Pandas to Excel – make part of the text bold

Question

Is there a way to make part of the string/cell bold in Pandas? I’m working with plenty of textual data, exporting to Excel and then using it in Word as linked content, so I can’t format it after it gets exported since the data changes pretty often.

Simplified example:

import pandas as pd

df = pd.DataFrame([["Hello world."], ["Hello bold world."]], columns = ["example"])

writer = pd.ExcelWriter('sample.xlsx', engine='xlsxwriter')
df.to_excel(writer, sheet_name='Sample', index=False)
writer.save()

I want to make "bold" in bold. Is there a way or another way how to highlight just part of the string?

I’ve tested using **bold**, <b>bold</b>, '33[1mbold33[0m' but no success at all.

Thanks a lot

Asked By: Karolína Vyskočilová

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Source

Answer 1

Thanks to @NoobVB I was pointed in the right direction: write_rich_string. Found this great article describing it as a cookbook and turned it into a working solution:

import pandas as pd
from pandas.io.excel._xlsxwriter import XlsxWriter


class RichExcelWriter(XlsxWriter):
    def __init__(self, *args, **kwargs):
        super(RichExcelWriter, self).__init__(*args, **kwargs)

    def _value_with_fmt(self, val):
        if type(val) == list:
            return val, None
        return super(RichExcelWriter, self)._value_with_fmt(val)

    def _write_cells(self, cells, sheet_name=None, startrow=0, startcol=0, freeze_panes=None):
        sheet_name = self._get_sheet_name(sheet_name)
        if sheet_name in self.sheets:
            wks = self.sheets[sheet_name]
        else:
            wks = self.book.add_worksheet(sheet_name)
            #add handler to the worksheet when it's created
            wks.add_write_handler(list, lambda worksheet, row, col, list, style: worksheet._write_rich_string(row, col, *list))
            self.sheets[sheet_name] = wks
        super(RichExcelWriter, self)._write_cells(cells, sheet_name, startrow, startcol, freeze_panes)

writer = RichExcelWriter('sample.xlsx')
workbook = writer.book
bold = workbook.add_format({'bold': True})

df = pd.DataFrame([["Hello world."], [["Hello", bold, "bold", "world."]]], columns = ["example"])

df.to_excel(writer, sheet_name='Sample', index=False)
writer.save()

This is the easiest way I figured out so far.

Answered By: Karolína Vyskočilová

Pandas to Excel – make part of the text bold

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