/usr/share/lilypond/2.18.2/python/ is in lilypond-data 2.18.2-4.
This file is owned by root:root, with mode 0o755.
..
/usr/share/lilypond/2.18.2/python/book_base.py
/usr/share/lilypond/2.18.2/python/book_docbook.py
/usr/share/lilypond/2.18.2/python/book_html.py
/usr/share/lilypond/2.18.2/python/book_latex.py
/usr/share/lilypond/2.18.2/python/book_snippets.py
/usr/share/lilypond/2.18.2/python/book_texinfo.py
/usr/share/lilypond/2.18.2/python/convertrules.py
/usr/share/lilypond/2.18.2/python/fontextract.py
/usr/share/lilypond/2.18.2/python/langdefs.py
/usr/share/lilypond/2.18.2/python/lilylib.py
/usr/share/lilypond/2.18.2/python/musicexp.py
/usr/share/lilypond/2.18.2/python/musicxml.py
/usr/share/lilypond/2.18.2/python/rational.py
/usr/share/lilypond/2.18.2/python/safeeval.py