Your Smart IOT

<p><em>Web crawler is a program that browses the Internet (World Wide Web) in a predetermined, configurable and automated manner and performs given action on crawled content. Search engines like Google and Yahoo use spidering as a means of providing up-to-date data.</em></p>
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<p><a href="http://blog.webhose.io/" rel="nofollow" target="_blank"><span class="su-dropcap su-dropcap-style-default">W</span>ebhose.io</a>, a company which provides direct access to live data from hundreds of thousands of forums, news and blogs, on Aug 12, 2015, posted the articles describing a tiny, multi-threaded web crawler written in <a href="http://ift.tt/1p52vkK" itemprop="url" target="_bank" title="Raspberry Pi GPIO Pins and Python"><strong>python</strong></a>. This <a href="http://ift.tt/1NdIFPV" itemprop="url" target="_bank" title="How to Build a Basic Web Crawler in Python"><strong>python</strong></a> web crawler is capable of crawling the entire web for you. Ran Geva, the author of this tiny python web crawler says that:</p>
<blockquote>
<p>I wrote as “Dirty”, “Iffy”, “Bad”, “Not very good”. I say, it gets the job done and downloads thousands of pages from multiple pages in a matter of hours. No setup is required, no external imports, just run the following python code with a seed site and sit back (or go do something else because it could take a few hours, or days depending on how much data you need).</p>
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<p>The python based multi-threaded crawler is pretty simple and very fast. It is capable of detecting and eliminating duplicate links and saving both source and link which can later be used in finding inbound and outbound links for calculating page rank. It is completely free and the code is listed below:</p>
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<p><span class="crayon-language">Python</span></p>
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<div id="crayon-571149b266973174913966-1" class="crayon-line"><span class="crayon-r">import</span> <span class="crayon-k">sys</span><span class="crayon-sy">,</span> <span class="crayon-k">thread</span><span class="crayon-sy">,</span> <span class="crayon-k">Queue</span><span class="crayon-sy">,</span> <span class="crayon-k">re</span><span class="crayon-sy">,</span> <span class="crayon-k">urllib</span><span class="crayon-sy">,</span> <span class="crayon-k">urlparse</span><span class="crayon-sy">,</span> <span class="crayon-k">time</span><span class="crayon-sy">,</span> <span class="crayon-k">os</span><span class="crayon-sy">,</span> <span class="crayon-k">sys</span></div>
<div id="crayon-571149b266973174913966-2" class="crayon-line crayon-striped-line"><span class="crayon-v">dupcheck</span> <span class="crayon-o">=</span> <span class="crayon-k">set</span><span class="crayon-sy">(</span><span class="crayon-sy">)</span><span class="crayon-h">  </span></div>
<div id="crayon-571149b266973174913966-3" class="crayon-line"><span class="crayon-v">q</span> <span class="crayon-o">=</span> <span class="crayon-k">Queue</span><span class="crayon-sy">.</span><span class="crayon-k">Queue</span><span class="crayon-sy">(</span><span class="crayon-cn">100</span><span class="crayon-sy">)</span></div>
<div id="crayon-571149b266973174913966-4" class="crayon-line crayon-striped-line"><span class="crayon-v">q</span><span class="crayon-sy">.</span><span class="crayon-e">put</span><span class="crayon-sy">(</span><span class="crayon-k">sys</span><span class="crayon-sy">.</span><span class="crayon-v">argv</span><span class="crayon-sy">[</span><span class="crayon-cn">1</span><span class="crayon-sy">]</span><span class="crayon-sy">)</span></div>
<div id="crayon-571149b266973174913966-5" class="crayon-line"><span class="crayon-r">def</span> <span class="crayon-e">queueURLs</span><span class="crayon-sy">(</span><span class="crayon-v">html</span><span class="crayon-sy">,</span> <span class="crayon-v">origLink</span><span class="crayon-sy">)</span><span class="crayon-o">:</span></div>
<div id="crayon-571149b266973174913966-6" class="crayon-line crayon-striped-line"><span class="crayon-h">    </span><span class="crayon-st">for</span> <span class="crayon-e">url</span> <span class="crayon-st">in</span> <span class="crayon-k">re</span><span class="crayon-sy">.</span><span class="crayon-e">findall</span><span class="crayon-sy">(</span><span class="crayon-s">”'<a[^>]+href=[“‘](.[^”‘]+)[“‘]”’</span><span class="crayon-sy">,</span> <span class="crayon-v">html</span><span class="crayon-sy">,</span> <span class="crayon-k">re</span><span class="crayon-sy">.</span><span class="crayon-v">I</span><span class="crayon-sy">)</span><span class="crayon-o">:</span></div>
<div id="crayon-571149b266973174913966-7" class="crayon-line"><span class="crayon-h">        </span><span class="crayon-v">link</span> <span class="crayon-o">=</span> <span class="crayon-v">url</span><span class="crayon-sy">.</span><span class="crayon-e">split</span><span class="crayon-sy">(</span><span class="crayon-s">“#”</span><span class="crayon-sy">,</span> <span class="crayon-cn">1</span><span class="crayon-sy">)</span><span class="crayon-sy">[</span><span class="crayon-cn">0</span><span class="crayon-sy">]</span> <span class="crayon-st">if</span> <span class="crayon-v">url</span><span class="crayon-sy">.</span><span class="crayon-e">startswith</span><span class="crayon-sy">(</span><span class="crayon-s">“http”</span><span class="crayon-sy">)</span> <span class="crayon-st">else</span> <span class="crayon-s">‘{uri.scheme}://{uri.netloc}’</span><span class="crayon-sy">.</span><span class="crayon-k">format</span><span class="crayon-sy">(</span><span class="crayon-v">uri</span><span class="crayon-o">=</span><span class="crayon-k">urlparse</span><span class="crayon-sy">.</span><span class="crayon-k">urlparse</span><span class="crayon-sy">(</span><span class="crayon-v">origLink</span><span class="crayon-sy">)</span><span class="crayon-sy">)</span> <span class="crayon-o">+</span> <span class="crayon-v">url</span><span class="crayon-sy">.</span><span class="crayon-e">split</span><span class="crayon-sy">(</span><span class="crayon-s">“#”</span><span class="crayon-sy">,</span> <span class="crayon-cn">1</span><span class="crayon-sy">)</span><span class="crayon-sy">[</span><span class="crayon-cn">0</span><span class="crayon-sy">]</span></div>
<div id="crayon-571149b266973174913966-8" class="crayon-line crayon-striped-line"><span class="crayon-h">        </span><span class="crayon-st">if</span> <span class="crayon-e">link</span> <span class="crayon-st">in</span> <span class="crayon-v">dupcheck</span><span class="crayon-o">:</span></div>
<div id="crayon-571149b266973174913966-9" class="crayon-line"><span class="crayon-h">            </span><span class="crayon-st">continue</span></div>
<div id="crayon-571149b266973174913966-10" class="crayon-line crayon-striped-line"><span class="crayon-h">        </span><span class="crayon-v">dupcheck</span><span class="crayon-sy">.</span><span class="crayon-e">add</span><span class="crayon-sy">(</span><span class="crayon-v">link</span><span class="crayon-sy">)</span></div>
<div id="crayon-571149b266973174913966-11" class="crayon-line"><span class="crayon-h">        </span><span class="crayon-st">if</span> <span class="crayon-k">len</span><span class="crayon-sy">(</span><span class="crayon-v">dupcheck</span><span class="crayon-sy">)</span> <span class="crayon-o">></span> <span class="crayon-cn">99999</span><span class="crayon-o">:</span></div>
<div id="crayon-571149b266973174913966-12" class="crayon-line crayon-striped-line"><span class="crayon-h">            </span><span class="crayon-v">dupcheck</span><span class="crayon-sy">.</span><span class="crayon-e">clear</span><span class="crayon-sy">(</span><span class="crayon-sy">)</span></div>
<div id="crayon-571149b266973174913966-13" class="crayon-line"><span class="crayon-h">        </span><span class="crayon-v">q</span><span class="crayon-sy">.</span><span class="crayon-e">put</span><span class="crayon-sy">(</span><span class="crayon-v">link</span><span class="crayon-sy">)</span></div>
<div id="crayon-571149b266973174913966-14" class="crayon-line crayon-striped-line"><span class="crayon-r">def</span> <span class="crayon-e">getHTML</span><span class="crayon-sy">(</span><span class="crayon-v">link</span><span class="crayon-sy">)</span><span class="crayon-o">:</span></div>
<div id="crayon-571149b266973174913966-15" class="crayon-line"><span class="crayon-h">    </span><span class="crayon-st">try</span><span class="crayon-o">:</span></div>
<div id="crayon-571149b266973174913966-16" class="crayon-line crayon-striped-line"><span class="crayon-h">        </span><span class="crayon-v">html</span> <span class="crayon-o">=</span> <span class="crayon-k">urllib</span><span class="crayon-sy">.</span><span class="crayon-e">urlopen</span><span class="crayon-sy">(</span><span class="crayon-v">link</span><span class="crayon-sy">)</span><span class="crayon-sy">.</span><span class="crayon-e">read</span><span class="crayon-sy">(</span><span class="crayon-sy">)</span></div>
<div id="crayon-571149b266973174913966-17" class="crayon-line"><span class="crayon-h">        </span><span class="crayon-k">open</span><span class="crayon-sy">(</span><span class="crayon-k">str</span><span class="crayon-sy">(</span><span class="crayon-k">time</span><span class="crayon-sy">.</span><span class="crayon-k">time</span><span class="crayon-sy">(</span><span class="crayon-sy">)</span><span class="crayon-sy">)</span> <span class="crayon-o">+</span> <span class="crayon-s">“.html”</span><span class="crayon-sy">,</span> <span class="crayon-s">“w”</span><span class="crayon-sy">)</span><span class="crayon-sy">.</span><span class="crayon-e">write</span><span class="crayon-sy">(</span><span class="crayon-s">“”</span> <span class="crayon-o">%</span> <span class="crayon-v">link</span><span class="crayon-h">  </span><span class="crayon-o">+</span> <span class="crayon-s">“\n”</span> <span class="crayon-o">+</span> <span class="crayon-v">html</span><span class="crayon-sy">)</span></div>
<div id="crayon-571149b266973174913966-18" class="crayon-line crayon-striped-line"><span class="crayon-h">        </span><span class="crayon-e">queueURLs</span><span class="crayon-sy">(</span><span class="crayon-v">html</span><span class="crayon-sy">,</span> <span class="crayon-v">link</span><span class="crayon-sy">)</span></div>
<div id="crayon-571149b266973174913966-19" class="crayon-line"><span class="crayon-h">    </span><span class="crayon-st">except</span> <span class="crayon-sy">(</span><span class="crayon-k">KeyboardInterrupt</span><span class="crayon-sy">,</span> <span class="crayon-k">SystemExit</span><span class="crayon-sy">)</span><span class="crayon-o">:</span></div>
<div id="crayon-571149b266973174913966-20" class="crayon-line crayon-striped-line"><span class="crayon-h">        </span><span class="crayon-st">raise</span></div>
<div id="crayon-571149b266973174913966-21" class="crayon-line"><span class="crayon-h">    </span><span class="crayon-st">except</span> <span class="crayon-k">Exception</span><span class="crayon-o">:</span></div>
<div id="crayon-571149b266973174913966-22" class="crayon-line crayon-striped-line"><span class="crayon-h">        </span><span class="crayon-r">pass</span></div>
<div id="crayon-571149b266973174913966-23" class="crayon-line"><span class="crayon-st">while</span> <span class="crayon-t">True</span><span class="crayon-o">:</span></div>
<div id="crayon-571149b266973174913966-24" class="crayon-line crayon-striped-line"><span class="crayon-h">    </span><span class="crayon-k">thread</span><span class="crayon-sy">.</span><span class="crayon-e">start_new_thread</span><span class="crayon-sy">(</span> <span class="crayon-v">getHTML</span><span class="crayon-sy">,</span> <span class="crayon-sy">(</span><span class="crayon-v">q</span><span class="crayon-sy">.</span><span class="crayon-e">get</span><span class="crayon-sy">(</span><span class="crayon-sy">)</span><span class="crayon-sy">,</span><span class="crayon-sy">)</span><span class="crayon-sy">)</span></div>
<div id="crayon-571149b266973174913966-25" class="crayon-line"><span class="crayon-h">    </span><span class="crayon-k">time</span><span class="crayon-sy">.</span><span class="crayon-e">sleep</span><span class="crayon-sy">(</span><span class="crayon-cn">0.5</span><span class="crayon-sy">)</span></div>
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<p>Save the above code with some name lets say “<span class="skimlinks-unlinked">myPythonCrawler.py</span>”. To start crawling any website just type:</p>
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<p><span class="crayon-language">Python</span></p>
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<div id="crayon-571149b26698a247914104-1" class="crayon-line"><span class="crayon-sy">$</span> <span class="crayon-e">python</span> <span class="crayon-v">myPythonCrawler</span><span class="crayon-sy">.</span><span class="crayon-e">py</span> <span class="crayon-v">http</span><span class="crayon-o">:</span><span class="crayon-o">/</span><span class="crayon-o">/</span><span class="crayon-v">fossbytes</span><span class="crayon-sy">.</span><span class="crayon-v">com</span></div>
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<p>Sit back and enjoy this web crawler in python. It will download the entire site for you.</p>
<p>Do you like this dead simple python based multi-threaded web crawler? Let us know in comments.</p>
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How to Build a Basic Web Crawler in Python

Web crawler is a program that browses the Internet (World Wide Web) in a predetermined, configurable and automated manner and performs given...

How to Build a Basic Web Crawler in Python

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