Setting styles in Openpyxl

Question

I need advice on setting styles in Openpyxl.

I see that the NumberFormat of a cell can be set, but I also require setting of font colors and attributes (bold etc). There is a style.py class but it seems I can't set the style attribute of a cell, and I don't really want to start tinkering with the openpyxl source code.

Has anyone found a solution to this?

Answer 1

As of openpyxl version 1.5.7, I have successfully applied the following worksheet style options...

from openpyxl.reader.excel import load_workbook from openpyxl.workbook import Workbook from openpyxl.styles import Color, Fill from openpyxl.cell import Cell  # Load the workbook... book = load_workbook('foo.xlsx')  # define ws here, in this case I pick the first worksheet in the workbook... #    NOTE: openpyxl has other ways to select a specific worksheet (i.e. by name #    via book.get_sheet_by_name('someWorksheetName')) ws = book.worksheets[0]  ## ws is a openpypxl worksheet object _cell = ws.cell('C1')  # Font properties _cell.style.font.color.index = Color.GREEN _cell.style.font.name = 'Arial' _cell.style.font.size = 8 _cell.style.font.bold = True _cell.style.alignment.wrap_text = True  # Cell background color _cell.style.fill.fill_type = Fill.FILL_SOLID _cell.style.fill.start_color.index = Color.DARKRED  # You should only modify column dimensions after you have written a cell in  #     the column. Perfect world: write column dimensions once per column #  ws.column_dimensions["C"].width = 60.0 

FYI, you can find the names of the colors in openpyxl/style.py... I sometimes I patch in extra colors from the X11 color names

class Color(HashableObject):     """Named colors for use in styles."""     BLACK = 'FF000000'     WHITE = 'FFFFFFFF'     RED = 'FFFF0000'     DARKRED = 'FF800000'     BLUE = 'FF0000FF'     DARKBLUE = 'FF000080'     GREEN = 'FF00FF00'     DARKGREEN = 'FF008000'     YELLOW = 'FFFFFF00'     DARKYELLOW = 'FF808000' 

Answer 2

As of openpyxl 2.0, styles are immutable.

If you have a cell, you can (e.g.) set bold text by:

cell.style = cell.style.copy(font=cell.style.font.copy(bold=True))

Yes, this is annoying.