title: Switch back to parent tab using selenium webdriver
body: <p>I wrote sample code but it is not working. Also observed that there is only 1 window handle for 2 tabs. How to switch to parent tab again?</p>
  
  <pre><code> driver = webdriver.Firefox()
   driver.set_page_load_timeout(60)
   driver.implicitly_wait(15)
   driver.get("https://www.google.co.in")
   oldtab = driver.current_window_handle
   print oldtab
   print driver.title
   body = driver.find_element_by_tag_name("body")
   print 'new tab opened'
   driver.get("http://gmail.com/")
   print driver.title
   print 'back to old tab'
   driver.switch_to_window(oldtab)
   print driver.title
   for handle in driver.window_handles:
      print "Handle = ",handle
  </code></pre>