ass_attr_details" class="attr_details">
    <h2>Class Attribute Details</h2>
    
      
      <span id="callback=-class_method"></span>
      <div class="method_details first">
  <h3 class="signature first" id="callback-class_method">
  
    .<strong>callback</strong>  &#x21d2; <tt>Object</tt> 
  

  

  
</h3><div class="docstring">
  <div class="discussion">
    
<p>Returns the value of attribute callback.</p>


  </div>
</div>
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