title: How to extract information with Xpath in python scrapy
body: <p>i need some help to extract a part of information from html page with xpath! i wanna extract the review's rating 
  exemple : this is the <code>HTML</code> code </p>
  
  <pre><code>&lt;div id="BVRRRatingOverall_Rating_Summary_1" class="BVRRRating BVRRRatingNormal BVRRRatingOverall"&gt;
  &lt;div class="BVRRLabel BVRRRatingNormalLabel"&gt;Overall rating&amp;nbsp;&lt;/div&gt;
  &lt;div class="BVRRRatingNormalImage"&gt;&lt;img src="/4_9/5/rating.gif" class="BVImgOrSprite" alt="4.9 out of 5" title="4.9 out of 5" width="85" height="16"&gt;&lt;/div&gt;
  &lt;span itemprop="aggregateRating" itemscope="" itemtype="http://schema.org/AggregateRating" class="BVRRRatingNormalOutOf"&gt;
        &lt;span itemprop="ratingValue" class="BVRRNumber BVRRRatingNumber"&gt;4.9&lt;/span&gt;
        &lt;span class="BVRRSeparatorText"&gt;out of &lt;/span&gt;
        &lt;span itemprop="bestRating" class="BVRRNumber BVRRRatingRangeNumber"&gt;5&lt;/span&gt;
        &lt;meta itemprop="reviewCount" content="23"&gt;
     &lt;/span&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>From this code i wanna display "4.9 out of 5" or 3 variables which contains "4.9" , "out of" , "5" </p>
  
  <p>I used this but it didn't work : </p>
  
  <pre><code>response.xpath('//div[@class="BVRRRatingNormalImage"]/img/@alt').extract()
  </code></pre>
  
  <p>Any help?</p>