gh-115988: Add missing ARM64 and RISCV filter in lzma module - #115989

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gpshead merged 28 commits into
python:mainfrom
ivq:xz_bcj_filters
May 28, 2026
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gh-115988: Add missing ARM64 and RISCV filter in lzma module#115989
gpshead merged 28 commits into
python:mainfrom
ivq:xz_bcj_filters

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@ivqivq commented Feb 27, 2024

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#115988

Example:

importlzmafilter= [
{ "id": lzma.FILTER_RISCV },
{ "id": lzma.FILTER_LZMA2 },
]
in_fn="in.bin"out_fn="out.bin"withopen(in_fn, mode="rb") asf:
in_data=f.read()
withlzma.open(out_fn, mode="wb", filters=filter) asf:
f.write(in_data)

📚 Documentation preview 📚: https://cpython-previews--115989.org.readthedocs.build/

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Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool.

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Does test_lzma test the existing constants in any way? Such as for validity of the spelling? If so, the new ones should be added.

Someone more familiar with lzma should do a commit review.

Comment threadDoc/library/lzma.rst Outdated
Comment threadModules/_lzmamodule.c
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A Python core developer has requested some changes be made to your pull request before we can consider merging it. If you could please address their requests along with any other requests in other reviews from core developers that would be appreciated.

Once you have made the requested changes, please leave a comment on this pull request containing the phrase I have made the requested changes; please review again. I will then notify any core developers who have left a review that you're ready for them to take another look at this pull request.

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Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool.

If this change has little impact on Python users, wait for a maintainer to apply the skip news label instead.

@ivq

ivq commented Feb 28, 2024

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I have made the requested changes; please review again.

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I cannot do a commit review of this as it is out of my expertise. I requested reviews from two coredevs who have edited the file most recently.

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They are pretty new features (https://xz.tukaani.org/format/xz-file-format-1.2.0.txt):

 1.2.0 2024-01-19 Added RISC-V filter and updated URLs in
Sections 0.2 and 7. The URL of this
specification was changed.
1.1.0 2022-12-11 Added ARM64 filter and clarified 32-bit
ARM endianness in Section 5.3.2,
language improvements in Section 5.4

Adding support for them is a new feature in Python, so you need to add versionadded or versionchanged directives in the module documentation and add the corresponding entry in the What's New file.

You should also specify that the new filters (work? are supported? are available?) only with the specified XZ (library? file format?) version. Please add tests for new filters. They should produce expected result or raise an expected exception depending on the xz version.

I am not sure whether these constants should be defined if the underlying library does not support them. The new tests should show what is better.

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Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool.

If this change has little impact on Python users, wait for a maintainer to apply the skip news label instead.

@ivq

ivq commented Mar 17, 2024

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They are pretty new features (xz.tukaani.org/format/xz-file-format-1.2.0.txt):

 1.2.0 2024-01-19 Added RISC-V filter and updated URLs in
Sections 0.2 and 7. The URL of this
specification was changed.
1.1.0 2022-12-11 Added ARM64 filter and clarified 32-bit
ARM endianness in Section 5.3.2,
language improvements in Section 5.4

Adding support for them is a new feature in Python, so you need to add versionadded or versionchanged directives in the module documentation and add the corresponding entry in the What's New file.

You should also specify that the new filters (work? are supported? are available?) only with the specified XZ (library? file format?) version. Please add tests for new filters. They should produce expected result or raise an expected exception depending on the xz version.

I am not sure whether these constants should be defined if the underlying library does not support them. The new tests should show what is better.

OK. Done. Correct my if anything is missing.

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LGTM. You only need to add an entry in the What's New document.

Comment threadDoc/library/lzma.rst Outdated
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🤖 New build scheduled with the buildbot fleet by @furkanonder for commit 1a17fd5 🤖

Results will be shown at:

https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F115989%2Fmerge

The command will test the builders whose names match following regular expression: riscv64

The builders matched are:

  • riscv64 Ubuntu23 PR

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This PR is stale because it has been open for 30 days with no activity.

@github-actionsgithub-actionsBot added the stale Stale PR or inactive for long period of time. label Apr 15, 2026
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Let's remove the version attributes, they are still discussed.

@hugovk, any chance to include this in 3.15 (after excluding the discussed part)?

@github-actionsgithub-actionsBot removed the stale Stale PR or inactive for long period of time. label May 21, 2026
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This has been "ready" for two years, what would be the justification to include in 3.15 after the freeze?

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The main reason is my feeling of guilt. We could have merged it long ago, but once again we missed the deadline.

This is not critical feature, so if no, then no. It will be in 3.16 then.

@ivq
ivq requested a review from AA-Turner as a code ownerMay 27, 2026 14:05
Signed-off-by: Chien Wong <m@xv97.com>
@ivq
ivqforce-pushed the xz_bcj_filters branch from da8fed3 to 9cc998fCompareMay 27, 2026 14:08
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@ivq

ivq commented May 27, 2026

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The version attributes are removed. Hope it lands in 3.16.

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Signed-off-by: Chien Wong <m@xv97.com>
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var __re = new RegExp('^' + "github\\.com" + '
Skip to content

gh-115988: Add missing ARM64 and RISCV filter in lzma module - #115989

Merged
gpshead merged 28 commits into
python:mainfrom
ivq:xz_bcj_filters
May 28, 2026
Merged

gh-115988: Add missing ARM64 and RISCV filter in lzma module#115989
gpshead merged 28 commits into
python:mainfrom
ivq:xz_bcj_filters

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@ivq

@ivqivq commented Feb 27, 2024

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#115988

Example:

importlzmafilter= [
{ "id": lzma.FILTER_RISCV },
{ "id": lzma.FILTER_LZMA2 },
]
in_fn="in.bin"out_fn="out.bin"withopen(in_fn, mode="rb") asf:
in_data=f.read()
withlzma.open(out_fn, mode="wb", filters=filter) asf:
f.write(in_data)

📚 Documentation preview 📚: https://cpython-previews--115989.org.readthedocs.build/

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ghost commented Feb 27, 2024

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Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool.

If this change has little impact on Python users, wait for a maintainer to apply the skip news label instead.

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Does test_lzma test the existing constants in any way? Such as for validity of the spelling? If so, the new ones should be added.

Someone more familiar with lzma should do a commit review.

Comment threadDoc/library/lzma.rst Outdated
Comment threadModules/_lzmamodule.c
Comment threadModules/_lzmamodule.c
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A Python core developer has requested some changes be made to your pull request before we can consider merging it. If you could please address their requests along with any other requests in other reviews from core developers that would be appreciated.

Once you have made the requested changes, please leave a comment on this pull request containing the phrase I have made the requested changes; please review again. I will then notify any core developers who have left a review that you're ready for them to take another look at this pull request.

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Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool.

If this change has little impact on Python users, wait for a maintainer to apply the skip news label instead.

@ivq

ivq commented Feb 28, 2024

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I have made the requested changes; please review again.

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I cannot do a commit review of this as it is out of my expertise. I requested reviews from two coredevs who have edited the file most recently.

@serhiy-storchakaserhiy-storchaka left a comment

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They are pretty new features (https://xz.tukaani.org/format/xz-file-format-1.2.0.txt):

 1.2.0 2024-01-19 Added RISC-V filter and updated URLs in
Sections 0.2 and 7. The URL of this
specification was changed.
1.1.0 2022-12-11 Added ARM64 filter and clarified 32-bit
ARM endianness in Section 5.3.2,
language improvements in Section 5.4

Adding support for them is a new feature in Python, so you need to add versionadded or versionchanged directives in the module documentation and add the corresponding entry in the What's New file.

You should also specify that the new filters (work? are supported? are available?) only with the specified XZ (library? file format?) version. Please add tests for new filters. They should produce expected result or raise an expected exception depending on the xz version.

I am not sure whether these constants should be defined if the underlying library does not support them. The new tests should show what is better.

@bedevere-app

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Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool.

If this change has little impact on Python users, wait for a maintainer to apply the skip news label instead.

@ivq

ivq commented Mar 17, 2024

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They are pretty new features (xz.tukaani.org/format/xz-file-format-1.2.0.txt):

 1.2.0 2024-01-19 Added RISC-V filter and updated URLs in
Sections 0.2 and 7. The URL of this
specification was changed.
1.1.0 2022-12-11 Added ARM64 filter and clarified 32-bit
ARM endianness in Section 5.3.2,
language improvements in Section 5.4

Adding support for them is a new feature in Python, so you need to add versionadded or versionchanged directives in the module documentation and add the corresponding entry in the What's New file.

You should also specify that the new filters (work? are supported? are available?) only with the specified XZ (library? file format?) version. Please add tests for new filters. They should produce expected result or raise an expected exception depending on the xz version.

I am not sure whether these constants should be defined if the underlying library does not support them. The new tests should show what is better.

OK. Done. Correct my if anything is missing.

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LGTM. You only need to add an entry in the What's New document.

Comment threadDoc/library/lzma.rst Outdated
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🤖 New build scheduled with the buildbot fleet by @furkanonder for commit 1a17fd5 🤖

Results will be shown at:

https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F115989%2Fmerge

The command will test the builders whose names match following regular expression: riscv64

The builders matched are:

  • riscv64 Ubuntu23 PR

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This PR is stale because it has been open for 30 days with no activity.

@github-actionsgithub-actionsBot added the stale Stale PR or inactive for long period of time. label Apr 15, 2026
@serhiy-storchaka

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Let's remove the version attributes, they are still discussed.

@hugovk, any chance to include this in 3.15 (after excluding the discussed part)?

@github-actionsgithub-actionsBot removed the stale Stale PR or inactive for long period of time. label May 21, 2026
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This has been "ready" for two years, what would be the justification to include in 3.15 after the freeze?

@serhiy-storchaka

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The main reason is my feeling of guilt. We could have merged it long ago, but once again we missed the deadline.

This is not critical feature, so if no, then no. It will be in 3.16 then.

@ivq
ivq requested a review from AA-Turner as a code ownerMay 27, 2026 14:05
Signed-off-by: Chien Wong <m@xv97.com>
@ivq
ivqforce-pushed the xz_bcj_filters branch from da8fed3 to 9cc998fCompareMay 27, 2026 14:08
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Documentation build overview

📚 cpython-previews | 🛠️ Build #32887315 | 📁 Comparing b52d942 against main (55f2518)

🔍 Preview build

5 files changed · ± 5 modified

±Modified

@ivq

ivq commented May 27, 2026

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The version attributes are removed. Hope it lands in 3.16.

@gpshead
gpshead enabled auto-merge (squash) May 27, 2026 15:17
Comment threadDoc/whatsnew/3.16.rst Outdated
Signed-off-by: Chien Wong <m@xv97.com>
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gh-115988: Add missing ARM64 and RISCV filter in lzma module - #115989

Merged
gpshead merged 28 commits into
python:mainfrom
ivq:xz_bcj_filters
May 28, 2026
Merged

gh-115988: Add missing ARM64 and RISCV filter in lzma module#115989
gpshead merged 28 commits into
python:mainfrom
ivq:xz_bcj_filters

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@ivq

@ivqivq commented Feb 27, 2024

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#115988

Example:

importlzmafilter= [
{ "id": lzma.FILTER_RISCV },
{ "id": lzma.FILTER_LZMA2 },
]
in_fn="in.bin"out_fn="out.bin"withopen(in_fn, mode="rb") asf:
in_data=f.read()
withlzma.open(out_fn, mode="wb", filters=filter) asf:
f.write(in_data)

📚 Documentation preview 📚: https://cpython-previews--115989.org.readthedocs.build/

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Does test_lzma test the existing constants in any way? Such as for validity of the spelling? If so, the new ones should be added.

Someone more familiar with lzma should do a commit review.

Comment threadDoc/library/lzma.rst Outdated
Comment threadModules/_lzmamodule.c
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A Python core developer has requested some changes be made to your pull request before we can consider merging it. If you could please address their requests along with any other requests in other reviews from core developers that would be appreciated.

Once you have made the requested changes, please leave a comment on this pull request containing the phrase I have made the requested changes; please review again. I will then notify any core developers who have left a review that you're ready for them to take another look at this pull request.

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Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool.

If this change has little impact on Python users, wait for a maintainer to apply the skip news label instead.

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I have made the requested changes; please review again.

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I cannot do a commit review of this as it is out of my expertise. I requested reviews from two coredevs who have edited the file most recently.

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They are pretty new features (https://xz.tukaani.org/format/xz-file-format-1.2.0.txt):

 1.2.0 2024-01-19 Added RISC-V filter and updated URLs in
Sections 0.2 and 7. The URL of this
specification was changed.
1.1.0 2022-12-11 Added ARM64 filter and clarified 32-bit
ARM endianness in Section 5.3.2,
language improvements in Section 5.4

Adding support for them is a new feature in Python, so you need to add versionadded or versionchanged directives in the module documentation and add the corresponding entry in the What's New file.

You should also specify that the new filters (work? are supported? are available?) only with the specified XZ (library? file format?) version. Please add tests for new filters. They should produce expected result or raise an expected exception depending on the xz version.

I am not sure whether these constants should be defined if the underlying library does not support them. The new tests should show what is better.

@bedevere-app

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Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool.

If this change has little impact on Python users, wait for a maintainer to apply the skip news label instead.

@ivq

ivq commented Mar 17, 2024

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They are pretty new features (xz.tukaani.org/format/xz-file-format-1.2.0.txt):

 1.2.0 2024-01-19 Added RISC-V filter and updated URLs in
Sections 0.2 and 7. The URL of this
specification was changed.
1.1.0 2022-12-11 Added ARM64 filter and clarified 32-bit
ARM endianness in Section 5.3.2,
language improvements in Section 5.4

Adding support for them is a new feature in Python, so you need to add versionadded or versionchanged directives in the module documentation and add the corresponding entry in the What's New file.

You should also specify that the new filters (work? are supported? are available?) only with the specified XZ (library? file format?) version. Please add tests for new filters. They should produce expected result or raise an expected exception depending on the xz version.

I am not sure whether these constants should be defined if the underlying library does not support them. The new tests should show what is better.

OK. Done. Correct my if anything is missing.

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LGTM. You only need to add an entry in the What's New document.

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🤖 New build scheduled with the buildbot fleet by @furkanonder for commit 1a17fd5 🤖

Results will be shown at:

https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F115989%2Fmerge

The command will test the builders whose names match following regular expression: riscv64

The builders matched are:

  • riscv64 Ubuntu23 PR

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This PR is stale because it has been open for 30 days with no activity.

@github-actionsgithub-actionsBot added the stale Stale PR or inactive for long period of time. label Apr 15, 2026
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Let's remove the version attributes, they are still discussed.

@hugovk, any chance to include this in 3.15 (after excluding the discussed part)?

@github-actionsgithub-actionsBot removed the stale Stale PR or inactive for long period of time. label May 21, 2026
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This has been "ready" for two years, what would be the justification to include in 3.15 after the freeze?

@serhiy-storchaka

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The main reason is my feeling of guilt. We could have merged it long ago, but once again we missed the deadline.

This is not critical feature, so if no, then no. It will be in 3.16 then.

@ivq
ivq requested a review from AA-Turner as a code ownerMay 27, 2026 14:05
Signed-off-by: Chien Wong <m@xv97.com>
@ivq
ivqforce-pushed the xz_bcj_filters branch from da8fed3 to 9cc998fCompareMay 27, 2026 14:08
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Documentation build overview

📚 cpython-previews | 🛠️ Build #32887315 | 📁 Comparing b52d942 against main (55f2518)

🔍 Preview build

5 files changed · ± 5 modified

±Modified

@ivq

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The version attributes are removed. Hope it lands in 3.16.

@gpshead
gpshead enabled auto-merge (squash) May 27, 2026 15:17
Comment threadDoc/whatsnew/3.16.rst Outdated
Signed-off-by: Chien Wong <m@xv97.com>
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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms"); } } catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
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gh-115988: Add missing ARM64 and RISCV filter in lzma module - #115989

Merged
gpshead merged 28 commits into
python:mainfrom
ivq:xz_bcj_filters
May 28, 2026
Merged

gh-115988: Add missing ARM64 and RISCV filter in lzma module#115989
gpshead merged 28 commits into
python:mainfrom
ivq:xz_bcj_filters

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@ivq

@ivqivq commented Feb 27, 2024

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#115988

Example:

importlzmafilter= [
{ "id": lzma.FILTER_RISCV },
{ "id": lzma.FILTER_LZMA2 },
]
in_fn="in.bin"out_fn="out.bin"withopen(in_fn, mode="rb") asf:
in_data=f.read()
withlzma.open(out_fn, mode="wb", filters=filter) asf:
f.write(in_data)

📚 Documentation preview 📚: https://cpython-previews--115989.org.readthedocs.build/

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Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool.

If this change has little impact on Python users, wait for a maintainer to apply the skip news label instead.

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Does test_lzma test the existing constants in any way? Such as for validity of the spelling? If so, the new ones should be added.

Someone more familiar with lzma should do a commit review.

Comment threadDoc/library/lzma.rst Outdated
Comment threadModules/_lzmamodule.c
Comment threadModules/_lzmamodule.c
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A Python core developer has requested some changes be made to your pull request before we can consider merging it. If you could please address their requests along with any other requests in other reviews from core developers that would be appreciated.

Once you have made the requested changes, please leave a comment on this pull request containing the phrase I have made the requested changes; please review again. I will then notify any core developers who have left a review that you're ready for them to take another look at this pull request.

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Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool.

If this change has little impact on Python users, wait for a maintainer to apply the skip news label instead.

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I have made the requested changes; please review again.

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I cannot do a commit review of this as it is out of my expertise. I requested reviews from two coredevs who have edited the file most recently.

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They are pretty new features (https://xz.tukaani.org/format/xz-file-format-1.2.0.txt):

 1.2.0 2024-01-19 Added RISC-V filter and updated URLs in
Sections 0.2 and 7. The URL of this
specification was changed.
1.1.0 2022-12-11 Added ARM64 filter and clarified 32-bit
ARM endianness in Section 5.3.2,
language improvements in Section 5.4

Adding support for them is a new feature in Python, so you need to add versionadded or versionchanged directives in the module documentation and add the corresponding entry in the What's New file.

You should also specify that the new filters (work? are supported? are available?) only with the specified XZ (library? file format?) version. Please add tests for new filters. They should produce expected result or raise an expected exception depending on the xz version.

I am not sure whether these constants should be defined if the underlying library does not support them. The new tests should show what is better.

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Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool.

If this change has little impact on Python users, wait for a maintainer to apply the skip news label instead.

@ivq

ivq commented Mar 17, 2024

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They are pretty new features (xz.tukaani.org/format/xz-file-format-1.2.0.txt):

 1.2.0 2024-01-19 Added RISC-V filter and updated URLs in
Sections 0.2 and 7. The URL of this
specification was changed.
1.1.0 2022-12-11 Added ARM64 filter and clarified 32-bit
ARM endianness in Section 5.3.2,
language improvements in Section 5.4

Adding support for them is a new feature in Python, so you need to add versionadded or versionchanged directives in the module documentation and add the corresponding entry in the What's New file.

You should also specify that the new filters (work? are supported? are available?) only with the specified XZ (library? file format?) version. Please add tests for new filters. They should produce expected result or raise an expected exception depending on the xz version.

I am not sure whether these constants should be defined if the underlying library does not support them. The new tests should show what is better.

OK. Done. Correct my if anything is missing.

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LGTM. You only need to add an entry in the What's New document.

Comment threadDoc/library/lzma.rst Outdated
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🤖 New build scheduled with the buildbot fleet by @furkanonder for commit 1a17fd5 🤖

Results will be shown at:

https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F115989%2Fmerge

The command will test the builders whose names match following regular expression: riscv64

The builders matched are:

  • riscv64 Ubuntu23 PR

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This PR is stale because it has been open for 30 days with no activity.

@github-actionsgithub-actionsBot added the stale Stale PR or inactive for long period of time. label Apr 15, 2026
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Let's remove the version attributes, they are still discussed.

@hugovk, any chance to include this in 3.15 (after excluding the discussed part)?

@github-actionsgithub-actionsBot removed the stale Stale PR or inactive for long period of time. label May 21, 2026
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This has been "ready" for two years, what would be the justification to include in 3.15 after the freeze?

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The main reason is my feeling of guilt. We could have merged it long ago, but once again we missed the deadline.

This is not critical feature, so if no, then no. It will be in 3.16 then.

@ivq
ivq requested a review from AA-Turner as a code ownerMay 27, 2026 14:05
Signed-off-by: Chien Wong <m@xv97.com>
@ivq
ivqforce-pushed the xz_bcj_filters branch from da8fed3 to 9cc998fCompareMay 27, 2026 14:08
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📚 cpython-previews | 🛠️ Build #32887315 | 📁 Comparing b52d942 against main (55f2518)

🔍 Preview build

5 files changed · ± 5 modified

±Modified

@ivq

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The version attributes are removed. Hope it lands in 3.16.

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gpshead enabled auto-merge (squash) May 27, 2026 15:17
Comment threadDoc/whatsnew/3.16.rst Outdated
Signed-off-by: Chien Wong <m@xv97.com>
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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links"); } } catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); } })(); (function(){ try { var __m = "youtube.com"; var __re = new RegExp('^' + "youtube\\.com" + '
Skip to content

gh-115988: Add missing ARM64 and RISCV filter in lzma module - #115989

Merged
gpshead merged 28 commits into
python:mainfrom
ivq:xz_bcj_filters
May 28, 2026
Merged

gh-115988: Add missing ARM64 and RISCV filter in lzma module#115989
gpshead merged 28 commits into
python:mainfrom
ivq:xz_bcj_filters

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@ivq

@ivqivq commented Feb 27, 2024

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#115988

Example:

importlzmafilter= [
{ "id": lzma.FILTER_RISCV },
{ "id": lzma.FILTER_LZMA2 },
]
in_fn="in.bin"out_fn="out.bin"withopen(in_fn, mode="rb") asf:
in_data=f.read()
withlzma.open(out_fn, mode="wb", filters=filter) asf:
f.write(in_data)

📚 Documentation preview 📚: https://cpython-previews--115989.org.readthedocs.build/

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ghost commented Feb 27, 2024

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Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool.

If this change has little impact on Python users, wait for a maintainer to apply the skip news label instead.

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Does test_lzma test the existing constants in any way? Such as for validity of the spelling? If so, the new ones should be added.

Someone more familiar with lzma should do a commit review.

Comment threadDoc/library/lzma.rst Outdated
Comment threadModules/_lzmamodule.c
Comment threadModules/_lzmamodule.c
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A Python core developer has requested some changes be made to your pull request before we can consider merging it. If you could please address their requests along with any other requests in other reviews from core developers that would be appreciated.

Once you have made the requested changes, please leave a comment on this pull request containing the phrase I have made the requested changes; please review again. I will then notify any core developers who have left a review that you're ready for them to take another look at this pull request.

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Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool.

If this change has little impact on Python users, wait for a maintainer to apply the skip news label instead.

@ivq

ivq commented Feb 28, 2024

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I have made the requested changes; please review again.

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I cannot do a commit review of this as it is out of my expertise. I requested reviews from two coredevs who have edited the file most recently.

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They are pretty new features (https://xz.tukaani.org/format/xz-file-format-1.2.0.txt):

 1.2.0 2024-01-19 Added RISC-V filter and updated URLs in
Sections 0.2 and 7. The URL of this
specification was changed.
1.1.0 2022-12-11 Added ARM64 filter and clarified 32-bit
ARM endianness in Section 5.3.2,
language improvements in Section 5.4

Adding support for them is a new feature in Python, so you need to add versionadded or versionchanged directives in the module documentation and add the corresponding entry in the What's New file.

You should also specify that the new filters (work? are supported? are available?) only with the specified XZ (library? file format?) version. Please add tests for new filters. They should produce expected result or raise an expected exception depending on the xz version.

I am not sure whether these constants should be defined if the underlying library does not support them. The new tests should show what is better.

@bedevere-app

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Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool.

If this change has little impact on Python users, wait for a maintainer to apply the skip news label instead.

@ivq

ivq commented Mar 17, 2024

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They are pretty new features (xz.tukaani.org/format/xz-file-format-1.2.0.txt):

 1.2.0 2024-01-19 Added RISC-V filter and updated URLs in
Sections 0.2 and 7. The URL of this
specification was changed.
1.1.0 2022-12-11 Added ARM64 filter and clarified 32-bit
ARM endianness in Section 5.3.2,
language improvements in Section 5.4

Adding support for them is a new feature in Python, so you need to add versionadded or versionchanged directives in the module documentation and add the corresponding entry in the What's New file.

You should also specify that the new filters (work? are supported? are available?) only with the specified XZ (library? file format?) version. Please add tests for new filters. They should produce expected result or raise an expected exception depending on the xz version.

I am not sure whether these constants should be defined if the underlying library does not support them. The new tests should show what is better.

OK. Done. Correct my if anything is missing.

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LGTM. You only need to add an entry in the What's New document.

Comment threadDoc/library/lzma.rst Outdated
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🤖 New build scheduled with the buildbot fleet by @furkanonder for commit 1a17fd5 🤖

Results will be shown at:

https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F115989%2Fmerge

The command will test the builders whose names match following regular expression: riscv64

The builders matched are:

  • riscv64 Ubuntu23 PR

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This PR is stale because it has been open for 30 days with no activity.

@github-actionsgithub-actionsBot added the stale Stale PR or inactive for long period of time. label Apr 15, 2026
@serhiy-storchaka

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Let's remove the version attributes, they are still discussed.

@hugovk, any chance to include this in 3.15 (after excluding the discussed part)?

@github-actionsgithub-actionsBot removed the stale Stale PR or inactive for long period of time. label May 21, 2026
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This has been "ready" for two years, what would be the justification to include in 3.15 after the freeze?

@serhiy-storchaka

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The main reason is my feeling of guilt. We could have merged it long ago, but once again we missed the deadline.

This is not critical feature, so if no, then no. It will be in 3.16 then.

@ivq
ivq requested a review from AA-Turner as a code ownerMay 27, 2026 14:05
Signed-off-by: Chien Wong <m@xv97.com>
@ivq
ivqforce-pushed the xz_bcj_filters branch from da8fed3 to 9cc998fCompareMay 27, 2026 14:08
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Documentation build overview

📚 cpython-previews | 🛠️ Build #32887315 | 📁 Comparing b52d942 against main (55f2518)

🔍 Preview build

5 files changed · ± 5 modified

±Modified

@ivq

ivq commented May 27, 2026

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The version attributes are removed. Hope it lands in 3.16.

@gpshead
gpshead enabled auto-merge (squash) May 27, 2026 15:17
Comment threadDoc/whatsnew/3.16.rst Outdated
Signed-off-by: Chien Wong <m@xv97.com>
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9 participants

@ivq@terryjreedy@serhiy-storchaka@erkia@gpshead@furkanonder@bedevere-bot@hugovk@StanFromIreland
, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default"); } } catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
Skip to content

gh-115988: Add missing ARM64 and RISCV filter in lzma module - #115989

Merged
gpshead merged 28 commits into
python:mainfrom
ivq:xz_bcj_filters
May 28, 2026
Merged

gh-115988: Add missing ARM64 and RISCV filter in lzma module#115989
gpshead merged 28 commits into
python:mainfrom
ivq:xz_bcj_filters

Conversation

@ivq

@ivqivq commented Feb 27, 2024

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#115988

Example:

importlzmafilter= [
{ "id": lzma.FILTER_RISCV },
{ "id": lzma.FILTER_LZMA2 },
]
in_fn="in.bin"out_fn="out.bin"withopen(in_fn, mode="rb") asf:
in_data=f.read()
withlzma.open(out_fn, mode="wb", filters=filter) asf:
f.write(in_data)

📚 Documentation preview 📚: https://cpython-previews--115989.org.readthedocs.build/

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Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool.

If this change has little impact on Python users, wait for a maintainer to apply the skip news label instead.

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Does test_lzma test the existing constants in any way? Such as for validity of the spelling? If so, the new ones should be added.

Someone more familiar with lzma should do a commit review.

Comment threadDoc/library/lzma.rst Outdated
Comment threadModules/_lzmamodule.c
Comment threadModules/_lzmamodule.c
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A Python core developer has requested some changes be made to your pull request before we can consider merging it. If you could please address their requests along with any other requests in other reviews from core developers that would be appreciated.

Once you have made the requested changes, please leave a comment on this pull request containing the phrase I have made the requested changes; please review again. I will then notify any core developers who have left a review that you're ready for them to take another look at this pull request.

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Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool.

If this change has little impact on Python users, wait for a maintainer to apply the skip news label instead.

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I have made the requested changes; please review again.

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I cannot do a commit review of this as it is out of my expertise. I requested reviews from two coredevs who have edited the file most recently.

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They are pretty new features (https://xz.tukaani.org/format/xz-file-format-1.2.0.txt):

 1.2.0 2024-01-19 Added RISC-V filter and updated URLs in
Sections 0.2 and 7. The URL of this
specification was changed.
1.1.0 2022-12-11 Added ARM64 filter and clarified 32-bit
ARM endianness in Section 5.3.2,
language improvements in Section 5.4

Adding support for them is a new feature in Python, so you need to add versionadded or versionchanged directives in the module documentation and add the corresponding entry in the What's New file.

You should also specify that the new filters (work? are supported? are available?) only with the specified XZ (library? file format?) version. Please add tests for new filters. They should produce expected result or raise an expected exception depending on the xz version.

I am not sure whether these constants should be defined if the underlying library does not support them. The new tests should show what is better.

@bedevere-app

Copy link
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Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool.

If this change has little impact on Python users, wait for a maintainer to apply the skip news label instead.

@ivq

ivq commented Mar 17, 2024

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They are pretty new features (xz.tukaani.org/format/xz-file-format-1.2.0.txt):

 1.2.0 2024-01-19 Added RISC-V filter and updated URLs in
Sections 0.2 and 7. The URL of this
specification was changed.
1.1.0 2022-12-11 Added ARM64 filter and clarified 32-bit
ARM endianness in Section 5.3.2,
language improvements in Section 5.4

Adding support for them is a new feature in Python, so you need to add versionadded or versionchanged directives in the module documentation and add the corresponding entry in the What's New file.

You should also specify that the new filters (work? are supported? are available?) only with the specified XZ (library? file format?) version. Please add tests for new filters. They should produce expected result or raise an expected exception depending on the xz version.

I am not sure whether these constants should be defined if the underlying library does not support them. The new tests should show what is better.

OK. Done. Correct my if anything is missing.

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LGTM. You only need to add an entry in the What's New document.

Comment threadDoc/library/lzma.rst Outdated
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This PR is stale because it has been open for 30 days with no activity.

@github-actionsgithub-actionsBot added the stale Stale PR or inactive for long period of time. label Apr 15, 2026
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Let's remove the version attributes, they are still discussed.

@hugovk, any chance to include this in 3.15 (after excluding the discussed part)?

@github-actionsgithub-actionsBot removed the stale Stale PR or inactive for long period of time. label May 21, 2026
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This has been "ready" for two years, what would be the justification to include in 3.15 after the freeze?

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The main reason is my feeling of guilt. We could have merged it long ago, but once again we missed the deadline.

This is not critical feature, so if no, then no. It will be in 3.16 then.

@ivq
ivq requested a review from AA-Turner as a code ownerMay 27, 2026 14:05
Signed-off-by: Chien Wong <m@xv97.com>
@ivq
ivqforce-pushed the xz_bcj_filters branch from da8fed3 to 9cc998fCompareMay 27, 2026 14:08
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@ivq

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The version attributes are removed. Hope it lands in 3.16.

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Signed-off-by: Chien Wong <m@xv97.com>
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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers"); } } catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
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gh-115988: Add missing ARM64 and RISCV filter in lzma module - #115989

Merged
gpshead merged 28 commits into
python:mainfrom
ivq:xz_bcj_filters
May 28, 2026
Merged

gh-115988: Add missing ARM64 and RISCV filter in lzma module#115989
gpshead merged 28 commits into
python:mainfrom
ivq:xz_bcj_filters

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@ivq

@ivqivq commented Feb 27, 2024

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#115988

Example:

importlzmafilter= [
{ "id": lzma.FILTER_RISCV },
{ "id": lzma.FILTER_LZMA2 },
]
in_fn="in.bin"out_fn="out.bin"withopen(in_fn, mode="rb") asf:
in_data=f.read()
withlzma.open(out_fn, mode="wb", filters=filter) asf:
f.write(in_data)

📚 Documentation preview 📚: https://cpython-previews--115989.org.readthedocs.build/

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Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool.

If this change has little impact on Python users, wait for a maintainer to apply the skip news label instead.

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Does test_lzma test the existing constants in any way? Such as for validity of the spelling? If so, the new ones should be added.

Someone more familiar with lzma should do a commit review.

Comment threadDoc/library/lzma.rst Outdated
Comment threadModules/_lzmamodule.c
Comment threadModules/_lzmamodule.c
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A Python core developer has requested some changes be made to your pull request before we can consider merging it. If you could please address their requests along with any other requests in other reviews from core developers that would be appreciated.

Once you have made the requested changes, please leave a comment on this pull request containing the phrase I have made the requested changes; please review again. I will then notify any core developers who have left a review that you're ready for them to take another look at this pull request.

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Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool.

If this change has little impact on Python users, wait for a maintainer to apply the skip news label instead.

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I have made the requested changes; please review again.

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I cannot do a commit review of this as it is out of my expertise. I requested reviews from two coredevs who have edited the file most recently.

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They are pretty new features (https://xz.tukaani.org/format/xz-file-format-1.2.0.txt):

 1.2.0 2024-01-19 Added RISC-V filter and updated URLs in
Sections 0.2 and 7. The URL of this
specification was changed.
1.1.0 2022-12-11 Added ARM64 filter and clarified 32-bit
ARM endianness in Section 5.3.2,
language improvements in Section 5.4

Adding support for them is a new feature in Python, so you need to add versionadded or versionchanged directives in the module documentation and add the corresponding entry in the What's New file.

You should also specify that the new filters (work? are supported? are available?) only with the specified XZ (library? file format?) version. Please add tests for new filters. They should produce expected result or raise an expected exception depending on the xz version.

I am not sure whether these constants should be defined if the underlying library does not support them. The new tests should show what is better.

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Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool.

If this change has little impact on Python users, wait for a maintainer to apply the skip news label instead.

@ivq

ivq commented Mar 17, 2024

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They are pretty new features (xz.tukaani.org/format/xz-file-format-1.2.0.txt):

 1.2.0 2024-01-19 Added RISC-V filter and updated URLs in
Sections 0.2 and 7. The URL of this
specification was changed.
1.1.0 2022-12-11 Added ARM64 filter and clarified 32-bit
ARM endianness in Section 5.3.2,
language improvements in Section 5.4

Adding support for them is a new feature in Python, so you need to add versionadded or versionchanged directives in the module documentation and add the corresponding entry in the What's New file.

You should also specify that the new filters (work? are supported? are available?) only with the specified XZ (library? file format?) version. Please add tests for new filters. They should produce expected result or raise an expected exception depending on the xz version.

I am not sure whether these constants should be defined if the underlying library does not support them. The new tests should show what is better.

OK. Done. Correct my if anything is missing.

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LGTM. You only need to add an entry in the What's New document.

Comment threadDoc/library/lzma.rst Outdated
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🤖 New build scheduled with the buildbot fleet by @furkanonder for commit 1a17fd5 🤖

Results will be shown at:

https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F115989%2Fmerge

The command will test the builders whose names match following regular expression: riscv64

The builders matched are:

  • riscv64 Ubuntu23 PR

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This PR is stale because it has been open for 30 days with no activity.

@github-actionsgithub-actionsBot added the stale Stale PR or inactive for long period of time. label Apr 15, 2026
@serhiy-storchaka

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Let's remove the version attributes, they are still discussed.

@hugovk, any chance to include this in 3.15 (after excluding the discussed part)?

@github-actionsgithub-actionsBot removed the stale Stale PR or inactive for long period of time. label May 21, 2026
@hugovk

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This has been "ready" for two years, what would be the justification to include in 3.15 after the freeze?

@serhiy-storchaka

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The main reason is my feeling of guilt. We could have merged it long ago, but once again we missed the deadline.

This is not critical feature, so if no, then no. It will be in 3.16 then.

@ivq
ivq requested a review from AA-Turner as a code ownerMay 27, 2026 14:05
Signed-off-by: Chien Wong <m@xv97.com>
@ivq
ivqforce-pushed the xz_bcj_filters branch from da8fed3 to 9cc998fCompareMay 27, 2026 14:08
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Documentation build overview

📚 cpython-previews | 🛠️ Build #32887315 | 📁 Comparing b52d942 against main (55f2518)

🔍 Preview build

5 files changed · ± 5 modified

±Modified

@ivq

ivq commented May 27, 2026

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The version attributes are removed. Hope it lands in 3.16.

@gpshead
gpshead enabled auto-merge (squash) May 27, 2026 15:17
Comment threadDoc/whatsnew/3.16.rst Outdated
Signed-off-by: Chien Wong <m@xv97.com>
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9 participants

@ivq@terryjreedy@serhiy-storchaka@erkia@gpshead@furkanonder@bedevere-bot@hugovk@StanFromIreland
, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode"); } } catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); } })(); })();
Skip to content

gh-115988: Add missing ARM64 and RISCV filter in lzma module - #115989

Merged
gpshead merged 28 commits into
python:mainfrom
ivq:xz_bcj_filters
May 28, 2026
Merged

gh-115988: Add missing ARM64 and RISCV filter in lzma module#115989
gpshead merged 28 commits into
python:mainfrom
ivq:xz_bcj_filters

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@ivq

@ivqivq commented Feb 27, 2024

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#115988

Example:

importlzmafilter= [
{ "id": lzma.FILTER_RISCV },
{ "id": lzma.FILTER_LZMA2 },
]
in_fn="in.bin"out_fn="out.bin"withopen(in_fn, mode="rb") asf:
in_data=f.read()
withlzma.open(out_fn, mode="wb", filters=filter) asf:
f.write(in_data)

📚 Documentation preview 📚: https://cpython-previews--115989.org.readthedocs.build/

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ghost commented Feb 27, 2024

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All commit authors signed the Contributor License Agreement.
CLA signed

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Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool.

If this change has little impact on Python users, wait for a maintainer to apply the skip news label instead.

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Does test_lzma test the existing constants in any way? Such as for validity of the spelling? If so, the new ones should be added.

Someone more familiar with lzma should do a commit review.

Comment threadDoc/library/lzma.rst Outdated
Comment threadModules/_lzmamodule.c
Comment threadModules/_lzmamodule.c
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A Python core developer has requested some changes be made to your pull request before we can consider merging it. If you could please address their requests along with any other requests in other reviews from core developers that would be appreciated.

Once you have made the requested changes, please leave a comment on this pull request containing the phrase I have made the requested changes; please review again. I will then notify any core developers who have left a review that you're ready for them to take another look at this pull request.

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Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool.

If this change has little impact on Python users, wait for a maintainer to apply the skip news label instead.

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ivq commented Feb 28, 2024

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I have made the requested changes; please review again.

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I cannot do a commit review of this as it is out of my expertise. I requested reviews from two coredevs who have edited the file most recently.

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They are pretty new features (https://xz.tukaani.org/format/xz-file-format-1.2.0.txt):

 1.2.0 2024-01-19 Added RISC-V filter and updated URLs in
Sections 0.2 and 7. The URL of this
specification was changed.
1.1.0 2022-12-11 Added ARM64 filter and clarified 32-bit
ARM endianness in Section 5.3.2,
language improvements in Section 5.4

Adding support for them is a new feature in Python, so you need to add versionadded or versionchanged directives in the module documentation and add the corresponding entry in the What's New file.

You should also specify that the new filters (work? are supported? are available?) only with the specified XZ (library? file format?) version. Please add tests for new filters. They should produce expected result or raise an expected exception depending on the xz version.

I am not sure whether these constants should be defined if the underlying library does not support them. The new tests should show what is better.

@bedevere-app

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Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool.

If this change has little impact on Python users, wait for a maintainer to apply the skip news label instead.

@ivq

ivq commented Mar 17, 2024

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They are pretty new features (xz.tukaani.org/format/xz-file-format-1.2.0.txt):

 1.2.0 2024-01-19 Added RISC-V filter and updated URLs in
Sections 0.2 and 7. The URL of this
specification was changed.
1.1.0 2022-12-11 Added ARM64 filter and clarified 32-bit
ARM endianness in Section 5.3.2,
language improvements in Section 5.4

Adding support for them is a new feature in Python, so you need to add versionadded or versionchanged directives in the module documentation and add the corresponding entry in the What's New file.

You should also specify that the new filters (work? are supported? are available?) only with the specified XZ (library? file format?) version. Please add tests for new filters. They should produce expected result or raise an expected exception depending on the xz version.

I am not sure whether these constants should be defined if the underlying library does not support them. The new tests should show what is better.

OK. Done. Correct my if anything is missing.

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LGTM. You only need to add an entry in the What's New document.

Comment threadDoc/library/lzma.rst Outdated
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🤖 New build scheduled with the buildbot fleet by @furkanonder for commit 1a17fd5 🤖

Results will be shown at:

https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F115989%2Fmerge

The command will test the builders whose names match following regular expression: riscv64

The builders matched are:

  • riscv64 Ubuntu23 PR

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This PR is stale because it has been open for 30 days with no activity.

@github-actionsgithub-actionsBot added the stale Stale PR or inactive for long period of time. label Apr 15, 2026
@serhiy-storchaka

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Let's remove the version attributes, they are still discussed.

@hugovk, any chance to include this in 3.15 (after excluding the discussed part)?

@github-actionsgithub-actionsBot removed the stale Stale PR or inactive for long period of time. label May 21, 2026
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This has been "ready" for two years, what would be the justification to include in 3.15 after the freeze?

@serhiy-storchaka

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The main reason is my feeling of guilt. We could have merged it long ago, but once again we missed the deadline.

This is not critical feature, so if no, then no. It will be in 3.16 then.

@ivq
ivq requested a review from AA-Turner as a code ownerMay 27, 2026 14:05
Signed-off-by: Chien Wong <m@xv97.com>
@ivq
ivqforce-pushed the xz_bcj_filters branch from da8fed3 to 9cc998fCompareMay 27, 2026 14:08
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Documentation build overview

📚 cpython-previews | 🛠️ Build #32887315 | 📁 Comparing b52d942 against main (55f2518)

🔍 Preview build

5 files changed · ± 5 modified

±Modified

@ivq

ivq commented May 27, 2026

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The version attributes are removed. Hope it lands in 3.16.

@gpshead
gpshead enabled auto-merge (squash) May 27, 2026 15:17
Comment threadDoc/whatsnew/3.16.rst Outdated
Signed-off-by: Chien Wong <m@xv97.com>
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9 participants

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