PythonからPostgreSQLに接続ができません。

ould not connect to server: Connection refused
	Is the server running on host "127.0.0.1" and accepting
	TCP/IP connections on port 5432?
  
    connection = psycopg2.connect(
                 ^^^^^^^^^^^^^^^^^
psycopg2.OperationalError: could not connect to server: Connection refused
	Is the server running on host "127.0.0.1" and accepting
	TCP/IP connections on port 5432?

import psycopg2

path = '127.0.0.1'
port = '5432'
dbname = ''
user = ''
password = ''

conText = 'host={} port={} dbname={} user={} password={}'
conText = conText.format(path,port,dbname, user, password)

connection = psycopg2.connect(conText)
cur = connection.cursor()