python 4 release date
At the time of writing this post,
there is no release date for Python 4 yet.
The next version is going to be 3.9. 0
which is scheduled to be released on October 5, 2020,
it is planned to have support approximately until October 2025,
so the next release after 3.9 should come out
somewhere between 2020 and 2025.