excel - xlsxwriter not applying format to header row of dataframe - Python Pandas

Question

I am trying to take a dataframe and create a spreadsheet from that dataframe using the xlsxwriter

I am trying to do some formatting to the header row, but the only formatting that seems to be working on that row is for the row height. The exact same formatting options work on the other rows of the dataframe.

Please see code below..

The red color (and the height) is applied to all rows except the header row (row 2) - the red color is applied to both row 0 and row 3, but only the height is applied to row 2

Any help would be much appreciated

import numpy as np
import pandas as pd
from pandas.io.data import DataReader
from pandas import DataFrame
from IPython import display

import xlsxwriter

WorkBookName="test.xlsx"



df3=pd.read_csv("https://raw.githubusercontent.com/wesm/pydata-book/master/ch08/tips.csv", sep=',')

writer = pd.ExcelWriter(WorkBookName, engine='xlsxwriter')
df3.to_excel(writer, sheet_name="sheet",index=False,startrow=2)


workbook  = writer.book
worksheet = writer.sheets["sheet"]

worksheet.write(0,0,"text string")
worksheet.write(0,1,"text string")
worksheet.write(0,2,"text string")
worksheet.write(0,3,"text string")


color_format = workbook.add_format({'color': 'red'})
worksheet.set_row(0,50,color_format)
worksheet.set_row(2,50,color_format)
worksheet.set_row(3,50,color_format)    


writer.save()

display.FileLink(WorkBookName)

Answer 1

You are trying to change the formatting of the header so you should first reset the default header settings

pd.core.format.header_style = None

Then apply the formatting as required

format = workbook.add_format()
format.set_align('center')
format.set_align('vcenter')

worksheet.set_column('A:C',5, format)

here is complete working code

d=pd.DataFrame({'a':['a','a','b','b'],
               'b':['a','b','c','d'],
               'c':[1,2,3,4]})
d=d.groupby(['a','b']).sum()

pd.core.format.header_style = None

writer = pd.ExcelWriter('pandas_out.xlsx', engine='xlsxwriter')
workbook  = writer.book
d.to_excel(writer, sheet_name='Sheet1')

worksheet = writer.sheets['Sheet1']

format = workbook.add_format()
format.set_align('center')
format.set_align('vcenter')

worksheet.set_column('A:C',5, format)
writer.save()