def append_column(self, data_array, ckey='<STR_LIT>'):
if not type(ckey) is str:<EOL><INDENT>print("<STR_LIT>")<EOL>return<EOL><DEDENT>if ckey in self.ckeys:<EOL><INDENT>print("<STR_LIT>"+ckey+"<STR_LIT>")<EOL>return<EOL><DEDENT>return self.insert_column(data_array, ckey)<EOL>
This will append a new column and fill it with the data from the
the supplied array.

Parameters
----------
data_array  
    Data; can be a list, but will be converted to numpy array
ckey        
    Name of the column.