Python 3.7.0 and 3.6.6

The latest feature release of Python, 3.7.0, hasbeen announced, along with the latest maintenance release forPython 3.6, 3.6.6.As noted on the "What's New InPython 3.7" page, there are many significant changes in therelease. These include postponedevaluation of type annotations (for performance and simpler forwardreferences to types), insertion-order preservation for dict objects is nowpart of the language, data classes havebeen added, async and await are now keywords,there are usability and performance improvements for asyncio, a newC API for thread-local storage has been added, and more. 3.7 will getbug fix updates until shortly after 3.8 is released (in roughly 18 months) and then willget security updates until mid-2023.3.6 will continue to get bug fixes through the end of 2018 and securityfixes into 2021.