How can I access an attribute?

Question

Django

When registering, the user needs to upload his avatar. In views.py, when receiving form values, a watermark is applied to the avatar, after which all data is stored in the database. Tell me how to extract the avatar so that it can be processed later, and how to put it back processed.
When using dic(form) I do not find any attributes similar to those used in the user model.

def post(self, request):
        form = ClientCreateForm(request.POST, request.FILES)
        print(dir(form))
        if not form.is_valid():
            return HttpResponse('Client does not created!')
        c = form.save(commit=False)
        c.avatar = watermark_avatar(input_avatar_path = request.FILES['avatar'])
        с.save()
        return HttpResponse('New client is registred')

Answer 1

from PIL import Image 

def save(self, *args, **kwargs):
    super(Posts, self).save(*args, **kwargs) # Posts - модель
    imag = Image.open(self.image.path) #image - поле в модели.
    if imag.width > 400 or imag.height> 300: # изменение размера для примера
        output_size = (400, 300)
        imag.thumbnail(output_size)
        imag.save(self.post_image.path)