def row_name(dt):
    """Convert a datetime into the Hbase timestamp format."""
    # TODO: mobile.
    return (FX, dt.strftime('%Y-%m-%dT%H:%M:00.000')) % 'firefox::%s:%s'
dataset/ETHPy150Open jbalogh/glow/glow.py/row_name/swapped operands of `%`