Python 3.7.8rc1 and 3.6.11rc1 are now available. 3.7.8rc1 is the release preview of the next bugfix release of Python 3.7; 3.6.11rc1 is the release preview of the next security-fix release of Python 3.6. Assuming no critical problems are found prior to 2020-06-27, no code changes are planned between these release candidates and the final releases. These release candidates are intended to give you the opportunity to test the new security and bug fixes in 3.7.8 and security fixes in 3.6.11. While we strive to not introduce any incompatibilities in new bugfix and security releases, we encourage you to test your projects and report issues found to bugs.python.org as soon as possible. Please keep in mind that these are preview releases and, thus, their use is not recommended for production environments.
You can find the release files, a link to their changelogs, and more information here:
Python core development news and information.