map values from dict to django model where values are not necessarily coming from serialization

snippet.py

def bind(self, values, **options):
    exclude = options.get('exclude', [])
    rename_fields = options.get('rename_fields', {})
        
    for (field_name, field_value) in values.iteritems():
        if field_name not in exclude:
            if field_name in rename_fields.keys():
                field_name = rename_fields[field_name]
            field = self._meta.get_field(field_name)
            if field.choices:
                for choice_key, choice_value in field.choices:
                    if isinstance(choice_value, (list, tuple)):
                        for choicegrp_key, choicegrp_value in choice_value
                            if choicegrp_value == field_value:
                                field_value = choicegrp_key
                    else:
                        if choice_value == field_value:
                            field_value = choice_key

            setattr(self, field.attname, field.to_python(field_value))
    return self