[Python] How to decode a url string in a flask template

I am using flask.

In my template I used this to encode a string.

encodeURIComponent(mytag)


Now I want to decode in another template.
Where is what the string looks like.

%26lt%3B!--Afff%20Tracking%20Tag--%26gt%3B%0A%26lt%3Bimg%20src%3D%22http%3A%2F%2Fcm.g.doubleclick.net%2Fpixel%3F%0Agggg_nid%3Dhff%26gggg_cm%26avid%3David3966173574%26campaign_id%3Dundefined%22%20%2F%26gt%3B


In the template how do I decode the string?

{% for crid, object in tag_handler.iteritems() %}
<script>var x = decodeURI("{{object['tag_display']}}"); alert(x);</script>
<div id="tagBox" style="display: block;width: 700px">
<pre class="prettyprint">
<code class="language-html">
{{object['tag_display']}}
</code>
</pre>
</div>

{% endfor %}


I am using google pretty to display the string.

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