...     '[fourth-section]': {'fourth_extra': '4', 'fourth': '"four"'},

    ... }

    >>> print(expand(template, mako_variable_values, settings))

    ERROR: http_server is 'nc' - it should be one of 'waitress', 'gearbox', 'gevent', 'gunicorn', 'uwsgi'

    <BLANKLINE>

    [first-section]

    <BLANKLINE>

    variable=VALUE

    #variable2  =    value after tab

    variable2 = VAL2

    <BLANKLINE>

    first_extra = EXTRA

    <BLANKLINE>

    <BLANKLINE>

    # FUNCTION RESULT

    [second-section]

    # option a was chosen

    <BLANKLINE>

    [comment-section]

    variable3 = 3.0

    #variable4 = 4.0

    variable4 = 4.1

    #variable5 = 5.0

    #variable5 = 5.1

                else:

                    line += '\n%s = %s' % (key, new_value)

                section_settings.pop(key)

                return line

            lines = re.sub(r'^#([^#\n\s]*)[ \t]*=[ \t]*(.*)$', add_after_comment, lines, flags=re.MULTILINE)

            # 3rd pass:

            # settings that haven't been consumed yet at is appended to section

            if section_settings:

                lines += '\n' + ''.join('%s = %s\n' % (key, value) for key, value in sorted(section_settings.items()))

    # process sections until comments before next section or end

    ini_lines = re.sub(r'''^

        (\[.*\])\n

        # after the section name, a number of chunks with:

        (

            (?:

                # a number of comments or empty lines

                (?:[#].*\n|\n)*

                # one or more non-empty non-comments non-section-start lines

                (?:[^\n#[].*\n)+

                # a number of comments - not empty lines