def get_max_col_num(mention):
span = _to_span(mention, idx=-<NUM_LIT:1>)<EOL>if span.sentence.is_tabular():<EOL><INDENT>return span.sentence.cell.col_end<EOL><DEDENT>else:<EOL><INDENT>return None<EOL><DEDENT>
Return the largest column number that a Mention occupies.

    :param mention: The Mention to evaluate. If a candidate is given, default
        to its last Mention.
    :rtype: integer or None