anchor.diff:  legacy_assignment(Pid, DataFrame, Value, Keywords) ->
       % from keywords get the column to assign
       Column = begin
  -        ColumnAtom = proplists:get_value(column, Keywords, <<>>),
  +        ColumnAtom = proplists:get_value(column, Keywords, ''),
           ColumnList = atom_to_list(ColumnAtom),
           list_to_binary(ColumnList)
       end,
  
positive.code: -export([legacy_query/4,
      legacy_assignment/4]).
  
  -export([drop/4]).
  
  %% DataFrames in erlang term
  to_erl(Pid, {'$erlport.opaque', python, _} = OpaqueDataFrame) ->
  
negative.code: %% Reindexing, Selection & Label manipulation
  
  drop(Pid, DataFrame, Column, Keywords) ->
      gen_server:call(Pid, {'core.jun.dataframe', [DataFrame, drop, [Column], 'None', Keywords]}, infinity).
  
  rename(Pid, DataFrame, _Column, Keywords) ->
      gen_server:call(Pid, {'core.jun.dataframe', [DataFrame, rename, [], 'None', Keywords]}, infinity).
  