How to modify existing text within Header and Footer word document using Python docx

Hi wonder if it possible to modify existing text within header and footer within word doc in python, using python docx.

Example on what I'm looking for.

I want to be able to write some code that can find text within the header or footer It will be 'December 2020' for example and to be able to edit it to 'January 2021'

What has been done so far

from docx import Document

doc=Document('./word.docx')
Dictionary = {"2020": "2021", "December":"January"
for i in Dictionary:
    for p in doc.paragraphs:
        if p.text.find(i)>=0:
           p.text=p.text.replace(i,Dictionary[i])
            
doc.save('./word_doc2.docx')

Solution

It is already present in the documentation of the python-docx library, you can find it Here. Otherwise, here is a simple script that does what you want (adapt it for your need):

from docx import Document
from docx.shared import Pt

# read  doc
doc = Document('./word.docx')

# define your style font and size for the header 
style_h = doc.styles['Header']
font_h = style_h.font
font_h.name = 'Arial'
font_h.bold = True
font_h.size = Pt(20)

# define your style font and size for the footer
style_f = doc.styles['Footer']
font_f = style_f.font
font_f.name = 'Aharoni'
font_f.bold = False
font_f.size = Pt(10)

# for the header:
header = doc.sections[0].header
paragraph_h = header.paragraphs[0]
paragraph_h.text = 'January 2021' # insert new value here.
paragraph_h.style = doc.styles['Header'] # this is what changes the style

# for the footer:
footer = doc.sections[0].footer
paragraph_f = footer.paragraphs[0]
paragraph_f.text = 'January 2021' # insert new value here.
paragraph_f.style = doc.styles['Footer']# this is what changes the style

doc.save('./word_doc2.docx')

N.B: This work on only one page docs, you can easily add a loop if you want to apply the same thing to all the pages (or use pre-set functions from the docx library.