old_contents: """
  This linter reports missing primary / unique index
  """
  from collections import OrderedDict
  
  from indexdigest.utils import LinterEntry
  
  
  def check_missing_primary_index(database):
      """
      :type database  indexdigest.database.Database
      :rtype: list[LinterEntry]
      """
      for table in database.get_tables():
          # list non-primary (and non-unique) indices only
          # @see https://bugs.mysql.com/bug.php?id=76252
          # @see https://github.com/Wikia/app/pull/9863
          indices = list(filter(
              lambda index: index.is_primary or index.is_unique,
              database.get_table_indices(table)
          ))
  
          if indices:
              # so we have at least one primary or unique index defined
              continue
  
          context = OrderedDict()
          context['schema'] = database.get_table_schema(table)
  
          yield LinterEntry(linter_type='missing_primary_index', table_name=table,
                            message='"{}" table does not have any primary or unique index'.
                            format(table),
                            context=context)
  
new_contents: """
  This linter reports missing primary / unique index
  """
  from collections import OrderedDict
  
  from indexdigest.utils import LinterEntry
  
  
  def check_missing_primary_index(database):
      """
      :type database  indexdigest.database.Database
      :rtype: list[LinterEntry]
      """
      for table in database.get_tables():
          # list non-primary (and non-unique) indices only
          # @see https://bugs.mysql.com/bug.php?id=76252
          # @see https://github.com/Wikia/app/pull/9863
          indices = [
              index for index in database.get_table_indices(table)
              if index.is_primary or index.is_unique
          ]
  
          if indices:
              # so we have at least one primary or unique index defined
              continue
  
          context = OrderedDict()
          context['schema'] = database.get_table_schema(table)
  
          yield LinterEntry(linter_type='missing_primary_index', table_name=table,
                            message='"{}" table does not have any primary or unique index'.
                            format(table),
                            context=context)
  
subject: Use list comprehension as pylint suggests