title: Make one PDF file of Python documentation
body: <p>The Python official site offers PDF documentation downloads, but they are separated by chapters. I downloaded the source code and built the PDF documentation, which were separate PDFs also. </p>
  
  <p>How can I <strong>build one PDF file from the Makefile in the source code</strong>? I think that would be more convenient to read.</p>
  
  <p>If concatenating the separate PDFs won't leaves out the table of contents (bookmarks), it would be acceptable too. I tried <code>convert</code> from Imagemagick, <code>pdftk</code> and <code>pdfunite</code> from <code>poppler-utils</code>, they all lose the bookmarks after concatenation.</p>