python XlsxWriter set border around multiple cells

Question

I need an easy way to set border around multiple cells, like so:

All I found was border of

Answer 1

The current solution by @aubaub draws an empty box. I needed to draw a frame around existing values without overriding them. This is my function in case it helps anyone:

def draw_frame_border(workbook, worksheet, first_row, first_col, rows_count, cols_count):

    # top left corner
    worksheet.conditional_format(first_row, first_col,
                                 first_row, first_col,
                                 {'type': 'formula', 'criteria': 'True',
                                  'format': workbook.add_format({'top': 1, 'left': 1})})
    # top right corner
    worksheet.conditional_format(first_row, first_col + cols_count - 1,
                                 first_row, first_col + cols_count - 1,
                                 {'type': 'formula', 'criteria': 'True',
                                  'format': workbook.add_format({'top': 1, 'right': 1})})
    # bottom left corner
    worksheet.conditional_format(first_row + rows_count - 1, first_col,
                                 first_row + rows_count - 1, first_col,
                                 {'type': 'formula', 'criteria': 'True',
                                  'format': workbook.add_format({'bottom': 1, 'left': 1})})
    # bottom right corner
    worksheet.conditional_format(first_row + rows_count - 1, first_col + cols_count - 1,
                                 first_row + rows_count - 1, first_col + cols_count - 1,
                                 {'type': 'formula', 'criteria': 'True',
                                  'format': workbook.add_format({'bottom': 1, 'right': 1})})

    # top
    worksheet.conditional_format(first_row, first_col + 1,
                                 first_row, first_col + cols_count - 2,
                                 {'type': 'formula', 'criteria': 'True', 'format': workbook.add_format({'top': 1})})
    # left
    worksheet.conditional_format(first_row + 1,              first_col,
                                 first_row + rows_count - 2, first_col,
                                 {'type': 'formula', 'criteria': 'True', 'format': workbook.add_format({'left': 1})})
    # bottom
    worksheet.conditional_format(first_row + rows_count - 1, first_col + 1,
                                 first_row + rows_count - 1, first_col + cols_count - 2,
                                 {'type': 'formula', 'criteria': 'True', 'format': workbook.add_format({'bottom': 1})})
    # right
    worksheet.conditional_format(first_row + 1,              first_col + cols_count - 1,
                                 first_row + rows_count - 2, first_col + cols_count - 1,
                                 {'type': 'formula', 'criteria': 'True', 'format': workbook.add_format({'right': 1})})