Help: can't invoke lilypond-book (python exception)

[Alon Sho'er]

I downloaded python to be able to run lilypond-book, but it doesn't seem to work. Upon invoking lilypond-book I get the following error:   File "C:\Program Files (x86)\LilyPond\usr\bin\lilypond-book.py", line 590     os.mkdir (global_options.output_dir, 0777)                                             ^ SyntaxError: leading zeros in decimal integer literals are not permitted; use an 0o prefix for octal integers Has anyone experienced this? I would like to use lilypond-book on html files. I have lilypond version 2.18.2 and python version 3.8.1