# example1.py
def main(dsn):
    "Do something with the database"
    print("ok")

if __name__ == '__main__':
    import sys
    n = len(sys.argv[1:])
    if n == 0:
        sys.exit('usage: python %s dsn' % sys.argv[0])
    elif n == 1:
        main(sys.argv[1])
    else:
        sys.exit('Unrecognized arguments: %s' % ' '.join(sys.argv[2:]))