python - django static files - don't work -

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i have django project , i'm using static files, didn't work , can not include css file or image html file

here 

<link rel="icon" href={% static "img/favicon.png" %}>

or

<link href={% static "css/mine.css" %} rel="stylesheet">

i checked direction , ok cant understand why code didn't work

i add static section in settings.py follows

static_url = '/static/'

just change this

<link rel="icon" href="{% static "img/favicon.png" %}">

and

<link href="{% static "css/mine.css" %}" rel="stylesheet">

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