Basic connection to PostgreSQL with psycopg : PostgreSQL « Database « Python Tutorial

import psycopg

def getdsn(db = None, user = None, passwd = None, host = None):
    if user == None:
        import os, pwd
        user = pwd.getpwuid(os.getuid())[0]
    if db == None:
        db = user

    dsn = 'dbname=%s user=%s' % (db, user)
    if passwd != None:
        dsn += ' password=' + passwd
    if host != None:
        dsn += ' host=' + host
    return dsn

dsn = getdsn()
print "Connecting to %s" % dsn
dbh = psycopg.connect(dsn)
print "Connection successful."
dbh.close()

15.4.PostgreSQL
	15.4.1.	Query data
	15.4.2.	Basic connection to PostgreSQL with psycopg
	15.4.3.	Query PostgreSQL database with select statement
	15.4.4.	Create a table and insert data
	15.4.5.	executemany() for batch update
	15.4.6.	optimized execute() for multiple rows example
	15.4.7.	Fetch all rows after query
	15.4.8.	Adjust the connect() call below for your database
	15.4.9.	Fetch row one by one
	15.4.10.	Fetch row by using cursor
	15.4.11.	Parameter style
	15.4.12.	Get cursor
	15.4.13.	Using types to insert data
	15.4.14.	Commit example