title: Extract positive and negative words from text?
body: <p>I need to find the opinion of certain reviews given in websites. I am using sentiwordnet for this. I first send the file containing all the reviews to POS Tagger.</p>
  
  <p>Is there any other accurate way of tokenizing which considers not good as 1 word other than considering it as 2 separate words.</p>
  
  <p>Now I have to give postive and negative score to the tokenized words and then calculate the total score. Is there any function in sentiwordnet for this. please help.</p>
  
  <pre><code>import nltk
  from not.tokenize import sent_tokenize, word_tokenize
  import CSV
  
  para = "What can I say about this place. The staff of the restaurant is nice and the eggplant is not bad. Apart from that, very uninspired food, lack of atmosphere and too expensive. I am a staunch vegetarian and was sorely disappointed with the veggie options on the menu. Will be the last time I visit, I recommend others to avoid"
  
  sentense = word_tokenize(para)
  word_features = []
  
  for i,j in nltk.pos_tag(sentense):
      if j in ['JJ', 'JJR', 'JJS', 'RB', 'RBR', 'RBS']:
          word_features.append(i)
  
  rating = 0
  
  for i in word_features:
      with open('words.txt', 'rt') as f:
          reader = csv.reader(f, delimiter=',')
          for row in reader:
              if i == row[0]:
                  print i, row[1]
                  if row[1] == 'pos':
                      rating = rating + 1
                  elif row[1] == 'neg':
                      rating = rating - 1
  print  rating
  </code></pre>
  
  <p>Error:</p>
  
  <pre class="lang-none prettyprint-override"><code>Traceback (most recent call last):
    File "E:/Emotional from text/pORnOfWord.py", line 10, in &lt;module&gt;
      for i,j in nltk.pos_tag(sentense):
    File "C:\Python27\lib\site-packages\nltk\tag\__init__.py", line 99, in pos_tag
      tagger = load(_POS_TAGGER)
    File "C:\Python27\lib\site-packages\nltk\data.py", line 605, in load
      resource_val = pickle.load(_open(resource_url))
    File "C:\Python27\lib\site-packages\nltk\data.py", line 686, in _open
      return find(path).open()
    File "C:\Python27\lib\site-packages\nltk\data.py", line 467, in find
      raise LookupError(resource_not_found)
  LookupError:
  **********************************************************************
    Resource 'taggers/maxent_treebank_pos_tagger/english.pickle' not
    found.  Please use the NLTK Downloader to obtain the resource:
    &gt;&gt;&gt; nltk.download()
    Searched in:
      - `enter code here`'C:\\Users\\Eman\x99/nltk_data'
      - 'C:\\nltk_data'
      - 'D:\\nltk_data'
      - 'E:\\nltk_data'
      - 'C:\\Python27\\nltk_data'
      - 'C:\\Python27\\lib\\nltk_data'
      - 'C:\\Users\\Eman\x99\\AppData\\Roaming\\nltk_data'
  </code></pre>