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    <p>For anyone interested, what I did was make a superclass Graph which contained an instance variable __crawled and moved my crawling functions into Graph. Page now only contains attributes describing the page and its related pages. I pickle my instance of Graph which contains all my instances of Page. Here is my code.</p> <pre><code>from urllib import urlopen #from bs4 import BeautifulSoup import re import pickle ###################CLASS GRAPH#################### class Graph(object): def __init__(self,roots = [],crawled = {}): self.__roots = roots self.__crawled = crawled @property def roots(self): return self.__roots @property def crawled(self): return self.__crawled def crawl(self,page,url): if url not in self.__crawled: webpage = urlopen(url).read() patFinderTitle = re.compile('&lt;title&gt;(.*)&lt;/title&gt;') patFinderLink = re.compile('&lt;link rel="canonical" href="([^"]*)" /&gt;') patFinderRelated = re.compile('&lt;li&gt;&lt;a href="([^"]*)"') findPatTitle = re.findall(patFinderTitle, webpage) findPatLink = re.findall(patFinderLink, webpage) findPatRelated = re.findall(patFinderRelated, webpage) newPage = Page(findPatTitle,findPatLink,findPatRelated) page.related.append(newPage) self.__crawled[url] = newPage else: page.related.append(self.__crawled[url]) def crawlRelated(self,page): for link in page.relatedURLs: self.crawl(page,link) def crawlAll(self,obj,limit = 2,i = 0): print 'number of crawled pages:', len(self.crawled) i += 1 if i &gt; limit: return else: for rel in obj.related: print 'crawling', rel.title self.crawlRelated(rel) for rel2 in obj.related: self.crawlAll(rel2,limit,i) def loadGraph(self,filename): with open(filename,'r') as inf: return pickle.load(inf) def saveGraph(self,obj,filename): with open(filename,'w') as outf: pickle.dump(obj,outf) ###################CLASS PAGE##################### class Page(Graph): def __init__(self, title = '', link = '', relatedURLs = []): self.__title = title self.__link = link self.__relatedURLs = relatedURLs self.__related = [] @property def relatedURLs(self): return self.__relatedURLs @property def title(self): return self.__title @property def related(self): return self.__related ####################### MAIN ###################### def main(seed): print 'doing some work...' webpage = urlopen(seed).read() patFinderTitle = re.compile('&lt;title&gt;(.*)&lt;/title&gt;') patFinderLink = re.compile('&lt;link rel="canonical" href="([^"]*)" /&gt;') patFinderRelated = re.compile('&lt;li&gt;&lt;a href="([^"]*)"') findPatTitle = re.findall(patFinderTitle, webpage) findPatLink = re.findall(patFinderLink, webpage) findPatRelated = re.findall(patFinderRelated, webpage) print 'found the webpage', findPatTitle #root = Page(findPatTitle,findPatLink,findPatRelated) G = Graph([Page(findPatTitle,findPatLink,findPatRelated)]) print 'crawling related...' G.crawlRelated(G.roots[0]) G.crawlAll(G.roots[0]) print 'now saving...' G.saveGraph(G, 'medTwiceGraph.dat') print 'done' return G #####################END MAIN###################### #'http://medtwice.com/am-i-pregnant/' #'medTwiceGraph.dat' #G = main('http://medtwice.com/menopause-overview/') #print G.crawled def loadGraph(filename): with open(filename,'r') as inf: return pickle.load(inf) G = loadGraph('MedTwiceGraph.dat') print G.roots[0].title print G.roots[0].related print G.crawled for key in G.crawled: print G.crawled[key].title </code></pre>
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    1. POClass variable dictionary not saving with pickle.dump in python 2.7
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    1. USJoel Green
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