index_name as optional positional argument

Signed-off-by: Itay Dafna <i.b.dafna@gmail.com>

ipydatagrid/datagrid.py

@@ -359,16 +359,12 @@ class DataGrid(DOMWidget):
  {"area": "all", "padding": 30, "numCols": None}, allow_none=False
  ).tag(sync=True)
 
- def __init__(self, dataframe, **kwargs):
+ def __init__(self, dataframe, index_name=None, **kwargs):
  # Setting default index name if not explicitly
  # set by the user.
- if "index_name" in kwargs:
- self._index_name = kwargs["index_name"]
- else:
- self._index_name = None
-
+ self._index_name = index_name
  self.data = dataframe
- super().__init__()
+ super().__init__(**kwargs)
  self._cell_click_handlers = CallbackDispatcher()
  self._cell_change_handlers = CallbackDispatcher()
  self.on_msg(self.__handle_custom_msg)