title: How is the __format__ method supposed to be used for int?
body: <p>I saw there was a <code>__format__</code> method but help(<code>int.__format__</code>) doesn't provide any help.</p>
  
  <p>I also know you're not suppose to call a <code>__method__</code> directly. When is this method called? Which is its argument?</p>