Para crear el PDF a partir de las imágenes descargadas con https://gist.github.com/map0logo/d97911f3d7dae2d30804

libro_pdf.py

# instalar img2pdf usando
# $ pip install img2pdf
import img2pdf
import glob

page_list = glob.glob("*.jpg")

def page_num(s):
    start = s.index("-") + 1
    end = s.index(".", start + 1)
    return s[start:end]

page_list.sort(key=page_num)
pdf_bytes = img2pdf.convert(page_list)

file = open("libro.pdf","wb")
file.write(pdf_bytes)
file.close()