import psycopg2

conn = psycopg2.connect(
    "dbname=gpx user=postgres password=postgres host=localhost")

cur = conn.cursor()
cur.execute(
    "CREATE TABLE gpx (object_name VARCHAR(50) NOT NULL PRIMARY KEY, object_value xml);")

with open("bla.gpx", 'r') as gpxfile:
    data = gpxfile.read()
    cur.execute('INSERT INTO gpx (object_name, object_value) VALUES (%(filename)s, %(xmlstring)s)',
                {'filename': filename, 'xmlstring': data})

conn.commit()