How to fill a PDF in Python?

Question

Python

There is such a task: every month the script needs to send me a report as a pdf file. Here I am trying to fill in the finished pdf template. It is necessary that a copy of this template document be created, but already filled out.
I tried in the template pdf document to write "macros" in the places where you need to insert text, such as {date} (insert the date in this place in the document), {income} (insert income for the month), and so on. I wrote the following script with the PyPDF2 library, which only reads the template:

from PyPDF2 import PdfFileReader

pdf_document = "/root/source/statistics_template.pdf" #шаблон отчета
with open(pdf_document, "rb") as filehandle:  
    pdf = PdfFileReader(filehandle)
    pdf_writer = PdfFileWriter()
   
    info = pdf.getDocumentInfo()
    pages = pdf.getNumPages()
    
    for i in range(pages):
        page = pdf.getPage(i)
        
        page_new_text = page.extractText().replace('{date}', '01.01.2021').replace('{income}', '13 000 000') #чтение текста шаблона, замена макросов на значения

But what's next? How to write the page_new_text variable to the text of a new pdf file?
Or am I not doing it right at all? I just came up with this idea, maybe it could be better. Please help please.