query from postgresql using python as dictionary

Tnx a lot Andrey Shokhin ,

full answer is:

#!/var/bin/python 
import psycopg2
import psycopg2.extras
conn = psycopg2.connect("dbname=uniart4_pr host=localhost user=user password=password")
cur = conn.cursor(cursor_factory=psycopg2.extras.DictCursor)
cur.execute ("select * from port")
ans =cur.fetchall()
ans1 = []
for row in ans:
    ans1.append(dict(row))

print ans1  #actually it's return