How to connect Amazon Redshift to python

Question

This is my python code and I want to connect my Amazon Redshift database to Python, but it is showing error in host.

Can anyone tell me the correct syntax? Am I passing all the parameters correctly?

con=psycopg2.connect("dbname = pg_table_def, host=redshifttest-icp.cooqucvshoum.us-west-2.redshift.amazonaws.com, port= 5439, user=me, password= secret")

This is the error:

OperationalError: could not translate host name "redshift://redshifttest-xyz.cooqucvshoum.us-west-2.redshift.amazonaws.com," to address: Unknown host

Answer 1

It appears that you wish to run Amazon Redshift queries from Python code.

The parameters you would want to use are:

• dbname: This is the name of the database you entered in the Database name field when the cluster was created.
• user: This is you entered in the Master user name field when the cluster was created.
• password: This is you entered in the Master user password field when the cluster was created.
• host: This is the Endpoint provided in the Redshift management console (without the port at the end): redshifttest-xyz.cooqucvshoum.us-west-2.redshift.amazonaws.com
• port: 5439

For example:

con=psycopg2.connect("dbname=sales host=redshifttest-xyz.cooqucvshoum.us-west-2.redshift.amazonaws.com port=5439 user=master password=secret")

Answer 2

Old question but I just arrived here from Google.

The accepted answer doesn't work with SQLAlchemy, although it's powered by psycopg2:

sqlalchemy.exc.ArgumentError: Could not parse rfc1738 URL from string 'dbname=... host=... port=... user=... password=...'

What worked:

create_engine(f"postgresql://{REDSHIFT_USER}:{REDSHIFT_PASSWORD}@{REDSHIFT_HOST}:{REDSHIFT_PORT}/{REDSHIFT_DATABASE}")

Which works with psycopg2 directly too:

psycopg2.connect(f"postgresql://{REDSHIFT_USER}:{REDSHIFT_PASSWORD}@{REDSHIFT_HOST}:{REDSHIFT_PORT}/{REDSHIFT_DATABASE}")

Using the postgresql dialect works because Amazon Redshift is based on PostgreSQL.

Hope it can help other people!