  
      describe_pattern() cannot be used here, because we cannot rely on the
      urlpattern having regex or name attributes.
      """
      if isinstance(pattern, six.string_types):
          hint = (
              "Try removing the string '{}'. The list of urlpatterns should not "
              "have a prefix string as the first element.".format(pattern)
          )
      elif isinstance(pattern, tuple):
 
</s> remove         if isinstance(index, six.integer_types):
 </s> add         if isinstance(index, int): </s> remove         if isinstance(dr_input, six.string_types):
 </s> add         if isinstance(dr_input, str): </s> remove         if not isinstance(pattern, six.string_types) or len(pattern) > 9:
 </s> add         if not isinstance(pattern, str) or len(pattern) > 9: </s> remove         if not isinstance(target, six.string_types) or not isinstance(index, int):
 </s> add         if not isinstance(target, str) or not isinstance(index, int): </s> remove         # Empty strings should be returned as Unicode
 </s> add         # Empty strings should be returned as string
    if isinstance(pattern, str):
  
      describe_pattern() cannot be used here, because we cannot rely on the
      urlpattern having regex or name attributes.
      """
    if isinstance(pattern, str):
          hint = (
              "Try removing the string '{}'. The list of urlpatterns should not "
              "have a prefix string as the first element.".format(pattern)
          )
      elif isinstance(pattern, tuple):
keep keep keep keep replace keep keep keep keep keep
 Refs #23919 -- Removed six.<various>_types usage

Thanks Tim Graham and Simon Charette for the reviews. 
django/core/checks/urls.py