python-compiler is a project to port Python2's stdlib "compiler" package (https://docs.python.org/2.7/library/compiler.html) to Python3. Initial porting work and support of CPython3.5 constructs/bytecode was done me. Around the Christmas time last year, there was a patch from some Facebook people which upgraded it to CPython3.7 constructs/wordcode and added some missing parts (e.g. peephole optimizer). I also asked them if they'd like to handle further maintenance of the projects, and yesterday they finished organizational part on their side, making https://github.com/facebookincubator/python-compiler online.
The older repository, https://github.com/pfalcon/python-compiler was re-forked from the above repo.
python-compiler is an excellent tool to investigate and implement various optimizations and semantic extensions for (C)Python, and together with a suitable parser - to prototype and implement language extensions and dialects. As an example, it was used to demonstrate viability of the implementation of the (optional!) block-level scoping for Python: https://email@example.com/msg25349.html (that particular implementation doesn't include syntactic component and just switches "for" loops to use block-level variables as a proof of concept, a real implementation of course would use a keyword to introduce a block-scoped variable).