Python 3.10.0a5 is now available
Pablo Galindo Salgado
pablogsal at gmail.com
Wed Feb 3 05:56:06 EST 2021
Well, this one took a bit more time due to some surprise last time
reference leaks and release blockers to fix, but now Python 3.10.0a5 it’s
here. Will this be the first release announcement of the 3.10 series
without copy-paste typos? Go get it here:
https://www.python.org/downloads/release/python-3100a5/
*Major new features of the 3.10 series, compared to 3.9*
Python 3.10 is still in development. This release, 3.10.0a5 is the fifth of
seven planned alpha releases. Alpha releases are intended to make it easier
to test the current state of new features and bug fixes and to test the
release process. During the alpha phase, features may be added up until the
start of the beta phase (2021-05-03) and, if necessary, may be modified or
deleted up until the release candidate phase (2021-10-04). Please keep in
mind that this is a preview release and its use is not recommended for
production environments.
Many new features for Python 3.10 are still being planned and written.
Among the new major new features and changes so far:
- PEP 623 <https://www.python.org/dev/peps/pep-0623/> – Remove wstr from
Unicode
- PEP 604 <https://www.python.org/dev/peps/pep-0604/> – Allow writing
union types as X | Y
- PEP 612 <https://www.python.org/dev/peps/pep-0612/> – Parameter
Specification Variables
- PEP 626 <https://www.python.org/dev/peps/pep-0626/> – Precise line
numbers for debugging and other tools.
- bpo-38605 <https://bugs.python.org/issue38605>: from __future__ import
annotations (PEP 563 <https://www.python.org/dev/peps/pep-0563/>) is now
the default.
- PEP 618 <https://www.python.org/dev/peps/pep-0618/>– Add Optional
Length-Checking To zip.
- bpo-12782 <https://bugs.python.org/issue12782>: Parenthesized context
managers are now officially allowed.
- (Hey, fellow core developer, if a feature you find important is
missing from this list, let Pablo know <pablogsal at python.org>.)
The next pre-release of Python 3.10 will be 3.10.0a6, currently scheduled
for 2021-03-01.
And now for something completely different
The Chandrasekhar limit is the maximum mass of a stable white dwarf star.
White dwarfs resist gravitational collapse primarily through electron
degeneracy pressure, compared to main sequence stars, which resist collapse
through thermal pressure. The Chandrasekhar limit is the mass above which
electron degeneracy pressure in the star’s core is insufficient to balance
the star’s own gravitational self-attraction. Consequently, a white dwarf
with a mass greater than the limit is subject to further gravitational
collapse, evolving into a different type of stellar remnant, such as a
neutron star or black hole. Those with masses up to the limit remain stable
as white dwarfs. The currently accepted value of the Chandrasekhar limit is
about 1.4 M☉ (2.765×1030 kg). So we can be safe knowing that our sun is not
going to become a black hole!
Regards from cloudy London,
Pablo Galindo Salgado
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