code: def check_backslashes(self, definition, docstring):
          r'''D301: Use rraw triple double quotes""" if you use any backslashes
          (\) in your docstrings.
  
          '''
          # Just check that docstring is raw, check_triple_double_quotes
          # ensures the correct quotes.
          if docstring and '\\' in docstring and not docstring.startswith(
                  ('r', 'ur')):
              return violations.D301()
docs: r'''D301: Use r""" if any backslashes in a docstring.
  
          Use r"""raw triple double quotes""" if you use any backslashes
          (\) in your docstrings.