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GeezerVison is showing github.com — Implement support for DLR get/set by filmor · Pull Request #2706 · pythonnet/pythonnet

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filmor commented Apr 18, 2026 •

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Implements #72 and should thus fix #2696.

@spkl Could you try out this branch?

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filmor requested a review from lostmsu

April 18, 2026 13:51

filmor force-pushed the dlr branch 3 times, most recently from 34eff30 to ac40869 Compare

April 18, 2026 17:58

filmor marked this pull request as ready for review

April 20, 2026 07:23

spkl commented Apr 20, 2026

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@filmor If I understand this correctly, one wouldn't even need the dynamic.py script anymore for DynamicObject access to work, correct? That seems great :)
To test this in our setup, can you point me to a wheel that I can install, or provide documentation how to build it?

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filmor commented Apr 20, 2026

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@spkl Yes, the dynamic support would be integrated. To build a wheel, the simplest way is to get uv and the .NET SDK installed on your machine, check out the repo and run uv build. That builds the wheel in dist/.

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spkl commented Apr 20, 2026 •

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OK so I did a little digging and found out that I can pip install . in the root directory of the pythonnet repository to install this version into my venv.
Edit: Is this wrong? Should I try again with uv?

Getting the value of dynamic properties seems to work, but I encountered a problem when setting dynamic properties. This is what I observed when running a script like this:

x = obj.MyProp
obj.MyProp = None
y = obj.MyProp

For line 1, TryGetMember is called for name "MyProp" and x will correctly be assigned the value returned from there.
For line 2, TrySetMember is NOT called.
For line 3, TryGetMember is NOT called, y will be assigned the value from line 2 (None), but that value is unknown to the .NET implementation.

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lostmsu reviewed

Apr 21, 2026

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src/runtime/Types/ClassBase.cs Resolved

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filmor force-pushed the dlr branch 4 times, most recently from fdfa219 to 6d1572e Compare

May 5, 2026 19:56

filmor commented May 6, 2026

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@spkl Could you test again whether this works for you?

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filmor force-pushed the dlr branch from 6d1572e to 88e8bd3 Compare

May 6, 2026 13:43

spkl commented May 6, 2026

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Will do ASAP and let you know

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spkl commented May 7, 2026

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OK @filmor, this is pretty great. With the current version from this branch and with all previous workarounds removed, all of our test cases pass. 🎉

Performance is also improved, which I could see in our two dedicated performance tests. These tests don't strictly measure pythonnet performance, but that is a significant part of them. Numbers are normalized to fractions, lower is better.

Variant	Test 1	Test 2
Python 3.12, pythonnet 3.0.5 + our own adaptation of filmors old DynamicObject workaround	1.0	1.0
Python 3.14, pythonnet 3.1.0rc0 + our own (problematic) workaround using codecs	1.18	1.04
Python 3.14, pythonnet with DLR support (this branch)	0.77	0.96

There is one significant behavioral difference that I observed: With past solutions, there was always an AttributeError when setting an attribute for which TrySetMember returns false (= which does not exist). With this branch, the attribute is now set on the Python side without any error. This can be problematic, because it can mask errors / typos in scripts and make troubleshooting harder. I don't know if this was intended. If it is, we can probably find a different solution.

I tried to find a workaround for that behavior and discovered something else where I'm not sure if it's correct: When throwing an exception in TrySetMember, the process crashes with a .NET exception, so there is no Python traceback to pinpoint the error location. In contrast, when throwing an exception in TryGetMember, it comes up as an AttributeError with Python traceback output.

Because we support running in different environments and Python versions, we probably need to implement automatic switching between DynamicObject workaround and first-class DLR support in pythonnet. Is there a way to find out if the currently loaded pythonnet module has DLR support? An information about the version would also work, but pythonnet currently has no __version__ attribute.

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filmor commented May 7, 2026

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I'll try to handle these cases, definitely not intentional :)

If you need to get a package's version in your code, please use importlib.metadata.version().

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filmor force-pushed the dlr branch from 88e8bd3 to d629b87 Compare

May 7, 2026 17:01

filmor requested a review from lostmsu

May 7, 2026 17:02

greateggsgreg added a commit to greateggsgreg/pythonnet that referenced this pull request

May 9, 2026


          Propagate exceptions from TryGetMember in tp_getattro_dlr_proxy

5c3421f

The dynamic getter swallowed any exception from TryGetMember and
returned default to Python with the prior AttributeError still set,
so user code observed a misleading AttributeError instead of the real
failure.

Set a Python exception in the catch arm. We use RuntimeError with the
message string rather than Converter.ToPython(e) because wrapping the
CLR exception object can trigger type initialisation that re-enters
this same slot on the live dynamic object, producing infinite
recursion.

Mirrors the symmetry already present in the setter (pythonnet#2706 review,
@lostmsu) and adds a regression test alongside the existing
ThrowingSetDynamicObject coverage.

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>

greateggsgreg mentioned this pull request

May 9, 2026

dlr branch fix - Propagate exceptions from TryGetMember in tp_getattro_dlr_proxy #2718

Merged

greateggsgreg added a commit to greateggsgreg/pythonnet that referenced this pull request

May 9, 2026


          Propagate exceptions from TryGetMember in tp_getattro_dlr_proxy

5d64310

The dynamic getter swallowed any exception from TryGetMember and
returned default to Python with the prior AttributeError still set,
so user code observed a misleading AttributeError instead of the real
failure.

Set a Python exception in the catch arm. We use RuntimeError with the
message string rather than Converter.ToPython(e) because wrapping the
CLR exception object can trigger type initialisation that re-enters
this same slot on the live dynamic object, producing infinite
recursion.

Mirrors the symmetry already present in the setter (pythonnet#2706 review,
@lostmsu) and adds a regression test alongside the existing
ThrowingSetDynamicObject coverage.

greateggsgreg commented May 10, 2026 •

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#2718 should fix the TryGetMember issue highlighted above.

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filmor pushed a commit that referenced this pull request

May 11, 2026


          Propagate exceptions from TryGetMember in tp_getattro_dlr_proxy (#2718)

da48ef7

The dynamic getter swallowed any exception from TryGetMember and
returned default to Python with the prior AttributeError still set,
so user code observed a misleading AttributeError instead of the real
failure.

Set a Python exception in the catch arm. We use RuntimeError with the
message string rather than Converter.ToPython(e) because wrapping the
CLR exception object can trigger type initialisation that re-enters
this same slot on the live dynamic object, producing infinite
recursion.

Mirrors the symmetry already present in the setter (#2706 review,
@lostmsu) and adds a regression test alongside the existing
ThrowingSetDynamicObject coverage.

alexchandel commented May 11, 2026

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You want to rebase this and retest with the TryGetMember fix?

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greateggsgreg added a commit to greateggsgreg/pythonnet that referenced this pull request

May 12, 2026


          Cache HasClrMember and align DLR setter exception path

bcf8c0d

- Cache HasClrMember reflection per (Type, name) so tp_getattro_dlr_proxy
  / tp_setattro_dlr_proxy avoid repeated GetMember() calls on every
  attribute access of DLR-aware objects.

- Mirror tp_setattro_dlr_proxy's catch arm to the getter's safer
  SetError(RuntimeError, e.Message) shape instead of SetError(Exception),
  keeping both slots re-entry-safe on live dynamic objects.

Related to pythonnet#2706.

filmor pushed a commit that referenced this pull request

May 12, 2026


          Propagate exceptions from TryGetMember in tp_getattro_dlr_proxy (#2718)

93c8e38

The dynamic getter swallowed any exception from TryGetMember and
returned default to Python with the prior AttributeError still set,
so user code observed a misleading AttributeError instead of the real
failure.

Set a Python exception in the catch arm. We use RuntimeError with the
message string rather than Converter.ToPython(e) because wrapping the
CLR exception object can trigger type initialisation that re-enters
this same slot on the live dynamic object, producing infinite
recursion.

Mirrors the symmetry already present in the setter (#2706 review,
@lostmsu) and adds a regression test alongside the existing
ThrowingSetDynamicObject coverage.

filmor force-pushed the dlr branch from da48ef7 to 93c8e38 Compare

May 12, 2026 19:56

filmor pushed a commit that referenced this pull request

May 12, 2026


          Cache HasClrMember and align DLR setter exception path

fef6f35

- Cache HasClrMember reflection per (Type, name) so tp_getattro_dlr_proxy
  / tp_setattro_dlr_proxy avoid repeated GetMember() calls on every
  attribute access of DLR-aware objects.

- Mirror tp_setattro_dlr_proxy's catch arm to the getter's safer
  SetError(RuntimeError, e.Message) shape instead of SetError(Exception),
  keeping both slots re-entry-safe on live dynamic objects.

Related to #2706.

filmor pushed a commit that referenced this pull request

May 12, 2026


          Propagate exceptions from TryGetMember in tp_getattro_dlr_proxy (#2718)

789726c

The dynamic getter swallowed any exception from TryGetMember and
returned default to Python with the prior AttributeError still set,
so user code observed a misleading AttributeError instead of the real
failure.

Set a Python exception in the catch arm. We use RuntimeError with the
message string rather than Converter.ToPython(e) because wrapping the
CLR exception object can trigger type initialisation that re-enters
this same slot on the live dynamic object, producing infinite
recursion.

Mirrors the symmetry already present in the setter (#2706 review,
@lostmsu) and adds a regression test alongside the existing
ThrowingSetDynamicObject coverage.

filmor force-pushed the dlr branch from fef6f35 to e99538e Compare

May 12, 2026 20:25

filmor pushed a commit that referenced this pull request

May 12, 2026


          Cache HasClrMember and align DLR setter exception path

e99538e

- Cache HasClrMember reflection per (Type, name) so tp_getattro_dlr_proxy
  / tp_setattro_dlr_proxy avoid repeated GetMember() calls on every
  attribute access of DLR-aware objects.

- Mirror tp_setattro_dlr_proxy's catch arm to the getter's safer
  SetError(RuntimeError, e.Message) shape instead of SetError(Exception),
  keeping both slots re-entry-safe on live dynamic objects.

Related to #2706.

filmor pushed a commit that referenced this pull request

May 13, 2026


          Propagate exceptions from TryGetMember in tp_getattro_dlr_proxy (#2718)

a2ed667

The dynamic getter swallowed any exception from TryGetMember and
returned default to Python with the prior AttributeError still set,
so user code observed a misleading AttributeError instead of the real
failure.

Set a Python exception in the catch arm. We use RuntimeError with the
message string rather than Converter.ToPython(e) because wrapping the
CLR exception object can trigger type initialisation that re-enters
this same slot on the live dynamic object, producing infinite
recursion.

Mirrors the symmetry already present in the setter (#2706 review,
@lostmsu) and adds a regression test alongside the existing
ThrowingSetDynamicObject coverage.

filmor pushed a commit that referenced this pull request

May 13, 2026


          Cache HasClrMember and align DLR setter exception path

a3c2069

- Cache HasClrMember reflection per (Type, name) so tp_getattro_dlr_proxy
  / tp_setattro_dlr_proxy avoid repeated GetMember() calls on every
  attribute access of DLR-aware objects.

- Mirror tp_setattro_dlr_proxy's catch arm to the getter's safer
  SetError(RuntimeError, e.Message) shape instead of SetError(Exception),
  keeping both slots re-entry-safe on live dynamic objects.

Related to #2706.

filmor force-pushed the dlr branch from e99538e to a3c2069 Compare

May 13, 2026 05:28

filmor commented May 13, 2026

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@spkl Can you please test out the latest version?
@greateggsgreg I stole your pending commit that includes the caching, I hope that's fine :)
@lostmsu One last round of review? Once this is through, I would merge this and publish it as 3.1.0-rc2, we can discuss on a separate issue (after I update the Changelog to reflect the actual changes) whether we want to release it as 4.0. I don't want to delay the release any further :)

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spkl commented May 13, 2026

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@filmor All good from my side 👍

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filmor and others added 5 commits

May 15, 2026 21:57


          Implement support for DLR get/set

5dacfb4


          Use explicit IsNull on BorrowedReference

69ba861


          Catch errors in setting/deleting properties

2408c43

- Catch exceptions in TrySet/DeleteMember
- Convert the exceptions into Python exceptions
- Add tests for the remaining cases
- Add a note on why the field has to be lazily initialized (general
  issue with derived classes)


          Propagate exceptions from TryGetMember in tp_getattro_dlr_proxy (#2718)

8b12b56

The dynamic getter swallowed any exception from TryGetMember and
returned default to Python with the prior AttributeError still set,
so user code observed a misleading AttributeError instead of the real
failure.

Set a Python exception in the catch arm. We use RuntimeError with the
message string rather than Converter.ToPython(e) because wrapping the
CLR exception object can trigger type initialisation that re-enters
this same slot on the live dynamic object, producing infinite
recursion.

Mirrors the symmetry already present in the setter (#2706 review,
@lostmsu) and adds a regression test alongside the existing
ThrowingSetDynamicObject coverage.


          Cache HasClrMember and align DLR setter exception path

3a08990

- Cache HasClrMember reflection per (Type, name) so tp_getattro_dlr_proxy
  / tp_setattro_dlr_proxy avoid repeated GetMember() calls on every
  attribute access of DLR-aware objects.

- Mirror tp_setattro_dlr_proxy's catch arm to the getter's safer
  SetError(RuntimeError, e.Message) shape instead of SetError(Exception),
  keeping both slots re-entry-safe on live dynamic objects.

Related to #2706.

filmor force-pushed the dlr branch from a3c2069 to 3a08990 Compare

May 15, 2026 19:57

filmor merged commit 27caf5c into master

May 15, 2026

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filmor deleted the dlr branch

May 15, 2026 19:58

This was referenced May 24, 2026

Bump pythonnet from 3.0.5 to 3.1.0 zcsizmadia/PyDotNet#12

Merged

chore: Bump pythonnet from 3.0.5 to 3.1.0 apache/arrow-dotnet#364

Merged

CurtHagenlocher pushed a commit to apache/arrow-dotnet that referenced this pull request

May 25, 2026


          chore: Bump pythonnet from 3.0.5 to 3.1.0 (#364)

5c6a0c9

Updated [pythonnet](https://github.com/pythonnet/pythonnet) from 3.0.5
to 3.1.0.

<details>
<summary>Release notes</summary>

_Sourced from [pythonnet's
releases](https://github.com/pythonnet/pythonnet/releases)._

## 3.1.0

## What's Changed
* ci: properly exclude job by @RobPasMue in
pythonnet/pythonnet#2542
* `__delitem__` for `IList<T>` and `IDictionary<K,V>` by @lostmsu in
pythonnet/pythonnet#2533
* Fix docs workflow by @filmor in
pythonnet/pythonnet#2584
* Drop EOLd Python versions by @filmor in
pythonnet/pythonnet#2632
* Bump setuptools and adjust license information by @filmor in
pythonnet/pythonnet#2633
* Minimal .NET 8 usage changes by @filmor in
pythonnet/pythonnet#2634
* Drop performance tests by @filmor in
pythonnet/pythonnet#2636
* Properly detect availability of BinaryFormatter by @filmor in
pythonnet/pythonnet#2639
* Use last compiler toolset version that support .NET 8 by @filmor in
pythonnet/pythonnet#2640
* Add dependabot file by @filmor in
pythonnet/pythonnet#2642
* Use official ARM runners by @filmor in
pythonnet/pythonnet#2641
* Bump actions/upload-pages-artifact from 3 to 4 by @dependabot[bot] in
pythonnet/pythonnet#2644
* Bump actions/setup-python from 2 to 6 by @dependabot[bot] in
pythonnet/pythonnet#2646
* Bump actions/checkout from 2 to 5 by @dependabot[bot] in
pythonnet/pythonnet#2648
* Bump actions/setup-dotnet from 1 to 5 by @dependabot[bot] in
pythonnet/pythonnet#2645
* Use uv and derive as much as possible from the environment, if
available by @filmor in
pythonnet/pythonnet#2652
* Fixes for the uv CI by @filmor in
pythonnet/pythonnet#2654
* Bump astral-sh/setup-uv from 6 to 7 by @dependabot[bot] in
pythonnet/pythonnet#2656
* Bump actions/checkout from 5 to 6 by @dependabot[bot] in
pythonnet/pythonnet#2663
* Ensure that the tests work even if BinaryFormatter is not available by
@filmor in pythonnet/pythonnet#2638
* Bump NUnit3TestAdapter from 5.2.0 to 6.0.0 by @dependabot[bot] in
pythonnet/pythonnet#2667
* Fix line endings by @filmor in
pythonnet/pythonnet#2668
* Switch to .NET SDK 10 by @lostmsu in
pythonnet/pythonnet#2684
* Python 3.14 by @filmor in
pythonnet/pythonnet#2611
* CI Improvements by @filmor in
pythonnet/pythonnet#2669
* Bump System.Reflection.Emit from 4.3.0 to 4.7.0 by @dependabot[bot]
in pythonnet/pythonnet#2694
* Bump pytest from 9.0.2 to 9.0.3 in the uv group across 1 directory by
@dependabot[bot] in pythonnet/pythonnet#2705
* CI Improvements by @filmor in
pythonnet/pythonnet#2707
* Fix method memleak test by @filmor in
pythonnet/pythonnet#2708
* Bump actions/upload-pages-artifact from 4 to 5 by @dependabot[bot] in
pythonnet/pythonnet#2709
* Update furo requirement from >=2022.9.15 to >=2025.12.19 by
@dependabot[bot] in pythonnet/pythonnet#2711
* Move documentation deps to pyproject.toml by @filmor in
pythonnet/pythonnet#2714
* Support .NET Framework 4.6.1 by @Metadorius in
pythonnet/pythonnet#2701
* Fix wheel tags by @filmor in
pythonnet/pythonnet#2716
* Name missing from __all__ on re-import by @filmor in
pythonnet/pythonnet#2717
* Add context manager protocol for .NET IDisposable types by
@den-run-ai in pythonnet/pythonnet#2568
* Fix MethodBinding/OverloadMapper memory leak (#691) by
@greateggsgreg in pythonnet/pythonnet#2719
* Bump urllib3 from 2.6.3 to 2.7.0 in the uv group across 1 directory by
@dependabot[bot] in pythonnet/pythonnet#2723
* Update NUnit by @filmor in
pythonnet/pythonnet#2724
* Silence compile-time warnings by @filmor in
pythonnet/pythonnet#2725
* Implement support for DLR get/set by @filmor in
pythonnet/pythonnet#2706
* Bump idna from 3.13 to 3.15 in the uv group across 1 directory by
@dependabot[bot] in pythonnet/pythonnet#2726

## New Contributors
* @RobPasMue made their first contribution in
pythonnet/pythonnet#2542
* @dependabot[bot] made their first contribution in
pythonnet/pythonnet#2644
* @Metadorius made their first contribution in
pythonnet/pythonnet#2701

**Full Changelog**:
pythonnet/pythonnet@v3.0.5...v3.1.0

## 3.1.0-rc1

## What's Changed
* CI Improvements by @filmor in
pythonnet/pythonnet#2669
* Bump System.Reflection.Emit from 4.3.0 to 4.7.0 by @dependabot[bot]
in pythonnet/pythonnet#2694
* Bump pytest from 9.0.2 to 9.0.3 in the uv group across 1 directory by
@dependabot[bot] in pythonnet/pythonnet#2705
* CI Improvements by @filmor in
pythonnet/pythonnet#2707
* Fix method memleak test by @filmor in
pythonnet/pythonnet#2708
* Bump actions/upload-pages-artifact from 4 to 5 by @dependabot[bot] in
pythonnet/pythonnet#2709
* Update furo requirement from >=2022.9.15 to >=2025.12.19 by
@dependabot[bot] in pythonnet/pythonnet#2711
* Move documentation deps to pyproject.toml by @filmor in
pythonnet/pythonnet#2714
* Support .NET Framework 4.6.1 by @Metadorius in
pythonnet/pythonnet#2701
* Fix wheel tags by @filmor in
pythonnet/pythonnet#2716
* Name missing from __all__ on re-import by @filmor in
pythonnet/pythonnet#2717
* Add context manager protocol for .NET IDisposable types by
@den-run-ai in pythonnet/pythonnet#2568
* Fix MethodBinding/OverloadMapper memory leak (#691) by
@greateggsgreg in pythonnet/pythonnet#2719
* Bump urllib3 from 2.6.3 to 2.7.0 in the uv group across 1 directory by
@dependabot[bot] in pythonnet/pythonnet#2723
* Update NUnit by @filmor in
pythonnet/pythonnet#2724
* Silence compile-time warnings by @filmor in
pythonnet/pythonnet#2725
* Implement support for DLR get/set by @filmor in
pythonnet/pythonnet#2706

## New Contributors
* @Metadorius made their first contribution in
pythonnet/pythonnet#2701

**Full Changelog**:
pythonnet/pythonnet@v3.1.0-rc0...v3.1.0-rc1

## 3.1.0-rc0

## What's Changed
* ci: properly exclude job by @RobPasMue in
pythonnet/pythonnet#2542
* `__delitem__` for `IList<T>` and `IDictionary<K,V>` by @lostmsu in
pythonnet/pythonnet#2533
* Fix docs workflow by @filmor in
pythonnet/pythonnet#2584
* Drop EOLd Python versions by @filmor in
pythonnet/pythonnet#2632
* Bump setuptools and adjust license information by @filmor in
pythonnet/pythonnet#2633
* Minimal .NET 8 usage changes by @filmor in
pythonnet/pythonnet#2634
* Drop performance tests by @filmor in
pythonnet/pythonnet#2636
* Properly detect availability of BinaryFormatter by @filmor in
pythonnet/pythonnet#2639
* Use last compiler toolset version that support .NET 8 by @filmor in
pythonnet/pythonnet#2640
* Add dependabot file by @filmor in
pythonnet/pythonnet#2642
* Use official ARM runners by @filmor in
pythonnet/pythonnet#2641
* Use uv and derive as much as possible from the environment, if
available by @filmor in
pythonnet/pythonnet#2652
* Fixes for the uv CI by @filmor in
pythonnet/pythonnet#2654
* Ensure that the tests work even if BinaryFormatter is not available by
@filmor in pythonnet/pythonnet#2638
* Fix line endings by @filmor in
pythonnet/pythonnet#2668
* Switch to .NET SDK 10 by @lostmsu in
pythonnet/pythonnet#2684
* Python 3.14 by @filmor in
pythonnet/pythonnet#2611

## New Contributors
* @RobPasMue made their first contribution in
pythonnet/pythonnet#2542
* @dependabot[bot] made their first contribution in
pythonnet/pythonnet#2644

**Full Changelog**:
pythonnet/pythonnet@v3.0.5...v3.1.0-rc0

Commits viewable in [compare
view](pythonnet/pythonnet@v3.0.5...v3.1.0).
</details>

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May 25, 2026

🔼 NuGet: Bump pythonnet from 3.0.5 to 3.1.0 Kestrun/Kestrun#411

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Oct 10, 2026

Bump pythonnet from 3.0.5 to 3.2.1 baleti/revit-ballet#3

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Oct 28, 2026

build: Bump pythonnet from 3.0.5 to 3.2.1 akuro17/StockAnalyzer-OSS#89

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Nov 10, 2026

MINOR: [C#] Bump pythonnet from 3.0.4 to 3.2.1 sg-scale/arrow--apache-arrow-18.1.0#10

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DynamicObject support script no longer working since version 3.1.0rc0

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