psycopg2 OperationalError: FATAL: unsupported frontend protocol 1234.5679: server supports 2.0 to 3.0 code example

Example: psycopg2 OperationalError: FATAL: unsupported frontend protocol 1234.5679: server supports 2.0 to 3.0

>>> import psycopg2
>>> c = psycopg2.connect("host='localhost' dbname='mydb' user='myuser' password='secret' sslmode='disable' gssencmode='disable'")