So, dear Python super-users, Python 3.9.0b3 is OUT!
There was a problem with beta 2 (because of a bug liked to urlib.request.urlopen), so it never came out.
New features in 3.9 series.
1. Union operatori in dict
2. Type hinting generic in standard collections
3. flecible function and variable annotations
4. string methods to remove prefixes and suffixes
5. New PEG parser for CPython
6. Garbage collection does not block on resurrected objects
7. Unicode support updated to versione 13.0.0
8. When Python is initialized multiple times in the same process, it does not leak memory anymore https://bugs.python.org/issue1635741
9. Many builtins are sped up
10. Some modules use multiphase inizialization
11. Some modules use stable ABI
