          Driver.ensure_registered()
  
          # Preprocess json inputs. This converts json strings to dictionaries,
          # which are parsed below the same way as direct dictionary inputs.
          if isinstance(ds_input, six.string_types) and json_regex.match(ds_input):
              ds_input = json.loads(ds_input)
  
          # If input is a valid file path, try setting file as source.
          if isinstance(ds_input, six.string_types):
              if not os.path.exists(ds_input):
 
</s> remove         if isinstance(ds_input, six.string_types):
 </s> add         if isinstance(ds_input, str): </s> remove         if isinstance(ds_input, six.string_types):
 </s> add         if isinstance(ds_input, str): </s> remove         if isinstance(file, six.string_types) or file is None:
 </s> add         if isinstance(file, str) or file is None: </s> remove     if isinstance(file_h, six.string_types):
 </s> add     if isinstance(file_h, str): </s> remove                 raise ValueError('String or unicode input unrecognized as WKT EWKT, and HEXEWKB.')
 </s> add                 raise ValueError('String input unrecognized as WKT EWKT, and HEXEWKB.')
        if isinstance(ds_input, str) and json_regex.match(ds_input):
          Driver.ensure_registered()
  
          # Preprocess json inputs. This converts json strings to dictionaries,
          # which are parsed below the same way as direct dictionary inputs.
        if isinstance(ds_input, str) and json_regex.match(ds_input):
              ds_input = json.loads(ds_input)
  
          # If input is a valid file path, try setting file as source.
          if isinstance(ds_input, six.string_types):
              if not os.path.exists(ds_input):
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/contrib/gis/gdal/raster/source.py