[$] The PEPs of Python 3.9

With the releaseof Python 3.9.0b1, the first of four planned betas for the developmentcycle, Python 3.9 is now feature-complete. There is still plenty todo in terms of testing and stabilization before the October finalrelease. The release announcement lists a half-dozen Python EnhancementProposals (PEPs) that were accepted for 3.9. We have looked at someof those PEPs along the way; there are some updates on those. It seemslike a good time to fill in some of the gaps on what will be coming in Python 3.9