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What's New in Python 3.9: sort improved modules (GH-18383)

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Victor Stinner 2020-02-06 23:03:01 +01:00 committed by GitHub
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Doc/whatsnew/3.9.rst
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@ -205,6 +205,14 @@ with this change. The overridden methods of :class:`~imaplib.IMAP4_SSL` and
:class:`~imaplib.IMAP4_stream` were applied to this change.
(Contributed by Dong-hee Na in :issue:`38615`.)
importlib
---------
To improve consistency with import statements, :func:`importlib.util.resolve_name`
now raises :exc:`ImportError` instead of :exc:`ValueError` for invalid relative
import attempts.
(Contributed by Ngalim Siregar in :issue:`37444`.)
math
----
@ -240,32 +248,6 @@ The :func:`os.putenv` and :func:`os.unsetenv` functions are now always
available.
(Contributed by Victor Stinner in :issue:`39395`.)
poplib
------
:class:`~poplib.POP3` and :class:`~poplib.POP3_SSL` now raise a :class:`ValueError`
if the given timeout for their constructor is zero to prevent the creation of
a non-blocking socket. (Contributed by Dong-hee Na in :issue:`39259`.)
threading
---------
In a subinterpreter, spawning a daemon thread now raises a :exc:`RuntimeError`. Daemon
threads were never supported in subinterpreters. Previously, the subinterpreter
finalization crashed with a Python fatal error if a daemon thread was still
running.
(Contributed by Victor Stinner in :issue:`37266`.)
venv
----
The activation scripts provided by :mod:`venv` now all specify their prompt
customization consistently by always using the value specified by
``__VENV_PROMPT__``. Previously some scripts unconditionally used
``__VENV_PROMPT__``, others only if it happened to be set (which was the default
case), and one used ``__VENV_NAME__`` instead.
(Contributed by Brett Cannon in :issue:`37663`.)
pathlib
-------
@ -273,19 +255,24 @@ Added :meth:`pathlib.Path.readlink()` which acts similarly to
:func:`os.readlink`.
(Contributed by Girts Folkmanis in :issue:`30618`)
poplib
------
:class:`~poplib.POP3` and :class:`~poplib.POP3_SSL` now raise a :class:`ValueError`
if the given timeout for their constructor is zero to prevent the creation of
a non-blocking socket. (Contributed by Dong-hee Na in :issue:`39259`.)
pprint
------
:mod:`pprint` can now pretty-print :class:`types.SimpleNamespace`.
(Contributed by Carl Bordum Hansen in :issue:`37376`.)
importlib
---------
signal
------
To improve consistency with import statements, :func:`importlib.util.resolve_name`
now raises :exc:`ImportError` instead of :exc:`ValueError` for invalid relative
import attempts.
(Contributed by Ngalim Siregar in :issue:`37444`.)
Exposed the Linux-specific :func:`signal.pidfd_send_signal` for sending to
signals to a process using a file descriptor instead of a pid. (:issue:`38712`)
smtplib
-------
@ -297,11 +284,14 @@ a non-blocking socket. (Contributed by Dong-hee Na in :issue:`39259`.)
:class:`~smtplib.LMTP` constructor now has an optional *timeout* parameter.
(Contributed by Dong-hee Na in :issue:`39329`.)
signal
------
threading
---------
Exposed the Linux-specific :func:`signal.pidfd_send_signal` for sending to
signals to a process using a file descriptor instead of a pid. (:issue:`38712`)
In a subinterpreter, spawning a daemon thread now raises a :exc:`RuntimeError`. Daemon
threads were never supported in subinterpreters. Previously, the subinterpreter
finalization crashed with a Python fatal error if a daemon thread was still
running.
(Contributed by Victor Stinner in :issue:`37266`.)
typing
------
@ -311,6 +301,16 @@ types with context-specific metadata and new ``include_extras`` parameter to
:func:`typing.get_type_hints` to access the metadata at runtime. (Contributed
by Till Varoquaux and Konstantin Kashin.)
venv
----
The activation scripts provided by :mod:`venv` now all specify their prompt
customization consistently by always using the value specified by
``__VENV_PROMPT__``. Previously some scripts unconditionally used
``__VENV_PROMPT__``, others only if it happened to be set (which was the default
case), and one used ``__VENV_NAME__`` instead.
(Contributed by Brett Cannon in :issue:`37663`.)
Optimizations
=============