Connection from python to postgresql

Question

I'm trying to do a connection to PostgreSQL 9.6 from Python 3.6 with Pycharm 2018.1.4 on Windows 10 with the connector psycopg2 in the version 2.7.5. I have the following code:

import os, psycopg2, psycopg2.extras
conexion = psycopg2.connect("dbname=Seguritec_BD user=SU host=localhost password=root port=5432")
psycopg2.OperationalError
cursor = conexion.cursor()
cursor.execute("Select * from Ejecutivos")
filas = cursor.fetchall()

It throws the next error:

Traceback (most recent call last):
  File "D:/Documentos/Proyectos Pycharm/Graficos Drones/Login.py", line 3, in <module>
    conexion = psycopg2.connect("dbname=Seguritec_BD user=SU host=localhost password=root port=5432")
  File "D:\Documentos\Proyectos Python 3.5\lib\site-packages\psycopg2\__init__.py", line 130, in connect
    conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
psycopg2.OperationalError

It's an empty OperationalError, there's no description of the error.

Can you help me to understand and fix this error, please?

Answer 1

Test on Windows 10, PostgreSQL 14, Python 3.10.0, psycopg2 2.9.3

psycopg2.OperationalError same for wrong ( user , password , database , privileges )

try to connect with to see verbose message

Answer 2

You have an issue so simplify it by first only using Postgresql to confirm your connection, first try psql only, substituting your values into the connection string

psql -U postgres -d postgres -c "SELECT *  FROM pg_user;"    

If you need reference

psql --help