gistfile1.pyw

import os

from django.core.signals import post_delete
from articles.models import Attachment

def cleanup_filesystem(sender, instance):
    """Removes attached files from the filesystem"""

    try:
        os.unlink(instance.attachment.path)
    except OSError:
        # file doesn't exist or permissions are incorrect
        pass

post_delete.connect(cleanup_filesystem, sender=Attachment)