[Python-Dev] Re: I plan to accept PEP 623 "Remove wstr from Unicode" next week

Thank you Victor for PEP-Delegating and accepting. Reducing 8bytes per str object (or 16bytes per non-ASCII str object) will be a significant win for all Python users. On Wed, Jul 15, 2020 at 8:20 AM Victor Stinner wrote:

Hi,

I have the pleasure of announcing that I accept the PEP 623 "Remove wstr from Unicode", congratulations INADA-san!

I see this PEP as a good way to better communicate on incoming backward incompatible C API changes. The PEP is a good document to explain the Motivation, the Rationale and also to list affected C functions. It can also be used and referenced in What's New in Python documents.

INADA-san: I let you update the PEP status. You may also announce the PEP approval on the capi-sig mailing list.

Victor

Le mer. 8 juil. 2020 à 10:56, Victor Stinner a écrit :

...

Hi,

As the PEP delegate of the PEP 623, I plan to accept PEP 623 "Remove wstr from Unicode" next week. As far as I know, all previous remarks have been taken in account.

https://www.python.org/dev/peps/pep-0623/

I worked with INADA-san to adjust his PEP 623 plan:

* DeprecationWarning warnings will be emitted as soon as Python 3.10 to help developers detect the deprecation at runtime, rather than only announcing the deprecation with compiler warnings and in the documentation.

* Developers have two Python releases (3.10 and 3.11) with these runtime warnings before functions are removed

* The PEP lists all APIs which will be removed in Python 3.12.

* The PEP gives links to past discussions and issues.

About the "size > 0" condition in "PyUnicode_FromUnicode(NULL, size) and PyUnicode_FromStringAndSize(NULL, size) emit DeprecationWarning when size > 0". INADA-san made sure that Cython avoids PyUnicode_FromUnicode(NULL, 0) to create an empty string: it's already fixed! The fix will be part of the next Cython 0.29.x release (it should be 0.29.21). But it will take time until popular extension modules using Cython will distribute a new release with updated generated C code.

INADA-san checked popular PyPI projects. The majority of projects impacted by the PEP are using Cython and so are easy to fix: just regenerate C code with the fixed Cython. He added: "A few projects, pyScss and Genshi are not straightforward. But it is not too hard and I will help them." We have time before Python 3.12 final to update these projects.

The PEP 623 is backward incompatible on purpose. If needed, it remains possible to use a single code base working on Python 2.7 and Python 3.12 using #ifdef. But Python 3.12 will not be released before 2023: three years after Python 2 end of life, so I think that it's reasonable for extension modules to consider dropping Python 2 support to implement the PEP 623 (stop using these deprecated C APIs).

Victor -- Night gathers, and now my watch begins. It shall not end until my death.

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