<s> from sqlalchemy import Column , Integer , MetaData , Table , String <EOL> meta = MetaData ( ) <EOL> instances = Table ( '<STR_LIT>' , meta , <EOL> Column ( '<STR_LIT:id>' , Integer ( ) , primary_key = True , nullable = False ) , <EOL> ) <EOL> root_device_name = Column ( <EOL> '<STR_LIT>' , <EOL> String ( length = <NUM_LIT:255> , convert_unicode = False , assert_unicode = None , <EOL> unicode_error = None , _warn_on_bytestring = False ) , <EOL> nullable = True ) <EOL> def upgrade ( migrate_engine ) : <EOL> meta . bind = migrate_engine <EOL> instances . create_column ( root_device_name ) <EOL> def downgrade ( migrate_engine ) : <EOL> meta . bind = migrate_engine <EOL> instances . drop_column ( '<STR_LIT>' ) </s>
