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gh-132983: Simplify `_zstd_exec()` by AA-Turner · Pull Request #133775 · python/cpython · GitHub

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gh-132983: Simplify _zstd_exec() - #133775

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AA-Turner merged 6 commits into
python:mainfrom
AA-Turner:zstd-exec
May 9, 2025
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gh-132983: Simplify _zstd_exec()#133775
AA-Turner merged 6 commits into
python:mainfrom
AA-Turner:zstd-exec

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AA-Turner commented May 9, 2025 •
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cc @Rogdham (can't request review).

Follows on from #133670. Again best reviewed commit-by-commit. We remove around 100 lines of C code overall.

The last commit (6a3a135 (#133775)) only serves to merge two functions and contains no behaviour change, but does increase the diff size.

  • Rename type specs to add underscores after 'zstd'
  • Replace the add_type_to_module() function with an ADD_TYPE macro, using PyModule_AddType instead of PyModule_AddObjectRef.
  • Remove the unused 'empty_readonly_memoryview', 'str_flush', 'str_read', 'str_readinto', and 'str_write' module state members
  • Set the CONTINUE/FLUSH_* constants in Python rather than C. To achieve this, export the three ZSTD_EndDirective enum members from the _zstd module.

AA-Turner requested a review from emmatyping May 9, 2025 16:29
bedevere-app Bot mentioned this pull request May 9, 2025
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picnixz reviewed May 9, 2025
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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

Overall, I think it's a nice improvement but usually, C classes are read-only (e.g., _sha2.SHA2Type does not allow setting class variables afterwards; the same holds for lzma.LZMACompressor so it would be better to do the same for the Zstd* types)

Comment thread Modules/_zstd/_zstdmodule.c
Comment thread Lib/compression/zstd/__init__.py Outdated
serhiy-storchaka reviewed May 9, 2025
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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

It would be better to make classes implemented in C immutable.

emmatyping approved these changes May 9, 2025
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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

Thanks! These are great refactors.

picnixz reviewed May 9, 2025
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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

You can add Py_TPFLAGS_IMMUTABLETYPE in this PR or in another.

Comment thread Modules/_zstd/compressor.c
Comment thread Modules/_zstd/_zstdmodule.c
AA-Turner merged commit bbe9c31 into python:main May 9, 2025
AA-Turner deleted the zstd-exec branch May 9, 2025 19:15
AA-Turner added the needs backport to 3.14 bugs and security fixes label May 9, 2025

miss-islington-app Bot commented May 9, 2025

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Thanks @AA-Turner for the PR 🌮🎉.. I'm working now to backport this PR to: 3.14.
🐍🍒⛏🤖 I'm not a witch! I'm not a witch!

miss-islington pushed a commit to miss-islington/cpython that referenced this pull request May 9, 2025
pythongh-132983: Simplify _zstd_exec() (pythonGH-133775)
d15236e 
(cherry picked from commit bbe9c31)

Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>

bedevere-app Bot commented May 9, 2025

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GH-133786 is a backport of this pull request to the 3.14 branch.

bedevere-app Bot removed the needs backport to 3.14 bugs and security fixes label May 9, 2025
AA-Turner added a commit that referenced this pull request May 9, 2025
[3.14] gh-132983: Simplify _zstd_exec() (GH-133775) (#133786)
5796e3b 
gh-132983: Simplify ``_zstd_exec()`` (GH-133775)
(cherry picked from commit bbe9c31)

Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>
Pranjal095 pushed a commit to Pranjal095/cpython that referenced this pull request Jul 12, 2025
pythongh-132983: Simplify _zstd_exec() (python#133775)
7f6dc2b
taegyunkim pushed a commit to taegyunkim/cpython that referenced this pull request Aug 4, 2025
pythongh-132983: Simplify _zstd_exec() (python#133775)
db9c2c5
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emmatyping emmatyping approved these changes
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