insert(id, Height, X, Y)
....
def insert(gid,height, X, Y):
   gid=str(gid)
   connection = psycopg2.connect(host='', dbname='postgres',   user='', password='')
    cur = connection.cursor()
   cur.execute ("""INSERT INTO gronkarta.test5 (gid, height, geom) VALUES (""" + gid + """,""" + str(height) + ""","""+ST_GeomFromText('POINT(X Y)', 3008)+""");""")