>>> cur.execute(@H_301_4@"INSERT INTO foo VALUES (%s)",@H_301_4@"bar")    # WRONG
>>> cur.execute(@H_301_4@"INSERT INTO foo VALUES (%s)",(@H_301_4@"bar"))  # WRONG
>>> cur.execute(@H_301_4@"INSERT INTO foo VALUES (%s)",(@H_301_4@"bar",)) # correct
>>> cur.execute(@H_301_4@"INSERT INTO foo VALUES (%s)",[@H_301_4@"bar"])  # correct