paragraph font extraction using pydocx

[M S Pangtey]

Hi, I am facing problem in formatting Docx file using python docx library.

I am able to replace some text in a  paragraph but can't maintain text font.

from docx import Document

# read doc file

doc = Document(file name)

# now I need to replace few words in a paragraph,(lets say replace a key in the paragraph by val) and paragraph index(pid) is known  so I am performing following tasks:

paragraph = doc.paragraphs[int(pid)].text

para = re.sub(key, val, paragraph.rstrip())  

doc.paragraphs[pid].text = para

# After saving this document, now I can see replaced text in the file but not able to maintain the font. I mean earlier common font in the file was "Times New Roman" but after text replacement paragraph font and weight is different. So how can I maintain the paragraph font and other styling similar to before text replacement. 

Or how to extract the existing font!!!