class Book(models.Model):
    num_pages = ...
    author = ...
    date = ...

d = {"num_pages":40, author:"Jack", date:"3324"}

Book.objects.create(**d)

Book.objects.filter(pk=pk).update(**d)

Book.objects.create(**d)

instance, created = Book.objects.get_or_create(slug=slug, defaults=d)
if not created:
    for attr, value in d.iteritems():
        setattr(instance, attr, value)
    instance.save()

Book.objects.filter(id=id).update()

for attr, value in validated_data.items():
    setattr(instance, attr, value)
instance.save()

def is_simple_editable_field(field):
    return field.editable and not field.primary_key and not isinstance(field, (ForeignObjectRel, RelatedField))

def update_from_dict(instance, attrs, commit):
    _allowed_field_names = {
        f.name for f in instance._meta.get_fields()
        if is_simple_editable_field(f)
    }

    for attr, val in attrs.items():
        if attr in _allowed_field_names:
            setattr(instance, attr, val)

    if commit:
        instance.save()