title: Selenium's select first_selected_option has no 'value' attribute, how can I add this attribute?
body: <p>Here are my code as below:</p>
  
  <pre><code>twoglink_rate_list = Select(browser.find_element_by_id('opmode'))
  twoglink_rate_value = twoglink_rate_list.first_selected_option.value
  </code></pre>
  
  <p>I got an error from above code:</p>
  
  <blockquote>
    <p>[AttributeError: 'FirefoxWebElement' object has no attribute 'value']</p>
  </blockquote>
  
  <p>If I change to </p>
  
  <pre><code>twoglink_rate_value = twoglink_rate_list.first_selected_option.text
  </code></pre>
  
  <p>I will get its text, but I want to get this option value not its text</p>
  
  <p>where can I add 'value' attribute?</p>