<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def encode(input, encoding=UTF8, errors='strict'):
 """ Encode a single string. :param input: An Unicode string. :param encoding: An :class:`Encoding` object or a label string. :param errors: Type of error handling. See :func:`codecs.register`. :raises: :exc:`~exceptions.LookupError` for an unknown encoding label. :return: A byte string. """

    return _get_encoding(encoding).codec_info.encode(input, errors)[0]