title: Python xpath => SyntaxError: invalid syntax
body: <p>I am a newbie to python. I'm trying to crawl some text, but it doesn't work...
  Here is my code </p>
  
  <pre><code>    def parse(self,response):
  
      hxs = Selector(response)
      article_list = hsx.xpath('//*[@id="weather"]')
  
      print('##################### total_length : ' + str(len(article_list)))
  
      for a in article_list:
          html_response = HtmlResponse(uurl="", body=a.encode('utf-8') #??
          seoul = html_response.xpath('//dl[@class="po_seoul"]//dd[@class="temp"]')[0].extract()
  </code></pre>
  
  <p>and this is the html code.</p>
  
  <pre><code>            &lt;h1 class="blind"&gt;weather_data&lt;/h1&gt;
              &lt;div id="weather" class="weather" &gt;
                  &lt;dl class="po_seoul"&gt;
                      &lt;dt&gt;seoul&lt;/dt&gt;
                      &lt;dd class="weather"&gt;&lt;a href="#" onclick="showLandForecast('1159068000'); return false;" data-stn="108"&gt;&lt;img src="/images/icon/NW/NB04.png" alt="cloud" /&gt;&lt;/a&gt;&lt;/dd&gt;
                      &lt;dt class="blind"&gt;temperature&lt;/dt&gt;
                      &lt;dd class="temp"&gt;21.2&lt;/dd&gt;
                  &lt;/dl&gt;
  </code></pre>
  
  <p>Error message:</p>
  
  <p><code>
  seoul = html_response.xpath('//dl[@class="po_seoul"]//dd[@class="temp"]')[0].extract()
          ^
  SyntaxError: invalid syntax</code></p>
  
  <p>plz help me...T0T</p>