old_contents: import json
  
  from django.core.serializers import serialize
  from django.core.serializers.json import DjangoJSONEncoder
  from django.db.models.query import QuerySet
  from django.utils.encoding import force_text
  from django.utils.encoding import smart_str
  from django.utils.formats import number_format
  from django.utils.functional import Promise, curry
  from django.utils.html import strip_tags
  from django.utils.six.moves.html_parser import HTMLParser
  from django.utils.translation import ugettext_lazy as _
  
  
  def field_as_string(obj, field, ascii=False):
      value = getattr(obj, field + '_csv_display', None)
      if value is None:
          value = getattr(obj, field + '_display', None)
          if value is None:
              value = getattr(obj, field)
          if isinstance(value, bool):
              value = (_('no'), _('yes'))[value]
          if isinstance(value, float) or isinstance(value, int):
              value = number_format(value)
      #FixMe : The , is the thing which break the tests ','
      #if hasattr(value, '__iter__'):
      #    print(smart_plain_text(value[0], ascii))
      #    return ''.join([smart_plain_text(item, ascii) for item in value])
      return smart_plain_text(value, ascii)
  
  
  def plain_text(html):
      h = HTMLParser()
      return h.unescape(strip_tags(html))
  
  
  def smart_plain_text(s, ascii=False):
      if s is None:
          return ''
      try:
          # Converts to unicode, remove HTML tags, convert HTML entities
          us = plain_text(u"{}".format(s))
          if ascii:
              return smart_str(us)
          return us
      except UnicodeDecodeError:
          return smart_str(s)
  
  
  class DjangoJSONEncoder(DjangoJSONEncoder):
      """
      Taken (slightly modified) from:
      http://stackoverflow.com/questions/2249792/json-serializing-django-models-with-simplejson
      """
      def default(self, obj):
          # https://docs.djangoproject.com/en/dev/topics/serialization/#id2
          if isinstance(obj, Promise):
              return force_text(obj)
          if isinstance(obj, QuerySet):
              # `default` must return a python serializable
              # structure, the easiest way is to load the JSON
              # string produced by `serialize` and return it
  
              return json.loads(serialize('json', obj))
          return force_text(obj)
  
  
  # partial function, we can now use dumps(my_dict) instead
  # of dumps(my_dict, cls=DjangoJSONEncoder)
  json_django_dumps = curry(json.dumps, cls=DjangoJSONEncoder)
  
new_contents: import json
  
  from django.core.serializers import serialize
  from django.core.serializers.json import DjangoJSONEncoder
  from django.db.models.query import QuerySet
  from django.utils.encoding import force_text
  from django.utils.encoding import smart_str
  from django.utils.formats import number_format
  from django.utils.functional import Promise, curry
  from django.utils.html import strip_tags
  from django.utils.six.moves.html_parser import HTMLParser
  from django.utils.translation import ugettext_lazy as _
  
  
  def field_as_string(obj, field, ascii=False):
      value = getattr(obj, field + '_csv_display', None)
      if value is None:
          value = getattr(obj, field + '_display', None)
          if value is None:
              value = getattr(obj, field)
          if isinstance(value, bool):
              value = (_('no'), _('yes'))[value]
          if isinstance(value, float) or isinstance(value, int):
              value = number_format(value)
      # FixMe : The , is the thing which break the tests ','
      # if hasattr(value, '__iter__'):
      #    print(smart_plain_text(value[0], ascii))
      #    return ''.join([smart_plain_text(item, ascii) for item in value])
      return smart_plain_text(value, ascii)
  
  
  def plain_text(html):
      h = HTMLParser()
      return h.unescape(strip_tags(html))
  
  
  def smart_plain_text(s, ascii=False):
      if s is None:
          return ''
      try:
          # Converts to unicode, remove HTML tags, convert HTML entities
          us = plain_text(u"{}".format(s))
          if ascii:
              return smart_str(us)
          return us
      except UnicodeDecodeError:
          return smart_str(s)
  
  
  class DjangoJSONEncoder(DjangoJSONEncoder):
      """
      Taken (slightly modified) from:
      http://stackoverflow.com/questions/2249792/json-serializing-django-models-with-simplejson
      """
      def default(self, obj):
          # https://docs.djangoproject.com/en/dev/topics/serialization/#id2
          if isinstance(obj, Promise):
              return force_text(obj)
          if isinstance(obj, QuerySet):
              # `default` must return a python serializable
              # structure, the easiest way is to load the JSON
              # string produced by `serialize` and return it
  
              return json.loads(serialize('json', obj))
          return force_text(obj)
  
  
  # partial function, we can now use dumps(my_dict) instead
  # of dumps(my_dict, cls=DjangoJSONEncoder)
  json_django_dumps = curry(json.dumps, cls=DjangoJSONEncoder)
  
subject: Fix pep8