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MattR
MattR

Reputation: 5126

Applying Format to Entire Row Openpyxl

I have an Excel File that I want to format. The first row (excluding Headers so row2) should be red and italicized.

the Openpyxl Documentation states:

If you want to apply styles to entire rows and columns then you must apply the style to each cell yourself

I personally thinks this stinks... Here is my workaround:

import openpyxl
from openpyxl.styles import NamedStyle
from openpyxl import load_workbook
from openpyxl.styles.colors import RED
from openpyxl.styles import Font
# I normally import a lot of stuff... I'll also take suggestions here.

file = 'MY_PATH'
wb = load_workbook(filename=file)
sheet = wb.get_sheet_by_name('Output')

for row in sheet.iter_rows():
    for cell in row:
        if '2' in cell.coordinate:
            # using str() on cell.coordinate to use it in sheet['Cell_here']
            sheet[str(cell.coordinate)].font = Font(color='00FF0000', italic=True)

 wb.save(filename=file)

The first downside is that if there are more cells such as A24 my loop will apply the formatting to it. I can fix this with a regular expression. Would that be the correct approach?

Ultimately- is there a better way to apply a format to the entire row? Also. Can anyone point me in the right direction to some good Openpyxl documentation? I only found out about sheet.iter_rows() and cell.coordinates on Stack.

Upvotes: 24

Views: 58540

Answers (1)

Martin Evans
Martin Evans

Reputation: 46759

There is no need to iterate on all of the rows if you only intend to change the colour for the second row, you can just iterate over a single row as follows:

import openpyxl
from openpyxl import load_workbook
from openpyxl.styles import Font

file = 'input.xlsx'
wb = load_workbook(filename=file)
ws = wb['Output']
red_font = Font(color='00FF0000', italic=True)

# Enumerate the cells in the second row
for cell in ws["2:2"]:
    cell.font = red_font

wb.save(filename=file)

Giving you something like:

excel screen shot

Accessing multiple cells is described in the openpyxl docs: Accessing many cells

The format "2:2" enumerates the cells over a single row. If "2:3" is used, this will return the cells a row at a time, i.e. row 2 then row 3 and so would need an additional loop.

Alternatively, to use a NamedStyle:

import openpyxl
from openpyxl import load_workbook
from openpyxl.styles import Font, NamedStyle

file = 'input.xlsx'
wb = load_workbook(filename=file)
ws = wb['Output']

# Create a NamedStyle (if not already defined)
if 'red_italic' not in wb.named_styles:
    red_italic = NamedStyle(name="red_italic")
    red_italic.font = Font(color='00FF0000', italic=True)
    wb.add_named_style(red_italic)

# Enumerate the cells in the second row
for cell in ws["2:2"]:
    cell.style = 'red_italic'

wb.save(filename=file)

Upvotes: 55

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