- Update to 3.9.0rc1:
* Core and Builtins
- bpo-38156: Handle interrupts that come after EOF
correctly in PyOS_StdioReadline.
* Library
- bpo-41497: Fix potential UnicodeDecodeError in dis
module.
- bpo-41490: Update ensurepip to install pip 20.2.1 and
setuptools 49.2.1.
- bpo-41467: On Windows, fix asyncio recv_into() return
value when the socket/pipe is closed (BrokenPipeError):
return 0 rather than an empty byte string (b'').
- bpo-41425: Make tkinter doc example runnable.
- bpo-41384: Raise TclError instead of TypeError when an
unknown option is passed to tkinter.OptionMenu.
- bpo-38731: Fix NameError in command-line interface of
py_compile.
- bpo-41317: Use add_done_callback() in
asyncio.loop.sock_accept() to unsubscribe reader early on
cancellation.
- bpo-41364: Reduce import overhead of uuid.
- bpo-41341: Recursive evaluation of typing.ForwardRef in
get_type_hints.
- bpo-41182: selector: use DefaultSelector based upon
implementation
- bpo-40726: Handle cases where the end_lineno is None on
ast.increment_lineno().
* Documentation
- bpo-41045: Add documentation for debug feature of
f-strings.
- bpo-41314: Changed the release when from __future__
import annotations becomes the default from 4.0 to 3.10
(following a change in PEP 563).
* Windows
- bpo-41492: Fixes the description that appears in UAC
prompts.
- bpo-40948: Improve post-install message to direct people
to the “py” command.
- bpo-41412: The installer will now fail to install on
Windows 7 and Windows 8. Further, the UCRT dependency is
now always downloaded on demand.
- bpo-40741: Update Windows release to include SQLite
3.32.3.
* IDLE
- bpo-41468: Improve IDLE run crash error message (which
users should never see).
- bpo-41373: Save files loaded with no line ending, as when
blank, or different line endings, by setting its line
ending to the system default. Fix regression in 3.8.4 and
3.9.0b4.
- Synchronize formatting and fixes with python38.