def _assemble_simple(self, sql_str, *args, **kwargs):
query_string = sql.SQL(sql_str).format(<EOL>*[sql.Literal(a) for a in args]<EOL>)<EOL>return query_string<EOL>
Format a select statement with specific columns 

:sql_str:   An SQL string template
:*args:     Arguments to use as query parameters.
:returns:   Psycopg2 compiled query