def time_str_sec(delta):
    """Print a hh:mm::ss time"""
    fraction = delta % 1
    delta -= fraction
    delta = int(delta)
    seconds = delta % 60
    delta /= 60
    minutes = delta % 60
    delta /= 60
    hours = delta
    return '%02u:%02u:%02u' % (hours, minutes, seconds)