<s> """<STR_LIT>""" <EOL> from sqlalchemy import MetaData <EOL> from sqlalchemy . orm import scoped_session , sessionmaker <EOL> __all__ = [ '<STR_LIT>' , '<STR_LIT>' , '<STR_LIT>' , '<STR_LIT>' ] <EOL> engine = None <EOL> Session = scoped_session ( sessionmaker ( <EOL> autoflush = True , <EOL> transactional = True , <EOL> ) ) <EOL> mapper = Session . mapper <EOL> metadata = MetaData ( ) </s>
