Here is the detailed information regarding the release date of Python 3.9. Python 3.9 was released on October 5, 2020.
However, understanding the full release timeline is important, as the "final" release was preceded by several beta and release candidate versions. The Python development team follows a strict, calendar-based release schedule. For Python 3.9, the process spanned nearly a year and a half. python 3.9 release date