old_contents: from django.conf import settings
  
  from osmdata.exporters import CSVExporter
  
  from .models import ActionReport
  
  class AnalyzedCSVExporter(CSVExporter):
      """ Enhance CSVExporter adding some fields from diffanalysis module
      """
  
      def get_header_row(self):
          return super().get_header_row() + (
              'main_tag', 'is_geometric_action', 'is_tag_action',
              'added_tags', 'removed_tags', 'modified_tags')
  
      @staticmethod
      def str_list(l):
          """ Produce a list of str given a list of anything
          """
          return [str(i) for i in l]
  
      def get_row(self, action):
          ar = ActionReport.objects.get_or_create_for_action(action)
          return super().get_row(action) + (
              ar.main_tag,
              ar.is_geometric_action,
              ar.is_tag_action,
              self.str_list(ar.added_tags.all()),
              self.str_list(ar.removed_tags.all()),
              [self.str_list(i.all()) for i in [ar.modified_tags_old, ar.modified_tags_new]],
          )
  
new_contents: from django.conf import settings
  
  from osmdata.exporters import CSVExporter
  
  from .models import ActionReport
  
  class AnalyzedCSVExporter(CSVExporter):
      """ Enhance CSVExporter adding some fields from diffanalysis module
      """
  
      def get_header_row(self):
          return super().get_header_row() + (
              'main_tag', 'is_geometric_action', 'is_tag_action',
              'added_tags', 'removed_tags', 'modified_tags')
  
      @staticmethod
      def str_list(l):
          """ Produce a list of str given a list of anything
          """
          return [str(i) for i in l]
  
      def get_row(self, action):
          ar = ActionReport.objects.get_or_create_for_action(action)
          return super().get_row(action) + (
              ar.main_tag,
              ar.is_geometric_action,
              ar.is_tag_action,
              self.str_list(ar.added_tags.all()),
              self.str_list(ar.removed_tags.all()),
              [self.str_list(i.all())
               for i in [ar.modified_tags_old, ar.modified_tags_new]],
          )
  
subject: Fix style