title: Python update inherited dictionary
body: <p>I have class</p>
  <pre><code>class Base:
       filters = {
          'today': '__today'        
      }
  </code></pre>
  <p>and another class</p>
  <pre><code>class Filter(Base):
       new_filters = {
              'yesterday': '__yesterday'        
          }
       filters = {**self.filter, **new_filter}
  </code></pre>
  <p>You may see the <code>filter</code> class above, I tried to add an additional key but it doesn't seem to work,</p>
  <p>Can anyone tell me what is the best way to do it?</p>