old_contents: # Title: Expand an SFrame column of type list/dict into multiple columns
  
  import graphlab as gl
  
  # An SFrame with a column 'wc' of type (dict) 
  sf = gl.SFrame({'id': [1,2,3],
                 'dict_col': [{'a': 1}, {'b': 2}, {'a': 1, 'b': 2}]})
  
  sf_unpack = sf.unpack('dict_col', column_name_prefix="foo")
  # Returns
  #  +----+-------+-------+
  #  | id | foo.a | foo.b |
  #  +----+-------+-------+
  #  | 1  |  1    | None  |
  #  | 2  | None  |  2    |
  #  | 3  |  1    |  2    |
  #  +----+-------+-------+
  
new_contents: import graphlab as gl
  
  # An SFrame with a column 'wc' of type (dict) 
  sf = gl.SFrame({'id': [1,2,3],
                 'dict_col': [{'a': 1}, {'b': 2}, {'a': 1, 'b': 2}]})
  
  sf_unpack = sf.unpack('dict_col', column_name_prefix="foo")
  # Returns
  #  +----+-------+-------+
  #  | id | foo.a | foo.b |
  #  +----+-------+-------+
  #  | 1  |  1    | None  |
  #  | 2  | None  |  2    |
  #  | 3  |  1    |  2    |
  #  +----+-------+-------+
  
subject: Update sframe_unpack.py