old_contents: from __future__ import unicode_literals
  
  from rest_framework import serializers
  from django.utils.encoding import force_text
  
  from django_countries import countries
  from django_countries.base import CountriesBase
  
  
  class CountryField(serializers.ChoiceField):
  
      def __init__(self, *args, **kwargs):
          self.country_dict = kwargs.pop('country_dict', None)
          field_countries = kwargs.pop('countries', None)
          self.countries = field_countries if field_countries else countries
          super(CountryField, self).__init__(self.countries, *args, **kwargs)
  
      def to_representation(self, obj):
          code = self.countries.alpha2(obj)
          if not code:
              return ''
          if not self.country_dict:
              return code
          return {'code': code, 'name': force_text(self.countries.name(obj))}
  
      def to_internal_value(self, data):
          if isinstance(data, dict):
              data = data.get('code')
          country = self.countries.alpha2(data)
          if data and not country:
              country = self.countries.by_name(force_text(data))
              if not country:
                  self.fail('invalid_choice', input=data)
          return country
  
new_contents: from __future__ import unicode_literals
  
  from rest_framework import serializers
  from django.utils.encoding import force_text
  
  from django_countries import countries
  
  
  class CountryField(serializers.ChoiceField):
  
      def __init__(self, *args, **kwargs):
          self.country_dict = kwargs.pop('country_dict', None)
          field_countries = kwargs.pop('countries', None)
          self.countries = field_countries if field_countries else countries
          super(CountryField, self).__init__(self.countries, *args, **kwargs)
  
      def to_representation(self, obj):
          code = self.countries.alpha2(obj)
          if not code:
              return ''
          if not self.country_dict:
              return code
          return {'code': code, 'name': force_text(self.countries.name(obj))}
  
      def to_internal_value(self, data):
          if isinstance(data, dict):
              data = data.get('code')
          country = self.countries.alpha2(data)
          if data and not country:
              country = self.countries.by_name(force_text(data))
              if not country:
                  self.fail('invalid_choice', input=data)
          return country
  
subject: Remove unused import