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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _pre_process_line(line, comment_markers=_COMMENT_MARKERS):
 """ Preprocess a line in properties; strip comments, etc. :param line: A string not starting w/ any white spaces and ending w/ line breaks. It may be empty. see also: :func:`load`. :param comment_markers: Comment markers, e.g. '#' (hash) True True True 'calendar.japanese.type: LocalGregorianCalendar# comment' """

    if not line:
        return None

    if any(c in line for c in comment_markers):
        if line.startswith(comment_markers):
            return None

    return line