@classmethod<EOL><INDENT>def _convert_to_stop(cls, stop_seq):<DEDENT>
return map(cls._convert_to_color, stop_seq)<EOL>
Convert ``stop_seq`` to a list of openpyxl v2 Color objects,
suitable for initializing the ``GradientFill`` ``stop`` parameter.
Parameters
----------
stop_seq : iterable
    An iterable that yields objects suitable for consumption by
    ``_convert_to_color``.
Returns
-------
stop : list of openpyxl.styles.Color