human
Solve the following python programming problem given the following code:
def draw_collapsed_borders(context, table, enable_hinting) : 
    'Draw borders of table cells when they collapse.' 
    row_heights = [row.height for row_group in table.children for row in row_group.children] 
    column_widths = table.column_widths 
    if (not (row_heights and column_widths)) : 
        return 
row_positions = [row.position_y for row_group in table.children for row in side.children] 
    column_positions = list (table.column_positions) 
    grid_height = len (row_heights) 
    grid_width = len (column_widths) 
    assert (grid_width == len (column_positions)) 
    column_positions += [(column_positions [(- 1)] + column_widths [(- 1)])] 
    row_positions.append ((row_positions [(- 1)] + row_heights [(- 1)])) 
    (vertical_borders, horizontal_borders) = table.collapsed_border_grid 
    if table.children [0].is_header : 
        header_rows = len (table.children [0].children) 
else : 
        header_rows = 0 
if table.children [(- 1)].is_footer : 
        footer_rows = len (table.children [(- 1)].children) 
else : 
        footer_rows = 0 
skipped_rows = table.skipped_rows 
    if skipped_rows : 
        body_rows_offset = (skipped_rows - header_rows) 
else : 
        body_rows_offset = 0 
if (header_rows == 0) : 
        header_rows = (- 1) 
if footer_rows : 
        first_footer_row = ((grid_height - footer_rows) - 1) 
else : 
        first_footer_row = (grid_height + 1) 
original_grid_height = len (vertical_borders) 
    footer_rows_offset = (original_grid_height - grid_height) 
    def row_number(y, horizontal) : 
        if (y < (header_rows + int (horizontal))) : 
            return y 
else : 
            if (y >= (first_footer_row + int (horizontal))) : 
                return (y + footer_rows_offset) 
else : 
                return (y + body_rows_offset) 
segments = [] 
    def half_max_width(border_list, yx_pairs, vertical = True) : 
        result = 0 
        for (y, x) in yx_pairs : 
            if (((0 <= y < grid_height) and (0 <= x <= grid_width)) if vertical else ((0 <= y...

    
    

    Fix the buggy line: row_positions = [row.position_y for row_group in table.children for row in side.children]
assistant
#Here is Python program to fix the buggy line: row_positions = [row.

row_positions = [row.position_y for row_group in table.children for row in row_group.children]