def alter_column(self, keyspace, column_family, column, value_type):

        self._conn.set_keyspace(keyspace)
        cfdef = self.get_keyspace_column_families(keyspace)[column_family]
        self._system_update_column_family(self._alter_column_cfdef(cfdef, column, value_type))
Sets a data type for the value of a specific column.
dataset/ETHPy150Open pycassa/pycassa/pycassa/system_manager.py/SystemManager.alter_column