format_average_color.py

def format_result_color(self, obj):
    if obj.media == 'A':
        color = 'green'
    elif obj.media == 'R':
        color = 'red'
    else:
        color = 'orange'
    return '<p style="color: {}">{}</p>'.format(color, obj.media)
format_result_color.allow_tags = True

list_display('format_result_color')