Django model method - create_or_update
There is update_or_create, eg::
obj, created = Person.objects.update_or_create( first_name='John', last_name='Lennon', defaults={'first_name': 'Bob'},)# If person exists with first_name='John' & last_name='Lennon' then update first_name='Bob'# Else create new person with first_name='Bob' & last_name='Lennon'