docs: def pad_pdf_pages(pdf_name, pages_per_q) -> None:
      """
      Checks if PDF has the correct number of pages. If it has too many, warns
      the user. If it has too few, adds blank pages until the right length is
      reached.
      """
      pdf = PyPDF2.PdfFileReader(pdf_name)
      output = PyPDF2.PdfFileWriter()
      num_pages = pdf.getNumPages()
      if num_pages > pages_per_q:
          logging.warning('{} has {} pages. Only the first '
                          '{} pages will get output.'
                          .format(pdf_name, num_pages, pages_per_q))
  
      # Copy over up to pages_per_q pages
      for page in range(min(num_pages, pages_per_q)):
          output.addPage(pdf.getPage(page))
  
      # Pad if necessary
      if num_pages < pages_per_q:
          for page in range(pages_per_q - num_pages):
              output.addBlankPage()
  
      # Output the PDF
      with open(pdf_name, 'wb') as out_file:
          output.write(out_file)