django serving static css files - django

Question

I am relatively new to Django development.I have a css file inside a /static/css directory.
When I try to run the url no CSS is applied to my template. the python manage.py runserver window shows following error
[01/Jan/2013 20:00:40] "GET /home/prat/PROJECT_ROOT/SOURCE_ROOT/static/css/Style.css HTTP/1.1" 404 2207
Can someone please point me how to debug this. I have read multiple stackoverflow questions and added the following setting in my settings.py.
PROJECT_R = os.path.abspath(os.path.dirname(__name__))
PROJEECT_R = PROJECT_R + "../"
STATIC_ROOT = os.path.join(PROJECT_R, "static")
STATIC_URL = 'static/'
.
├── manage.py
├── README
├── SOURCE_ROOT
│   ├── __init__.py
│   ├── __init__.pyc
│   ├── settings.py
│   ├── settings.pyc
│   ├── urls.py
│   ├── urls.pyc
│   ├── wsgi.py
│   └── wsgi.pyc
├── static
│   ├── css
│   │   ├── README
│   │   └── Style.css
│   ├── images
│   │   └── README
│   └── js
│   └── README
├── template
│   ├── base.html

Answer 1

Here's how I usually go about managing dynamic project root:
from os.path import dirname, realpath, join
PROJECT_ROOT = dirname(realpath(__file__))
And then further below, the static root:
STATIC_ROOT = join(PROJECT_ROOT, 'static/')
And then you reference static files like so:
{{ STATIC_URL }}css/Style.css
EDIT:
See the documentation for more information.