how can I replace/add word in docx

[robinshion]

my simple code is :

import datetime
import docx
from docx.oxml import OxmlElement
from docx.oxml.ns import qn
from docx import Document
from docx.shared import Inches
from docx.enum.text import WD_ALIGN_PARAGRAPH
from docx.shared import Pt
from docx.shared import Cm
from docx import section
import os
import sys


lastday=str(datetime.date.today()-datetime.timedelta(days=1))


doc=Document('C:\Users\Administrator\Desktop\python test\update_test\\sample.docx')


for paragraph in doc.paragraphs:
	if 'Report_name' in paragraph.text:
		print paragraph.text
		titlename='Test'+' '+lastday
		paragraph.text = titlename





filename=lastday+' '+'test.docx'
filepath = os.path.join(r'C:\Users\Administrator\Desktop\python test\update_test', filename)

doc.save(filepath)

the old text is Report_name, it is in bold but when I finished changing it change to non-bold how can I keep the style

[scanny]

Closing as duplicate of #30. Search the issues here with the term "replace" and you'll find more information on the complexities of doing this.