In Amazon Redshift\'s Getting Started Guide, it\'s mentioned that you can utilize SQL client tools that are compatible with PostgreSQL to connect to your Amazon Redshift Clu
I don't think SQL Alchemy "natively" knows about Redshift. You need to change the JDBC "URL" string to use postgres.
postgres
jdbc:postgres://shippy.cx6x1vnxlk55.us-west-2.redshift.amazonaws.com:5439/shippy
Alternatively, you may want to try using sqlalchemy-redshift using the instructions they provide.