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The quickly python package is able to create and manipulate LilyPond music
documents. LilyPond documents often use the .ly extension, hence the name.
It is currently in an early development stage, but slated to become the successor of the python-ly package. Like python-ly, it provides tools to manipulate LilyPond music documents, but instead of using the lexer in python-ly, which is very difficult to maintain, it uses the new parce package for parsing LilyPond files.
ly.dom and ly.music are superseded by quickly.dom which provides a
way to both build a LilyPond source file from scratch (like ly.dom) and
manipulate an existing document (like ly.music). Most of the functionality
that in python-ly is implemented at the token level, like transposing and
rhythm manipulations, now works on the musical representation provided by
quickly.dom, which looks a lot like ly.music.
This module is written and maintained by Wilbert Berendsen, and will, as it
grows, also contain (adapted) code from python-ly that was contributed by
others. Python 3.6 and higher is supported. Besides Python itself the most
recent version of the parce module is needed. Testing is done by running
pytest-3 in the root directory.
The documentation reflects which parts are already working :-) Enjoy!