The following PRs are everything according to the release notes:

• Python3.8 additions and changes #3337
• Add importlib.metadata (Python >= 3.8) #3346
• Add Python 3.8 annotations #3347
• Clean up multiprocessing + shared_memory #3351
• extract asyncio exceptions into a separate module #3356
• Annotations for remaining Python 3.8 additions #3358
• Annotate Python 3.8 removals #3359
• Add missing Python 3.7 and 3.8 annotations #3399
• Add functools.cached_property #3439
• Add sys.addaudithook() and audit() #3455

@srittau There is functools.cached_property, if you know how to type this one...

@bluetech Thanks, #3439.

While adding sys.pycache_prefix (#3454), I noticed a couple more new functions in sys: addaudithook and audit. I don't use this, and the PEP is a bit too lengthy for me to dig into, but thought I'd mention it.

sys.audit et al: #3455