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You are trying to include a complete directory into your HTML, which is impossible. You should adjust the path in {% static 'bootstrap-3.3.7' %}
to the location of the actual file you need.
<script src="{% static 'bootstrap-3.3.7/dist/js/boostrap.min.js' %}"></script>
Note, don’t forget to add the css file too, you need to include them both individually. Which will probably be:
<link rel="stylesheet" type="text/css" href="{% static 'bootstrap-3.3.7/dist/css/boostrap.min.css' %}"/>
Source:stackexchange.com