Make one PDF file of Python documentation

If you already have PDFs, there is no need to re-create them. Instead, use something like PDF Split & Merge or PDFArchitect.

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Since the above mentioned solutions work only partially, I googled a bit and found sejda. You can download latest version here.

sejda-console merge -f PDFfile_1.pdf PDFfile_2.pdf -o PDFoutput.pdf

I tried it and it works as expected.

Try sejda-console -h merge for other options (i.e. specify dir with PDFs instead single files, etc.)