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POPython: 'Nontype' object has no attribute keys
 

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    <pre><code> def index_dir(self, base_path): num_files_indexed = 0 allfiles = os.listdir(base_path) #print allfiles num_files_indexed = len(allfiles) #print num_files_indexed docnumber = 0 self._inverted_index = {} #dictionary for file in allfiles: self.documents = [base_path+file] #list of all text files f = open(base_path+file, 'r') lines = f.read() # Tokenize the file into words tokens = self.tokenize(lines) docnumber = docnumber + 1 print 'docnumber', docnumber for term in tokens: # check if the key already exists in the dictionary, if yes, # just add a new value for the key #if self._inverted_index.has_key(term) if term in sorted(self._inverted_index.keys()): docnumlist = self._inverted_index.get(term) docnumlist = docnumlist.append(docnumber) else: # if the key doesn't exist in dictionary, add the key (term) # and associate the docnumber value with it. self._inverted_index = self._inverted_index.update({term: docnumber}) #self._inverted_index[term] = docnumber f.close() print 'dictionary', self._inverted_index print 'keys', self._inverted_index.keys() return num_files_indexed </code></pre> <p>I'm working on an information retrieval project where we are supposed to crawl through multiple text file, tokenize the files and store the words in an inverted list (dictionary) data structure. </p> <p>ex: doc1.txt: "the dog ran" doc2.txt: "the cat slept"<br> _inverted_index = { 'the': [0,1], 'dog': [0], 'ran': [0], 'cat': [1], 'slept': [1] } where 0,1 are docIDs</p> <p>I'm getting the following error: 'Nontype' object has no attribute keys. line#95</p> <p>All help is highly appreciated.</p>
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