title: Django/Python Where to find a list of available filter functions when querying
body: <p>I'm currently working with a Python Django project and in there I filter data from PostgreSQL where I need to find the functions that can be called after each field followed by two underscores.</p>
  
  <p>Ex:</p>
  
  <ul>
  <li>birthday__year, birthday__month </li>
  <li>start_time__hour, start_time__seconds</li>
  <li>salary__gte, salary__lt</li>
  </ul>
  
  <p>Like wise from where can we get a list of all possibilities (except for foreign key fields) that can be called through the TestObj.objects.filter() ?</p>