copy cell style openpyxl

Question

I am trying to copy a sheet, default_sheet, into a new sheet new_sheet in the same workbook.

I did managed to create a new sheet and to cop

Answer 1

As of openpyxl 2.5.4, python 3.4: (subtle changes over the older version below)

new_sheet = workbook.create_sheet(sheetName)
default_sheet = workbook['default']

from copy import copy

for row in default_sheet.rows:
    for cell in row:
        new_cell = new_sheet.cell(row=cell.row, column=cell.col_idx,
                value= cell.value)
        if cell.has_style:
            new_cell.font = copy(cell.font)
            new_cell.border = copy(cell.border)
            new_cell.fill = copy(cell.fill)
            new_cell.number_format = copy(cell.number_format)
            new_cell.protection = copy(cell.protection)
            new_cell.alignment = copy(cell.alignment)

For openpyxl 2.1

new_sheet = workbook.create_sheet(sheetName)
default_sheet = workbook['default']

for row in default_sheet.rows:
    for cell in row:
        new_cell = new_sheet.cell(row=cell.row_idx,
                   col=cell.col_idx, value= cell.value)
        if cell.has_style:
            new_cell.font = cell.font
            new_cell.border = cell.border
            new_cell.fill = cell.fill
            new_cell.number_format = cell.number_format
            new_cell.protection = cell.protection
            new_cell.alignment = cell.alignment

Answer 2

May be this is the convenient way for most.

    from openpyxl import load_workbook
    from openpyxl import Workbook
    read_from = load_workbook('path/to/file.xlsx')
    read_sheet = read_from.active
    write_to = Workbook()
    write_sheet = write_to.active
    write_sheet['A1'] = read_sheet['A1'].value
    write_sheet['A1'].style = read_sheet['A1'].style
    write_to.save('save/to/file.xlsx')

Answer 3

The StyleableObject implementation stores styles in a single list, _style, and style properties on a cell are actually getters and setters to this array. You can implement the copy for each style individually but this will be slow, especially if you're doing it in a busy inner loop like I was.

If you're willing to dig into private class attributes there is a much faster way to clone styles:

if cell.has_style:
    new_cell._style = copy(cell._style)

FWIW this is how the optimized WorksheetCopy class does it in the _copy_cells method.