Returns a TIME column as a time object:

      >>> time_or_None('15:06:17')
      datetime.time(15, 6, 17)

    Illegal values are returned as None:

      >>> time_or_None('-25:06:17') is None
      True
      >>> time_or_None('random crap') is None
      True

    Note that MySQL always returns TIME columns as (+|-)HH:MM:SS, but
    can accept values as (+|-)DD HH:MM:SS. The latter format will not
    be parsed correctly by this function.

    Also note that MySQL's TIME column corresponds more closely to
    Python's timedelta and not time. However if you want TIME columns
    to be treated as time-of-day and not a time offset, then you can
    use set this function as the converter for FIELD_TYPE.TIME.

def convert_time(obj):
    """Returns a TIME column as a time object:

      >>> time_or_None('15:06:17')
      datetime.time(15, 6, 17)

    Illegal values are returned as None:

      >>> time_or_None('-25:06:17') is None
      True
      >>> time_or_None('random crap') is None
      True

    Note that MySQL always returns TIME columns as (+|-)HH:MM:SS, but
    can accept values as (+|-)DD HH:MM:SS. The latter format will not
    be parsed correctly by this function.

    Also note that MySQL's TIME column corresponds more closely to
    Python's timedelta and not time. However if you want TIME columns
    to be treated as time-of-day and not a time offset, then you can
    use set this function as the converter for FIELD_TYPE.TIME.
    """
    if not PY2 and isinstance(obj, (bytes, bytearray)):
        obj = obj.decode('ascii')

    m = TIME_RE.match(obj)
    if not m:
        return obj

    try:
        groups = list(m.groups())
        groups[-1] = _convert_second_fraction(groups[-1])
        hours, minutes, seconds, microseconds = groups
        return datetime.time(hour=int(hours), minute=int(minutes),
                             second=int(seconds), microsecond=int(microseconds))
    except ValueError:
        return obj