I´m working on a script that will output a filled-out pdf using the pypdf extension. However I´m stuck on how to give the property of how many pages said document will have… any ideas?

writer.update_page_form_field_values(writer.pages, Field)
 
with open ("M:/#temp/filled-out.pdf", "wb") as out_stream:
    writer.write(out_stream)

The document output is showing up in target folder but it´s unopenable, having 0 pages