Modify value of a Django form field during clean()

Question

I am adding custom validation to my forms and custom fields in my Django app. I would like to be able to modify the value of a field when triggering an error. For example, i

Answer 1

This is the way I've tried and works for me:

 inst = my_form.save(commit=False)
 if not inst.a34_stuff: # or incorrect
     inst.data["a34_stuff"] = "corrected"