title: How to create a lambda for assignment?
body: <p>I just to pass something like:</p>
  
  <pre><code>def ___(x):
      x.a=0
      return x
  </code></pre>
  
  <p>or </p>
  
  <pre><code>def ___(x):
      x.a=0
  </code></pre>
  
  <p>into a function. How to make it happen?</p>