Handling Image uploading and Delete Old Image in Django

"""
2-May-2012
Creator:Phang Mulianto
Email:[email protected]

Image upload handling in django
To save an uploaded images and rewrite the old image
The image expected is .jpg

The model is Thumbnail with fields :
slug 
image
created
modified

we name the image in the media with slug data

The form created with imgUploadModelForm

"""
def upload_the_image(request):
data = Thumbnail.objects.get(pk=id)
if request.method == 'POST': # If the form has been submitted...
        form = imgUploadModelForm(request.POST,request.FILES,instance=data) # A form bound to the POST data
        if form.is_valid(): # All validation rules pass
            picture, created = Thumbnail.objects.get_or_create(pk=form.cleaned_data['id'])
            if not created: #there is already an image uploaded
                try:
                    if picture.image.name:#if there is file name entry, delete it
                       import os
                       from django.conf import settings
                       #we delete the previous image
                       os.remove(os.path.join(settings.MEDIA_ROOT,str(picture.image.name) ))
                 
                    fp=form.save(commit=False)
                    fp.Thumbnail.name=form.cleaned_data['slug']+'.jpg'
                    fp.save()      
                    messages.success(request, me+' Image Uploaded ')
                except OSError:
                    messages.error(request, me+' Upload Failed ')
            


return render_to_response(template_name,locals(),context_instance = RequestContext(request) )