title: robobrowser login into a form without id or class
body: <p>i have a problem to login into a site:</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;form action="/shop//loginshop.php" method="POST"&gt;
              &lt;input type="hidden" name="weiter" value="/shop//index.php"&gt;
              &lt;fieldset&gt;
                &lt;label for="kdnr"&gt;KDNR.&lt;/label&gt;&lt;input type="text" id="kdnr" name="user"&gt;&lt;br&gt;
            &lt;label for="pwd"&gt;PASS&lt;/label&gt;&lt;input type="password" name="pw" id="pwd" maxlength="16"&gt;&lt;br&gt;
                &lt;input name="login" class="login" type="submit" value="login"&gt;
              &lt;/fieldset&gt;
              &lt;/form&gt;</code></pre>
  </div>
  </div>
  
  How i can get this Form withou id and class
  i tryit with the</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>from robobrowser import RoboBrowser
  import re
  
  #Browse
  browser = RoboBrowser(user_agent='Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.6) Gecko/20070725 Firefox/2.0.0.6')
  browser.open(url)
  
  form = browser.get_form(id='tab_login')
  form['login'] = '/shop//loginshop.php'
  form['user'] = 'my_user'
  form['pw'] = 'my_pass'
  browser.submit_form(form)</code></pre>
  </div>
  </div>
  </p>
  
  <p>Maybe someone know how to do it. i checked the documentation from robobrowser but nothing, every example was with id or class... Thx</p>