title: How can i forward declare a class argument in python?
body: <p>When declaring Django models, this problem came across:</p>
  
  <pre><code>class Foo(Bar):
      pass
  
  class Bar():
      pass
  </code></pre>
  
  <blockquote>
    <p>NameError: name 'Bar' is not defined</p>
  </blockquote>
  
  <p><strong>How can i forward declare a class argument in python 3.6.7?</strong></p>