old_contents: from django.contrib.admin import FieldListFilter
  from django.db import models
  from django.utils.translation import ugettext_lazy as _
  
  
  class NumericFieldListFilter(FieldListFilter):
      def __init__(self, field, request, params, model, model_admin, field_path):
          self.template = 'admin/numericfieldlistfilter.html'
          self.lookup_kwarg = '%s__lte' % field_path
          self.lookup_kwarg2 = '%s__gte' % field_path
          self.lookup_val = request.GET.get(self.lookup_kwarg)
          self.lookup_val2 = request.GET.get(self.lookup_kwarg2)
          super(NumericFieldListFilter, self).__init__(field,
              request, params, model, model_admin, field_path)
  
      def expected_parameters(self):
          return [self.lookup_kwarg, self.lookup_kwarg2]
  
      def choices(self, cl):
          for lookup, title in (
                  (None, _('All')),
                  ('1', _('OMER')),
                  ('0', _('No'))):
              yield {
                  'selected': self.lookup_val == lookup and not self.lookup_val2,
                  'query_string': cl.get_query_string({
                      self.lookup_kwarg: lookup,
                  }, [self.lookup_kwarg2]),
                  'display': title,
              }
          if isinstance(self.field, models.NullBooleanField):
              yield {
                  'selected': self.lookup_val2 == 'True',
                  'query_string': cl.get_query_string({
                      self.lookup_kwarg2: 'True',
                  }, [self.lookup_kwarg]),
                  'display': _('Unknown'),
              }
new_contents: from django.contrib.admin import FieldListFilter
  
  
  class NumericFieldListFilter(FieldListFilter):
      def __init__(self, field, request, params, model, model_admin, field_path):
          self.template = 'admin/numericfieldlistfilter.html'
          self.lookup_kwarg = '%s__lte' % field_path
          self.lookup_kwarg2 = '%s__gte' % field_path
          self.lookup_val = request.GET.get(self.lookup_kwarg)
          self.lookup_val2 = request.GET.get(self.lookup_kwarg2)
          super(NumericFieldListFilter, self).__init__(field,
              request, params, model, model_admin, field_path)
  
      def expected_parameters(self):
          return [self.lookup_kwarg, self.lookup_kwarg2]
subject: remove unused filter code