Where to write your python scripts in django?

Question

Django

Hello!

I created a project on django, created an application, created a page with a form, the form accepts a file, and then sends it to the server using the POST method for further processing.

def index(request):
  if request.method == 'POST':
    form = myForm(request.POST, request.FILES)
    if form.is_valid():
       ...
       ...

I have no idea where to process it, in views.py? Create a new file and import it into views.py? And how to pull out the result from there and show each user your own? What if more than one person uses the form at the same time?

In general, the head is boiling and nothing is clear