title: Python, what does an underscore before parenthesis do
body: <p>Looking through some of the Django code at authentication forms I noticed the following syntax</p>
  
  <pre><code>label=_("Username")
  </code></pre>
  
  <p>Normally I would have just used a pair of quotes around the string. Can someone exaplain to me what the underscore and parenthesis around "Username" do?</p>