'Change an attribute (in the ``KEYWORD_ATTRIBUTES`` list) of a `Column`.
Parameters
col_name : str or int
The column name or index to change
attrib : str
The attribute name
new_value : object
The new value for the attribute'

def change_attrib(self, col_name, attrib, new_value):

    setattr(self[col_name], attrib, new_value)
