Python 3.8 3.8.5 allalaadimine

Security
- bpo-41304: Fixes python3x._pth being ignored on Windows, caused by the fix for bpo-29778 (CVE-2020-15801).
- bpo-39603: Prevent http header injection by rejecting control characters in http.client.putrequest(…).
Core and Builtins
- bpo-41295: Resolve a regression in CPython 3.8.4 where defining “__setattr__” in a multi-inheritance setup and calling up the hierarchy chain could fail if builtins/extension types were involved in the base types.
Library
- bpo-41288: Unpickling invalid NEWOBJ_EX opcode with the C implementation raises now UnpicklingError instead of crashing.
- bpo-39017: Avoid infinite loop when reading specially crafted TAR files using the tarfile module (CVE-2019-20907).
Documentation
- bpo-37703: Updated Documentation to comprehensively elaborate on the behaviour of gather.cancel()
Build
- bpo-41302: Enable building Python 3.8 with libmpdec-2.5.0 to ease maintenance for Linux distributions. Patch by Felix Yan.
macOS
- bpo-40741: Update macOS installer to use SQLite 3.32.3.
IDLE
- bpo-41300: Save files with non-ascii chars. Fix regression released in 3.9.0b4 and 3.8.4.