Overflow or respective owner

Related posts about python

unmet dependencies in Ubuntu 12.04

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I tried today to install a dvb-card on my Ubuntu 12.04 (Linux blauhai-linux 3.2.0-25-generic #40-Ubuntu SMP Wed May 23 20:30:51 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux ). The installation failed with an error. After that, i tried to install python (it was already installed but i got this error): linux:~$… >>> More
How can I get sikuli-ide to work?

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I installed sikuli-ide with sudo apt-get install sikuli-ide Everything was fine until I tried to start it from the terminal. I typed sikuli-ide But the only response I got was [info] locale: en_US The application was not started, furthermore there is no desktop file and sikuli-ide does not… >>> More
Getting PATH right for python after MacPorts install

as seen on Super User - Search for 'Super User'
I can't import some python libraries (PIL, psycopg2) that I just installed with MacPorts. I looked through these forums, and tried to adjust my PATH variable in $HOME/.bash_profile in order to fix this but it did not work. I added the location of PIL and psycopg2 to PATH. I know that Terminal is… >>> More
call python with system() in R to run a python script emulating the python console

as seen on Stack Overflow - Search for 'Stack Overflow'
I want to pass a chunk of Python code to Python in R with something like system('python ...'), and I'm wondering if there is an easy way to emulate the python console in this case. For example, suppose the code is "print 'hello world'", how can I get the output like this in R? >>> print… >>> More
Python - Calling a non python program from python?

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I am currently struggling to call a non python program from a python script. I have a ~1000 files that when passed through this C++ program will generate ~1000 outputs. Each output file must have a distinct name. The command I wish to run is of the form: program_name -input -output -o1 -o2… >>> More

Related posts about spider

Creating a spider using Scrapy, Spider generation error.

as seen on Stack Overflow - Search for 'Stack Overflow'
I just downloaded Scrapy (web crawler) on Windows 32 and have just created a new project folder using the "scrapy-ctl.py startproject dmoz" command in dos. I then proceeded to created the first spider using the command: scrapy-ctl.py genspider myspider myspdier-domain.com but it did not work and… >>> More
Site crawler/spider that tosses results into mysql

as seen on Server Fault - Search for 'Server Fault'
It's been suggested that we use mysql for our site's search as it'd be running on the same server that hosts our web server (nginx) and our db (mysql). Since not all of our pages are created from the database, it's been suggested that we have a crawler that can crawl the site, and toss the page url… >>> More
Getting Started with Python: Attribute Error

as seen on Stack Overflow - Search for 'Stack Overflow'
I am new to python and just downloaded it today. I am using it to work on a web spider, so to test it out and make sure everything was working, I downloaded a sample code. Unfortunately, it does not work and gives me the error: "AttributeError: 'MyShell' object has no attribute 'loaded' " I am… >>> More
How to create a web crawler/spider/robot?

as seen on Stack Overflow - Search for 'Stack Overflow'
Is there a way to make a web robot like websiteoutlook.com does? I need something that searches the internet for URLs only...I don't need links, descriptions, etc. What is the best way to do this without getting too technical? I guess it could even be a cronjob that runs a PHP script grabbing URLs… >>> More
How do I block a user-agent from Apache

as seen on Pro Webmasters - Search for 'Pro Webmasters'
How do I realize a UA string block by regular expression in the config files of my Apache webserver? For example: if I would like to block out all bots from Apache on my debian server, that have the regular expression /\b\w+[Bb]ot\b/ or /Spider/ in their user-agent. Those bots should not be able… >>> More