how to refer to js files in script in flask code example

Example 1: css and js on flask

<!-- Put in HTML file--> 

<!-- 
JS
parent_dir is reletive to Flask app.py dir
meaning: /main/app.py
		 /main/parent_dir/file.js
-->
<script src="{{url_for('parent_dir', filename='file.js')}}"></script>

<!-- 
CSS
parent_dir is reletive to Flask app.py dir
meaning: /main/app.py
		 /main/parent_dir/file.css
-->
        <link href="{{ url_for("parent_dir",filename="file.css")  }}" rel="stylesheet">

Example 2: how to add js in flask

<script src="{{url_for('static', filename='js/modernizr-2.6.2.min.js')}}"></script>

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Python Example

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