import psycopg2

o = psycopg2.connect("dbname=test")
c = o.cursor()

def sql():
    c.execute("SELECT 1.23 AS foo")
    print(1, c.fetchone())
    #print c.description
    c.execute("SELECT 1.23::float AS foo")
    print(2, c.fetchone())
    #print c.description

print("BEFORE")
sql()
import gtk
print("AFTER")
sql()