I have lots of PDF books and wanted to create a simple index that I can search. So this script generates a Markdown file containing filename, title, metadata and outline if it is available.

GrabBooks.py

from pathlib import Path
from mdutils.mdutils import MdUtils
from mdutils import Html
from PyPDF2 import PdfReader

mdFile = MdUtils(file_name='books', title='My PDF Books')

def outline_list(outline):
    result = []
    for heading in outline:
        # print(type(heading))
        if type(heading) is not list:
            result.append(heading.title)
        else:
            result.append(outline_list(heading))
    return result

for path in Path('.').rglob('*.pdf'):
    filename = str(path.parent) + "/" + path.name
    reader = PdfReader(filename)
    mdFile.new_header(level=1, title=path.name)
    if not reader.is_encrypted:
        meta = reader.metadata
        # print(path.name)
        if meta is not None:
            mdFile.new_header(level=2, title='Meta Data')
            mdFile.new_paragraph('''Filename: {filename}
Title: {title}
Author(s): {authors}
Creator: {creator}
Subject: {subject}
Page Count: {pages}
            '''.format(filename=filename, 
                    title=meta.title, 
                    authors=meta.author, 
                    creator=meta.creator, 
                    subject=meta.subject, 
                    pages=len(reader.pages)))
        else:
                    mdFile.new_paragraph('''Filename: {filename}
**No metadata**'''.format(filename=filename))
        try:
            mdFile.new_header(level=2, title='Outline')
            outline = outline_list(reader.outline)
            mdFile.new_list(outline)
        except:
            mdFile.new_paragraph('Invalid outline')
    else:
        mdFile.new_paragraph('''Filename: {filename}
**Encrypted**'''.format(filename=filename))


mdFile.new_table_of_contents(table_title='Contents', depth=1)
mdFile.create_md_file()
print('Done')