8000 What's New in Python 3.9: sort improved modules by vstinner · Pull Request #18383 · python/cpython · GitHub
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Feb 6, 2020
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What's New in Python 3.9: sort improved modules #18383

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72 changes: 36 additions & 36 deletions Doc/whatsnew/3.9.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -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
----

Expand Down Expand Up @@ -240,52 +248,31 @@ 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
-------

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
-------
Expand All @@ -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
------
Expand All @@ -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
=============
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0