human
Here's a good function header given the following:
I wrote the below code

    cur_buffer = vim.current.buffer
    cur_bufnr = cur_buffer.number
    def add_multiplier(buffer, dct):
        dct[u'priority_multiplier'] = (1 + (0.001 * abs((buffer.number - cur_bufnr))))
        return dct
    return ((lambda buffer, current, modified: (buffer_updated_segment_info(segment_info, buffer), add_multiplier(buffer, {u'highlight_group_prefix': u'{0}{1}'.format(current, modified), u'divider_highlight_group': u'tab:divider'})))(buffer, (u'buf' if (buffer is cur_buffer) else u'buf_nc'), (u'_mod' if (int(vim.eval(u"getbufvar({0},    '&modified')".format(buffer.number))) > 0) else u'')) for buffer in vim.buffers if ((buffer is cur_buffer) or show_unlisted or (int(vim.eval((u'buflisted(%s)' % buffer.number))) > 0)))

What's a good function header?
assistant
#Here's a good function header.

@requires_segment_info
def bufferlister(pl, segment_info, show_unlisted=False, **kwargs):