title: Using template function to each member of array and get it back to array
body: <p>I have list in django template</p>
  <pre><code>{{mylist}}
  </code></pre>
  <p>each items of mylist has string.</p>
  <p>What I want to do is like this.</p>
  <pre><code>{% for i in mylist %}
  {set i = (i | truncatechars:20)}
  {% endif%}
  
  {{mylist | join:&quot;,&quot;}}
  </code></pre>
  <p>Using truncatechars for each member and then join.</p>
  <p>It can be in view.py but I want to this in template.</p>
  <p>Is it possible??</p>