From 499c5e6a03b3997f32266815e47b7c71fb48d7b6 Mon Sep 17 00:00:00 2001
From: "Hans J. Johnson" <hans-johnson@uiowa.edu>
Date: Sat, 20 Jun 2026 12:06:59 -0500
Subject: [PATCH 1/4] COMP: Support SWIG 4.4.1 multi-phase init in Python
 wrapping
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

ITK packs several SWIG modules per shared library and injects C that calls
PyInit__<X>Python() and stores the return directly in sys.modules. SWIG 4.4
(PEP 489 multi-phase init) makes PyInit_* return a raw PyModuleDef rather than
a populated module, so the proxy fails at import with 'moduledef' object has no
attribute 'delete_SwigPyIterator'. Detect a returned def at runtime and
instantiate it via PyModule_FromDefAndSpec + PyModule_ExecDef; the single-phase
(<=4.3) path is unchanged. All APIs used are Limited-API-safe (>=3.5).

Pin the abi3 floor to a single cached source of truth
(_ITK_MINIMUM_SUPPORTED_LIMITED_API_VERSION = 3.11) shared by the Limited-API
auto-detect and the USE_SABI setting, so 3.11+ builds are abi3 and load on 3.11.

Assisted-by: Claude Code — root-cause analysis and local 3.11/3.13 validation
---
 CMake/ITKSetPython3Vars.cmake                 | 12 +++++-
 Wrapping/Generators/Python/CMakeLists.txt     | 37 +++++++++++++++++--
 .../macro_files/itk_end_wrap_module.cmake     |  2 +-
 3 files changed, 44 insertions(+), 7 deletions(-)

diff --git a/CMake/ITKSetPython3Vars.cmake b/CMake/ITKSetPython3Vars.cmake
index 061fde1476e..e3a9cd01e6d 100644
--- a/CMake/ITKSetPython3Vars.cmake
+++ b/CMake/ITKSetPython3Vars.cmake
@@ -58,7 +58,14 @@ else()
   set(ITK_WRAP_PYTHON_VERSION "${Python3_VERSION}")
 
   # start section to define package components based on LIMITED_API support and choices
-  set(_ITK_MINIMUM_SUPPORTED_LIMITED_API_VERSION 3.11)
+  # Cached so the abi3 floor is a single source of truth shared with the module
+  # wrapping macros (itk_end_wrap_module.cmake USE_SABI).
+  set(
+    _ITK_MINIMUM_SUPPORTED_LIMITED_API_VERSION
+    3.11
+    CACHE INTERNAL
+    "Minimum Python minor version for the abi3 / Limited API floor"
+  )
 
   # Force ITK_WRAP_PYTHON_VERSION if SKBUILD_SABI_COMPONENT requests it
   string(
@@ -173,7 +180,8 @@ else()
   endif()
   unset(_missing_required_component)
   unset(_python_find_components)
-  unset(_ITK_MINIMUM_SUPPORTED_LIMITED_API_VERSION)
+  # _ITK_MINIMUM_SUPPORTED_LIMITED_API_VERSION is cached (INTERNAL) and intentionally
+  # left set so itk_end_wrap_module.cmake can pin USE_SABI to the same floor.
   # end section to define package components based on LIMITED_API support and choices
   if(DEFINED _specified_Python3_EXECUTABLE)
     set(
diff --git a/Wrapping/Generators/Python/CMakeLists.txt b/Wrapping/Generators/Python/CMakeLists.txt
index e4fd7bad312..0efaade4d1b 100644
--- a/Wrapping/Generators/Python/CMakeLists.txt
+++ b/Wrapping/Generators/Python/CMakeLists.txt
@@ -495,10 +495,39 @@ macro(itk_end_wrap_submodule_python group_name)
   PyObject * ${base_name}AlreadyImported = PyDict_GetItemString(sysModules, \"itk._${base_name}Python\");
   if(${base_name}AlreadyImported == NULL)
     {
-    PyImport_AddModule(\"itk._${base_name}Python\");
-    PyObject * ${base_name}Module = PyInit__${base_name}Python();
-    PyDict_SetItemString(sysModules, \"itk._${base_name}Python\", ${base_name}Module);
-    SWIG_Py_DECREF( ${base_name}Module);
+    PyObject * ${base_name}Init = PyInit__${base_name}Python();
+    PyObject * ${base_name}Module = ${base_name}Init;
+    if (${base_name}Init != NULL && !PyModule_Check(${base_name}Init))
+      {
+      // SWIG >= 4.4 uses PEP 489 multi-phase init: PyInit_* returns a
+      // PyModuleDef that must be instantiated against a spec, not used directly.
+      PyObject * ${base_name}Spec = NULL;
+      PyObject * ${base_name}Machinery = PyImport_ImportModule(\"importlib.machinery\");
+      if (${base_name}Machinery != NULL)
+        {
+        PyObject * ${base_name}SpecType = PyObject_GetAttrString(${base_name}Machinery, \"ModuleSpec\");
+        if (${base_name}SpecType != NULL)
+          {
+          ${base_name}Spec = PyObject_CallFunction(${base_name}SpecType, \"sO\", \"itk._${base_name}Python\", Py_None);
+          SWIG_Py_DECREF(${base_name}SpecType);
+          }
+        SWIG_Py_DECREF(${base_name}Machinery);
+        }
+      ${base_name}Module = PyModule_FromDefAndSpec((PyModuleDef *)${base_name}Init, ${base_name}Spec);
+      if (${base_name}Spec != NULL)
+        {
+        SWIG_Py_DECREF(${base_name}Spec);
+        }
+      if (${base_name}Module != NULL)
+        {
+        PyModule_ExecDef(${base_name}Module, (PyModuleDef *)${base_name}Init);
+        }
+      }
+    if (${base_name}Module != NULL)
+      {
+      PyDict_SetItemString(sysModules, \"itk._${base_name}Python\", ${base_name}Module);
+      SWIG_Py_DECREF(${base_name}Module);
+      }
     }
 "
   )
diff --git a/Wrapping/macro_files/itk_end_wrap_module.cmake b/Wrapping/macro_files/itk_end_wrap_module.cmake
index bfb53dd9796..04bde56dc4b 100644
--- a/Wrapping/macro_files/itk_end_wrap_module.cmake
+++ b/Wrapping/macro_files/itk_end_wrap_module.cmake
@@ -487,7 +487,7 @@ ${DO_NOT_WAIT_FOR_THREADS_CALLS}
       set(
         _Python3_ABI_SETTINGS
         USE_SABI
-        ${Python3_VERSION_MAJOR}.${Python3_VERSION_MINOR}
+        ${_ITK_MINIMUM_SUPPORTED_LIMITED_API_VERSION}
         WITH_SOABI
       )
     else()

From 5ac235be0e4a6c5978a7ed40553d206cf07c56ad Mon Sep 17 00:00:00 2001
From: "Hans J. Johnson" <hans-johnson@uiowa.edu>
Date: Sat, 20 Jun 2026 12:07:03 -0500
Subject: [PATCH 2/4] COMP: Build ITK Python wrapping with pixi-supplied SWIG
 4.4.1 and CastXML

Add swig (>=4.4.1), castxml, and ccache to the python pixi feature and pass
ITK_USE_SYSTEM_SWIG/ITK_USE_SYSTEM_CASTXML in configure-python, so wrapping uses
the conda-forge toolchain instead of the internal download/build.
---
 pixi.lock      | 442 +++++++++++++++++++++++++++++++++++++++++++++++++
 pyproject.toml |   7 +
 2 files changed, 449 insertions(+)

diff --git a/pixi.lock b/pixi.lock
index b26f798af57..0bea1db9e08 100644
--- a/pixi.lock
+++ b/pixi.lock
@@ -1591,6 +1591,8 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/linux-64/bzip2-1.0.8-hda65f42_8.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/c-ares-1.34.5-hb9d3cd8_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/c-compiler-1.11.0-h4d9bdce_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/castxml-0.7.0-hde8d07d_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/ccache-4.13.6-hedf47ba_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/cmake-4.1.2-hc85cc9f_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/conda-gcc-specs-14.3.0-hb991d5c_7.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/cxx-compiler-1.11.0-hfcd1e18_0.conda
@@ -1600,11 +1602,13 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/linux-64/gxx-14.3.0-he448592_7.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/gxx_impl_linux-64-14.3.0-he663afc_7.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/gxx_linux-64-14.3.0-h95f728e_12.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/icu-78.3-h33c6efd_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/keyutils-1.6.3-hb9d3cd8_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/krb5-1.21.3-h659f571_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/ld_impl_linux-64-2.44-h1aa0949_4.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/libblas-3.9.0-38_h4a7cf45_openblas.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/libcblas-3.9.0-38_h0358290_openblas.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/libclang-cpp20.1-20.1.8-default_h99862b1_16.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/libcurl-8.16.0-h4e3cde8_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/libedit-3.1.20250104-pl5321h7949ede_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/libev-4.33-hd590300_2.conda
@@ -1615,7 +1619,10 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/linux-64/libgfortran-15.2.0-h69a702a_7.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/libgfortran5-15.2.0-hcd61629_7.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/libgomp-15.2.0-h767d61c_7.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/libhiredis-1.3.0-h5888daf_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/libiconv-1.18-h3b78370_2.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/liblapack-3.9.0-38_h47877c9_openblas.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/libllvm20-20.1.8-hf7376ad_1.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/liblzma-5.8.1-hb9d3cd8_2.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/libmpdec-4.0.0-hb9d3cd8_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/libnghttp2-1.67.0-had1ee68_0.conda
@@ -1627,15 +1634,20 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/linux-64/libstdcxx-ng-15.2.0-h4852527_7.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/libuuid-2.41.2-he9a06e4_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/libuv-1.51.0-hb03c661_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/libxml2-16-2.15.1-hca6bf5a_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/libxml2-2.15.1-he237659_1.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/libzlib-1.3.1-hb9d3cd8_2.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/ncurses-6.5-h2d0b736_3.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/ninja-1.13.1-h171cf75_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/numpy-2.3.4-py313hf6604e3_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/openssl-3.5.4-h26f9b46_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/pcre2-10.47-haa7fec5_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/python-3.13.9-hc97d973_101_cp313.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/readline-8.2-h8c095d6_2.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/rhash-1.4.6-hb9d3cd8_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/swig-4.4.1-h7a96c5f_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/tk-8.6.13-noxft_hd72426e_102.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-64/xxhash-0.8.3-hb47aa4a_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-64/zstd-1.5.7-hb8e6e7a_2.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/ca-certificates-2025.10.5-hbd8a1cb_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/colorama-0.4.6-pyhd8ed1ab_1.conda
@@ -1661,6 +1673,8 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/bzip2-1.0.8-h4777abc_8.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/c-ares-1.34.5-h86ecc28_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/c-compiler-1.11.0-hdceaead_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/castxml-0.7.0-ha3e84ed_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/ccache-4.13.6-h185addb_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/cmake-4.1.2-hc9d863e_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/conda-gcc-specs-14.3.0-h92dcf8a_7.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/cxx-compiler-1.11.0-h7b35c40_0.conda
@@ -1670,11 +1684,13 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/gxx-14.3.0-ha28f942_7.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/gxx_impl_linux-aarch64-14.3.0-h72695c8_7.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/gxx_linux-aarch64-14.3.0-hda493e9_12.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/icu-78.3-hcab7f73_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/keyutils-1.6.3-h86ecc28_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/krb5-1.21.3-h50a48e9_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/ld_impl_linux-aarch64-2.44-hd32f0e1_4.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/libblas-3.9.0-38_haddc8a3_openblas.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/libcblas-3.9.0-38_hd72aa62_openblas.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/libclang-cpp20.1-20.1.8-default_he95a3c9_16.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/libcurl-8.16.0-h7bfdcfb_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/libedit-3.1.20250104-pl5321h976ea20_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/libev-4.33-h31becfc_2.conda
@@ -1685,7 +1701,10 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/libgfortran-15.2.0-he9431aa_7.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/libgfortran5-15.2.0-h87db57e_7.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/libgomp-15.2.0-he277a41_7.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/libhiredis-1.3.0-h5ad3122_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/libiconv-1.18-h90929bb_2.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/liblapack-3.9.0-38_h88aeb00_openblas.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/libllvm20-20.1.8-hfd2ba90_1.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/liblzma-5.8.1-h86ecc28_2.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/libmpdec-4.0.0-h86ecc28_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/libnghttp2-1.67.0-ha888d0e_0.conda
@@ -1697,15 +1716,20 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/libstdcxx-ng-15.2.0-hf1166c9_7.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/libuuid-2.41.2-h3e4203c_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/libuv-1.51.0-he30d5cf_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/libxml2-16-2.15.1-h79dcc73_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/libxml2-2.15.1-h825857f_1.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/libzlib-1.3.1-h86ecc28_2.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/ncurses-6.5-ha32ae93_3.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/ninja-1.13.1-hdc560ac_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/numpy-2.3.4-py313h11e5ff7_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/openssl-3.5.4-h8e36d6e_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/pcre2-10.47-hf841c20_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/python-3.13.9-h4c0d347_101_cp313.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/readline-8.2-h8382b9d_2.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/rhash-1.4.6-h86ecc28_1.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/swig-4.4.1-h512d76c_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/tk-8.6.13-noxft_h5688188_102.conda
+      - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/xxhash-0.8.3-hd794028_0.conda
       - conda: https://conda.anaconda.org/conda-forge/linux-aarch64/zstd-1.5.7-hbcf94c1_2.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/ca-certificates-2025.10.5-hbd8a1cb_0.conda
       - conda: https://conda.anaconda.org/conda-forge/noarch/colorama-0.4.6-pyhd8ed1ab_1.conda
@@ -1740,6 +1764,8 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/osx-64/bzip2-1.0.8-h500dc9f_8.conda
       - conda: https://conda.anaconda.org/conda-forge/osx-64/c-ares-1.34.5-hf13058a_0.conda
       - conda: https://conda.anaconda.org/conda-forge/osx-64/c-compiler-1.11.0-h7a00415_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/osx-64/castxml-0.7.0-hb171174_0.conda
+      - conda: https://conda.anaconda.org/conda-forge/osx-64/ccache-4.13.6-h894318c_0.conda
       - conda: https://conda.anaconda.org/conda-forge/osx-64/cctools-1024.3-h67a6458_9.conda
       - conda: https://conda.anaconda.org/conda-forge/osx-64/cctools_osx-64-1024.3-llvm19_1_h3b512aa_9.conda
       - conda: https://conda.anaconda.org/conda-forge/osx-64/clang-19-19.1.7-default_hc369343_5.conda
@@ -1758,6 +1784,7 @@ environments:
       - conda: https://conda.anaconda.org/conda-forge/osx-64/libblas-3.9.0-38_he492b99_openblas.conda
       - conda: https://conda.anaconda.org/conda-forge/osx-64/libcblas-3.9.0-38_h9b27e0a_openblas.conda
       - conda: https://conda.anaconda.org/conda-forge/osx-64/libclang-cpp19.1-19.1.7-default_hc369343_5.conda
+      - conda: https://conda.anaconda.org/conda-forge/osx-64/libclang-cpp20.1-20.1.8-default_h9399c5b_16.conda
       - conda: https://conda.anaconda.org/conda-forge/osx-64/libcurl-8.16.0-h7dd4100_0.conda
       - conda: https://conda.anaconda.org/conda-forge/osx-64/libcxx-21.1.4-h3d58e20_2.conda
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+  timestamp: 1773252068990
 - conda: https://conda.anaconda.org/conda-forge/osx-arm64/tapi-1300.6.5-h03f4b80_0.conda
   sha256: 37cd4f62ec023df8a6c6f9f6ffddde3d6620a83cbcab170a8fff31ef944402e5
   md5: b703bc3e6cba5943acf0e5f987b5d0e2
@@ -10532,6 +10933,9 @@ packages:
   - __osx >=11.0
   license: BSD-2-Clause
   license_family: BSD
+  run_exports:
+    weak:
+    - xxhash >=0.8.3,<0.8.4.0a0
   size: 98913
   timestamp: 1746457827085
 - conda: https://conda.anaconda.org/conda-forge/osx-arm64/yaml-0.2.5-h925e9cb_3.conda
@@ -10661,6 +11065,19 @@ packages:
   license: LGPL-2.1-only or MPL-1.1
   size: 1537783
   timestamp: 1766416059188
+- conda: https://conda.anaconda.org/conda-forge/win-64/castxml-0.7.0-ha22e26b_0.conda
+  sha256: 18602218a9a045c2798c449fa3afa1625960abdc7091a8680eba086e59d5375c
+  md5: 444b03cc1fd97f111454a99f92a23e01
+  depends:
+  - vc >=14.3,<15
+  - vc14_runtime >=14.44.35208
+  - ucrt >=10.0.20348.0
+  - libzlib >=1.3.1,<2.0a0
+  license: Apache-2.0
+  license_family: APACHE
+  run_exports: {}
+  size: 32530472
+  timestamp: 1772089442701
 - conda: https://conda.anaconda.org/conda-forge/win-64/ccache-4.13.6-h7fd822b_0.conda
   sha256: e3363b5ee179a2b369421f69e8879203a958d4efb5cb8c1c52f6b462c1197df7
   md5: d9a4b1ce7d3d948ebe662ea7adf79219
@@ -10674,6 +11091,7 @@ packages:
   - xxhash >=0.8.3,<0.8.4.0a0
   license: GPL-3.0-only
   license_family: GPL
+  run_exports: {}
   size: 692199
   timestamp: 1777926529520
 - conda: https://conda.anaconda.org/conda-forge/win-64/cffi-2.0.0-py313h5ea7bf4_1.conda
@@ -11156,6 +11574,9 @@ packages:
   - vc14_runtime >=14.29.30139
   license: BSD-3-Clause
   license_family: BSD
+  run_exports:
+    weak:
+    - libhiredis >=1.3.0,<1.4.0a0
   size: 64205
   timestamp: 1748219812303
 - conda: https://conda.anaconda.org/conda-forge/win-64/libhwloc-2.12.1-default_h64bd3f2_1002.conda
@@ -11616,6 +12037,9 @@ packages:
   - vc14_runtime >=14.44.35208
   license: BSD-3-Clause
   license_family: BSD
+  run_exports:
+    weak:
+    - pcre2 >=10.47,<10.48.0a0
   size: 995992
   timestamp: 1763655708300
 - conda: https://conda.anaconda.org/conda-forge/win-64/perl-5.32.1.1-7_h57928b3_strawberry.conda
@@ -11710,6 +12134,21 @@ packages:
   license_family: MIT
   size: 182043
   timestamp: 1758892011955
+- conda: https://conda.anaconda.org/conda-forge/win-64/swig-4.4.1-h9b0202b_0.conda
+  sha256: f05e256f8edd14786c7832288e842f313b244a506975c2830ea9bbe7d4abc205
+  md5: 0341bd38d90eae2041629f9084bb143a
+  depends:
+  - vc >=14.3,<15
+  - vc14_runtime >=14.44.35208
+  - ucrt >=10.0.20348.0
+  - pcre2 >=10.47,<10.48.0a0
+  constrains:
+  - swig-abi ==5
+  license: GPL-3.0-or-later
+  license_family: GPL
+  run_exports: {}
+  size: 1154778
+  timestamp: 1773251909868
 - conda: https://conda.anaconda.org/conda-forge/win-64/tbb-2022.3.0-hd094cb3_0.conda
   sha256: 290b1ae188d614d7e1fb98dc04b8afd9762dd82d3a0e2de2a8616c750de7cfab
   md5: d21952ac3d528fa8ca2f268f262f9ec6
@@ -12002,6 +12441,9 @@ packages:
   - vc14_runtime >=14.29.30139
   license: BSD-2-Clause
   license_family: BSD
+  run_exports:
+    weak:
+    - xxhash >=0.8.3,<0.8.4.0a0
   size: 105768
   timestamp: 1746458183583
 - conda: https://conda.anaconda.org/conda-forge/win-64/yaml-0.2.5-h6a83c73_3.conda
diff --git a/pyproject.toml b/pyproject.toml
index a15907900d5..eed4ffac26a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -37,6 +37,9 @@ pytest = ">=8.4.1,<9"
 numpy = ">=2.3.4,<3"
 libopenblas = ">=0.3.30,<0.4"
 libgfortran5 = ">=15.2.0,<16"
+swig = ">=4.4.1"
+castxml = ">=0.7.0,<0.8"
+ccache = ">=4.13.6,<5"
 
 [tool.pixi.feature.cxx.tasks.configure]
 cmd = '''cmake \
@@ -230,6 +233,8 @@ cmd = '''cmake \
   -S. \
   -GNinja \
   -DITK_WRAP_PYTHON:BOOL=ON \
+  -DITK_USE_SYSTEM_SWIG:BOOL=ON \
+  -DITK_USE_SYSTEM_CASTXML:BOOL=ON \
   -DCMAKE_BUILD_TYPE:STRING=Release \
   -DBUILD_TESTING:BOOL=ON'''
 description = "Configure ITK Python"
@@ -258,6 +263,8 @@ cmd = '''cmake \
   -S. \
   -GNinja \
   -DITK_WRAP_PYTHON:BOOL=ON \
+  -DITK_USE_SYSTEM_SWIG:BOOL=ON \
+  -DITK_USE_SYSTEM_CASTXML:BOOL=ON \
   -DCMAKE_BUILD_TYPE:STRING=Debug \
   -DBUILD_TESTING:BOOL=ON'''
 description = "Configure ITK Python - Debug"

From 0353d7e3d3be5972eda85432c32df91cbb10676b Mon Sep 17 00:00:00 2001
From: "Hans J. Johnson" <hans-johnson@uiowa.edu>
Date: Sat, 20 Jun 2026 12:07:06 -0500
Subject: [PATCH 3/4] COMP: Add ITK.Pixi.Python CI exercising SWIG 4.4.1 Python
 wrapping

New workflow builds the Python wrapping with system SWIG 4.4.1 + CastXML on
ubuntu/windows/macos, runs an import + filter + std::vector smoke test, and a
scoped set of Python regression tests.
---
 .github/workflows/pixi-python.yml | 139 ++++++++++++++++++++++++++++++
 1 file changed, 139 insertions(+)
 create mode 100644 .github/workflows/pixi-python.yml

diff --git a/.github/workflows/pixi-python.yml b/.github/workflows/pixi-python.yml
new file mode 100644
index 00000000000..f50c4e4b83c
--- /dev/null
+++ b/.github/workflows/pixi-python.yml
@@ -0,0 +1,139 @@
+name: ITK.Pixi.Python
+
+on:
+    workflow_dispatch:
+    push:
+        branches:
+            - main
+            - 'release*'
+        paths-ignore:
+            - '*.md'
+            - LICENSE
+            - NOTICE
+            - 'Documentation/**'
+            - 'Utilities/Debugger/**'
+            - 'Utilities/ITKv5Preparation/**'
+            - 'Utilities/Maintenance/**'
+            - 'Modules/Remote/*.remote.cmake'
+    pull_request:
+        paths-ignore:
+            - '*.md'
+            - LICENSE
+            - NOTICE
+            - 'Documentation/**'
+            - 'Utilities/Debugger/**'
+            - 'Utilities/ITKv5Preparation/**'
+            - 'Utilities/Maintenance/**'
+            - 'Modules/Remote/*.remote.cmake'
+
+concurrency:
+  group: '${{ github.workflow }}@${{ github.head_ref || github.ref }}'
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
+jobs:
+    Pixi-Python:
+      runs-on: ${{ matrix.os }}
+      timeout-minutes: 0
+      strategy:
+        fail-fast: false
+        matrix:
+          os: [ubuntu-22.04, windows-2022, macos-15]
+      steps:
+        - name: Checkout
+          uses: actions/checkout@v5
+          with:
+            fetch-depth: 5
+            clean: true
+
+        - name: Configure ccache environment
+          shell: bash
+          run: |
+            echo "CCACHE_BASEDIR=${GITHUB_WORKSPACE}" >> "$GITHUB_ENV"
+            echo "CCACHE_COMPILERCHECK=content" >> "$GITHUB_ENV"
+            echo "CCACHE_NOHASHDIR=true" >> "$GITHUB_ENV"
+            echo "CCACHE_SLOPPINESS=pch_defines,time_macros" >> "$GITHUB_ENV"
+            echo "CCACHE_DIR=${{ runner.temp }}/ccache" >> "$GITHUB_ENV"
+            echo "CCACHE_MAXSIZE=5G" >> "$GITHUB_ENV"
+            # configure-python has no ccache launcher of its own; CMake initializes
+            # CMAKE_<LANG>_COMPILER_LAUNCHER from these environment variables.
+            echo "CMAKE_C_COMPILER_LAUNCHER=ccache" >> "$GITHUB_ENV"
+            echo "CMAKE_CXX_COMPILER_LAUNCHER=ccache" >> "$GITHUB_ENV"
+            if [ "$RUNNER_OS" == "Linux" ]; then
+              sudo apt-get update -qq && sudo apt-get install -y locales
+              sudo locale-gen de_DE.UTF-8
+            fi
+
+        - name: Restore compiler cache
+          uses: actions/cache/restore@v5
+          with:
+            path: ${{ runner.temp }}/ccache
+            key: ccache-v4-${{ runner.os }}-pixi-python-${{ github.sha }}
+            restore-keys: |
+              ccache-v4-${{ runner.os }}-pixi-python-
+
+        - name: Disk space reporting BEFORE
+          shell: bash
+          run: df -h /
+
+        - name: Free Disk Space (Ubuntu)
+          if: matrix.os == 'ubuntu-22.04'
+          uses: BRAINSia/free-disk-space@v2
+          with:
+            removalmode: "rmz"
+            swap-storage:   "true"
+            haskell:        "true"
+            dotnet:         "true"
+            docker-images:  "false"
+            tool-cache:     "true"
+            android:        "false"
+            large-packages: "true"
+            mandb:          "true"
+
+        - name: Set up Pixi
+          uses: prefix-dev/setup-pixi@v0.9.5
+
+        - name: ccache stats (zero)
+          shell: bash
+          run: pixi run -e python ccache --zero-stats
+
+        - name: Build Python wrapping (system SWIG 4.4.1 + CastXML)
+          shell: bash
+          run: |
+            df -h /
+            pixi run build-python
+            df -h /
+
+        - name: Import smoke test
+          shell: bash
+          run: |
+            # The build tree's itk package is on the path via WrapITK.pth; expose its
+            # directory on PYTHONPATH (pixi run preserves the exported variable).
+            export PYTHONPATH="${GITHUB_WORKSPACE}/build-python/Wrapping/Generators/Python"
+            pixi run -e python python -c "
+            import itk, numpy as np
+            print('ITK', itk.Version.GetITKVersion())
+            img = itk.image_from_array(np.zeros((16, 16), dtype=np.float32))
+            out = itk.median_image_filter(img, radius=2)
+            assert list(itk.size(out)) == [16, 16]
+            v = itk.vector[itk.D]([1.0, 2.0, 3.0])  # std::vector / SwigPyIterator path
+            assert len(v) == 3 and v[0] == 1.0
+            print('SWIG 4.4.1 Python wrapping import + filter + vector OK')
+            "
+
+        - name: Scoped Python regression tests
+          shell: bash
+          run: |
+            pixi run -e python ctest --test-dir build-python --output-on-failure \
+              -R "PythonSimplePipeline|PythonTemplatedPipeline|PythonLazyLoading|NonBlockingPythonFilterCoverage|PythonExtrasTest"
+
+        - name: ccache stats
+          if: always()
+          shell: bash
+          run: pixi run -e python ccache --show-stats
+
+        - name: Save compiler cache
+          if: ${{ !cancelled() }}
+          uses: actions/cache/save@v5
+          with:
+            path: ${{ runner.temp }}/ccache
+            key: ccache-v4-${{ runner.os }}-pixi-python-${{ github.sha }}

From f3a0ca1568f123fb8ebb24a673ddb7d1a9ddb06e Mon Sep 17 00:00:00 2001
From: "Hans J. Johnson" <hans-johnson@uiowa.edu>
Date: Sat, 20 Jun 2026 12:07:09 -0500
Subject: [PATCH 4/4] COMP: WIP co-opt ITK.Pixi CI for SWIG 4.4.1 Python
 wrapping

TEMPORARY scaffolding to iterate on the SWIG 4.4.1 Python wrapping:
- Co-opts the reliably-triggering ITK.Pixi workflow (pixi.yml) to run the
  Python wrapping via configure-python-ci / build-python-ci / test-python-ci
  (system SWIG/CastXML + ccache in the python env) instead of the cxx env.
- Neuters the PR triggers of the remaining build/check CI (arm, doxygen,
  perf-benchmark, pre-commit GHA set to workflow_dispatch; Azure
  Linux/LinuxPython/MacOSPython/WindowsPython set pr: none).
REVERT THIS COMMIT before merge to restore the normal cxx ITK.Pixi CI and
re-enable all other CI.
---
 .github/workflows/arm.yml                     | 26 ++------------
 .github/workflows/doxygen.yml                 | 17 ++-------
 .github/workflows/perf-benchmark.yml          | 11 +-----
 .github/workflows/pixi.yml                    | 35 ++++++++++---------
 .github/workflows/pre-commit.yml              |  4 +--
 .../AzurePipelinesLinux.yml                   | 15 ++------
 .../AzurePipelinesLinuxPython.yml             | 15 ++------
 .../AzurePipelinesMacOSPython.yml             | 15 ++------
 .../AzurePipelinesWindowsPython.yml           | 15 ++------
 pyproject.toml                                | 28 +++++++++++++++
 10 files changed, 62 insertions(+), 119 deletions(-)

diff --git a/.github/workflows/arm.yml b/.github/workflows/arm.yml
index 5fa97d3b5e3..a0076b16e78 100644
--- a/.github/workflows/arm.yml
+++ b/.github/workflows/arm.yml
@@ -1,30 +1,8 @@
 name: ITK.Arm64
 
+# WIP(SWIG-4.4.1 pixi-python): disabled so only ITK.Pixi.Python runs; revert this commit to re-enable
 on:
-    push:
-        branches:
-            - main
-            - 'release*'
-        paths-ignore:
-            - '*.md'
-            - LICENSE
-            - NOTICE
-            - 'Documentation/**'
-            - 'Utilities/Debugger/**'
-            - 'Utilities/ITKv5Preparation/**'
-            - 'Utilities/Maintenance/**'
-            - 'Modules/Remote/*.remote.cmake'
-    pull_request:
-        paths-ignore:
-            - '*.md'
-            - LICENSE
-            - NOTICE
-            - 'Documentation/**'
-            - 'Utilities/Debugger/**'
-            - 'Utilities/ITKv5Preparation/**'
-            - 'Utilities/Maintenance/**'
-            - 'Modules/Remote/*.remote.cmake'
-
+  workflow_dispatch:
 concurrency:
   group: '${{ github.workflow }}@${{ github.head_ref || github.ref }}'
   cancel-in-progress: ${{ github.event_name == 'pull_request' }}
diff --git a/.github/workflows/doxygen.yml b/.github/workflows/doxygen.yml
index 9fbcdacd0b4..7e8e23b4db7 100644
--- a/.github/workflows/doxygen.yml
+++ b/.github/workflows/doxygen.yml
@@ -2,22 +2,9 @@ name: ITK.Doxygen.Warnings
 
 # pull_request intentionally has no paths-ignore: the check always runs, so it
 # can safely be made a required status without stranding filtered PRs.
+# WIP(SWIG-4.4.1 pixi-python): disabled so only ITK.Pixi.Python runs; revert this commit to re-enable
 on:
-    push:
-        branches:
-            - main
-            - 'release*'
-        tags:
-            - 'v*'
-        paths-ignore:
-            - '*.md'
-            - LICENSE
-            - NOTICE
-            - 'Utilities/Debugger/**'
-            - 'Utilities/ITKv5Preparation/**'
-            - 'Utilities/Maintenance/**'
-    pull_request:
-
+  workflow_dispatch:
 concurrency:
   group: '${{ github.workflow }}@${{ github.head_ref || github.ref }}'
   cancel-in-progress: ${{ github.event_name == 'pull_request' }}
diff --git a/.github/workflows/perf-benchmark.yml b/.github/workflows/perf-benchmark.yml
index 6ecd1e745d6..f49e5ce434e 100644
--- a/.github/workflows/perf-benchmark.yml
+++ b/.github/workflows/perf-benchmark.yml
@@ -1,17 +1,8 @@
 name: ITK.Performance
 
+# WIP(SWIG-4.4.1 pixi-python): disabled so only ITK.Pixi.Python runs; revert this commit to re-enable
 on:
-  pull_request:
-    paths-ignore:
-      - '*.md'
-      - LICENSE
-      - NOTICE
-      - 'Documentation/**'
-      - 'Utilities/Debugger/**'
-      - 'Utilities/ITKv5Preparation/**'
-      - 'Utilities/Maintenance/**'
   workflow_dispatch:
-
 concurrency:
   group: '${{ github.workflow }}@${{ github.head_ref || github.ref }}'
   cancel-in-progress: ${{ github.event_name == 'pull_request' }}
diff --git a/.github/workflows/pixi.yml b/.github/workflows/pixi.yml
index 7e9798e10ff..0a906b64833 100644
--- a/.github/workflows/pixi.yml
+++ b/.github/workflows/pixi.yml
@@ -1,6 +1,10 @@
 name: ITK.Pixi
 
+# WIP(SWIG-4.4.1 pixi-python): temporarily co-opted to build/test the Python
+# wrapping (configure/build/test-python-ci) instead of the cxx env. Revert this
+# commit to restore the normal cxx CI.
 on:
+    workflow_dispatch:
     push:
         branches:
             - main
@@ -24,7 +28,6 @@ on:
             - 'Utilities/ITKv5Preparation/**'
             - 'Utilities/Maintenance/**'
             - 'Modules/Remote/*.remote.cmake'
-
 concurrency:
   group: '${{ github.workflow }}@${{ github.head_ref || github.ref }}'
   cancel-in-progress: ${{ github.event_name == 'pull_request' }}
@@ -64,9 +67,9 @@ jobs:
           uses: actions/cache/restore@v5
           with:
             path: ${{ runner.temp }}/ccache
-            key: ccache-v4-${{ runner.os }}-pixi-cxx-${{ github.sha }}
+            key: ccache-v4-${{ runner.os }}-pixi-python-${{ github.sha }}
             restore-keys: |
-              ccache-v4-${{ runner.os }}-pixi-cxx-
+              ccache-v4-${{ runner.os }}-pixi-python-
 
         - name: Restore ExternalData object store
           id: restore-externaldata
@@ -127,21 +130,21 @@ jobs:
         - name: Show ccache configuration, stats and maintenance
           shell: bash
           run: |
-            pixi run -e cxx ccache --zero-stats
-            pixi run -e cxx ccache --evict-older-than 7d
-            pixi run -e cxx ccache --show-config
+            pixi run -e python ccache --zero-stats
+            pixi run -e python ccache --evict-older-than 7d
+            pixi run -e python ccache --show-config
 
         - name: Configure
-          run: pixi run configure-ci
+          run: pixi run configure-python-ci
 
         - name: Fetch ExternalData
-          run: pixi run --skip-deps build-external-data-ci
+          run: pixi run -e python cmake --build build-python --target ITKData
 
         - name: Build
           run: |
             echo "****** df -h /  -- pre build"
             df -h /
-            pixi run --skip-deps build-ci
+            pixi run --skip-deps build-python-ci
             echo "****** df -h /  -- post build"
             df -h /
 
@@ -152,16 +155,16 @@ jobs:
             # .obj/.lib also name Wavefront-mesh and Makefile test data, so match
             # only compiled objects in intermediate dirs (CMakeFiles/ for Ninja,
             # *.dir/ for Visual Studio) and archives under lib/.
-            find build -type f \( -path '*/CMakeFiles/*' -o -path '*.dir/*' \) \( -name "*.o" -o -name "*.obj" \) -delete
-            find build/lib -type f \( -name "*.a" -o -name "*.lib" \) -delete 2>/dev/null || true
+            find build-python -type f \( -path '*/CMakeFiles/*' -o -path '*.dir/*' \) \( -name "*.o" -o -name "*.obj" \) -delete
+            find build-python/lib -type f \( -name "*.a" -o -name "*.lib" \) -delete 2>/dev/null || true
             # Trim ccache to stay within CCACHE_MAXSIZE and remove orphaned entries
-            pixi run -e cxx ccache --evict-older-than 1d 2>/dev/null || true
-            pixi run -e cxx ccache --cleanup 2>/dev/null || true
+            pixi run -e python ccache --evict-older-than 1d 2>/dev/null || true
+            pixi run -e python ccache --cleanup 2>/dev/null || true
             echo "****** df -h /  -- post cleanup"
             df -h /
 
         - name: Test
-          run: pixi run --skip-deps test-ci
+          run: pixi run --skip-deps test-python-ci
 
         - name: Disk space reporting AFTER (optimize free-disk-space)
           run: |
@@ -176,7 +179,7 @@ jobs:
           uses: actions/cache/save@v5
           with:
             path: ${{ runner.temp }}/ccache
-            key: ccache-v4-${{ runner.os }}-pixi-cxx-${{ github.sha }}
+            key: ccache-v4-${{ runner.os }}-pixi-python-${{ github.sha }}
 
         # ExternalData object store is populated by
         # .github/workflows/populate-externaldata-cache.yml — a dedicated
@@ -188,7 +191,7 @@ jobs:
 
         - name: ccache stats
           if: always()
-          run: pixi run -e cxx ccache --show-stats
+          run: pixi run -e python ccache --show-stats
 
     prune-superseded-caches:
       # Background housekeeping: removes ccache entries whose SHA-suffixed
diff --git a/.github/workflows/pre-commit.yml b/.github/workflows/pre-commit.yml
index dabebc4a162..903862d802d 100644
--- a/.github/workflows/pre-commit.yml
+++ b/.github/workflows/pre-commit.yml
@@ -1,8 +1,8 @@
 name: pre-commit
 
+# WIP(SWIG-4.4.1 pixi-python): disabled so only ITK.Pixi.Python runs; revert this commit to re-enable
 on:
-  pull_request:
-
+  workflow_dispatch:
 jobs:
   pre-commit:
     runs-on: ubuntu-24.04
diff --git a/Testing/ContinuousIntegration/AzurePipelinesLinux.yml b/Testing/ContinuousIntegration/AzurePipelinesLinux.yml
index 90a1419ae9a..8f3c7ec3aea 100644
--- a/Testing/ContinuousIntegration/AzurePipelinesLinux.yml
+++ b/Testing/ContinuousIntegration/AzurePipelinesLinux.yml
@@ -15,19 +15,8 @@ trigger:
     - Utilities/ITKv5Preparation/*
     - Utilities/Maintenance/*
     - Modules/Remote/*.remote.cmake
-pr:
-  # Validate draft PRs (Azure default) so contributors see all gating results while iterating.
-  drafts: true
-  paths:
-    exclude:
-    - '*.md'
-    - LICENSE
-    - NOTICE
-    - Documentation/*
-    - Utilities/Debugger/*
-    - Utilities/ITKv5Preparation/*
-    - Utilities/Maintenance/*
-    - Modules/Remote/*.remote.cmake
+# WIP(SWIG-4.4.1 pixi-python): co-opting ITK.Pixi for the Python build; revert this commit to re-enable.
+pr: none
 variables:
   ExternalData_OBJECT_STORES: $(Pipeline.Workspace)/ExternalData
   CCACHE_DIR: $(Pipeline.Workspace)/.ccache
diff --git a/Testing/ContinuousIntegration/AzurePipelinesLinuxPython.yml b/Testing/ContinuousIntegration/AzurePipelinesLinuxPython.yml
index b1c42b92c77..f527a45bb5f 100644
--- a/Testing/ContinuousIntegration/AzurePipelinesLinuxPython.yml
+++ b/Testing/ContinuousIntegration/AzurePipelinesLinuxPython.yml
@@ -15,19 +15,8 @@ trigger:
     - Utilities/ITKv5Preparation/*
     - Utilities/Maintenance/*
     - Modules/Remote/*.remote.cmake
-pr:
-  # Validate draft PRs (Azure default) so contributors see all gating results while iterating.
-  drafts: true
-  paths:
-    exclude:
-    - '*.md'
-    - LICENSE
-    - NOTICE
-    - Documentation/*
-    - Utilities/Debugger/*
-    - Utilities/ITKv5Preparation/*
-    - Utilities/Maintenance/*
-    - Modules/Remote/*.remote.cmake
+# WIP(SWIG-4.4.1 pixi-python): co-opting ITK.Pixi for the Python build; revert this commit to re-enable.
+pr: none
 variables:
   ExternalData_OBJECT_STORES: $(Pipeline.Workspace)/ExternalData
   CCACHE_DIR: $(Pipeline.Workspace)/.ccache
diff --git a/Testing/ContinuousIntegration/AzurePipelinesMacOSPython.yml b/Testing/ContinuousIntegration/AzurePipelinesMacOSPython.yml
index 898ba9743cf..15094373f1b 100644
--- a/Testing/ContinuousIntegration/AzurePipelinesMacOSPython.yml
+++ b/Testing/ContinuousIntegration/AzurePipelinesMacOSPython.yml
@@ -15,19 +15,8 @@ trigger:
     - Utilities/ITKv5Preparation/*
     - Utilities/Maintenance/*
     - Modules/Remote/*.remote.cmake
-pr:
-  # Validate draft PRs (Azure default) so contributors see all gating results while iterating.
-  drafts: true
-  paths:
-    exclude:
-    - '*.md'
-    - LICENSE
-    - NOTICE
-    - Documentation/*
-    - Utilities/Debugger/*
-    - Utilities/ITKv5Preparation/*
-    - Utilities/Maintenance/*
-    - Modules/Remote/*.remote.cmake
+# WIP(SWIG-4.4.1 pixi-python): co-opting ITK.Pixi for the Python build; revert this commit to re-enable.
+pr: none
 variables:
   ExternalData_OBJECT_STORES: $(Pipeline.Workspace)/ExternalData
   CCACHE_DIR: $(Pipeline.Workspace)/.ccache
diff --git a/Testing/ContinuousIntegration/AzurePipelinesWindowsPython.yml b/Testing/ContinuousIntegration/AzurePipelinesWindowsPython.yml
index 3e834a7dfda..7bd448a2dd5 100644
--- a/Testing/ContinuousIntegration/AzurePipelinesWindowsPython.yml
+++ b/Testing/ContinuousIntegration/AzurePipelinesWindowsPython.yml
@@ -15,19 +15,8 @@ trigger:
     - Utilities/ITKv5Preparation/*
     - Utilities/Maintenance/*
     - Modules/Remote/*.remote.cmake
-pr:
-  # Validate draft PRs (Azure default) so contributors see all gating results while iterating.
-  drafts: true
-  paths:
-    exclude:
-    - '*.md'
-    - LICENSE
-    - NOTICE
-    - Documentation/*
-    - Utilities/Debugger/*
-    - Utilities/ITKv5Preparation/*
-    - Utilities/Maintenance/*
-    - Modules/Remote/*.remote.cmake
+# WIP(SWIG-4.4.1 pixi-python): co-opting ITK.Pixi for the Python build; revert this commit to re-enable.
+pr: none
 variables:
   ExternalData_OBJECT_STORES: $(Pipeline.Workspace)/ExternalData
   CCACHE_DIR: $(Pipeline.Workspace)/.ccache
diff --git a/pyproject.toml b/pyproject.toml
index eed4ffac26a..77533bc28ea 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -240,6 +240,34 @@ cmd = '''cmake \
 description = "Configure ITK Python"
 outputs = ["build-python/CMakeFiles/"]
 
+[tool.pixi.feature.python.tasks.configure-python-ci]
+cmd = '''cmake \
+  -Bbuild-python \
+  -S. \
+  -GNinja \
+  -DITK_WRAP_PYTHON:BOOL=ON \
+  -DITK_USE_SYSTEM_SWIG:BOOL=ON \
+  -DITK_USE_SYSTEM_CASTXML:BOOL=ON \
+  -DCMAKE_BUILD_TYPE:STRING=Release \
+  -DBUILD_TESTING:BOOL=ON \
+  -DITK_USE_CCACHE:BOOL=ON \
+  -DCMAKE_C_COMPILER_LAUNCHER:STRING=ccache \
+  -DCMAKE_CXX_COMPILER_LAUNCHER:STRING=ccache \
+  -DITK_COMPUTER_MEMORY_SIZE:STRING=5'''
+description = "Configure ITK Python wrapping for CI (system SWIG/CastXML + ccache)"
+outputs = ["build-python/CMakeFiles/"]
+
+[tool.pixi.feature.python.tasks.build-python-ci]
+cmd = "cmake --build build-python"
+description = "Build ITK Python wrapping for CI"
+outputs = ["build-python/lib/**"]
+depends-on = ["configure-python-ci"]
+
+[tool.pixi.feature.python.tasks.test-python-ci]
+cmd = "ctest -j3 --test-dir build-python --output-on-failure -R Python"
+description = "Test ITK Python wrapping for CI"
+depends-on = ["build-python-ci"]
+
 [tool.pixi.feature.python.tasks.build-python]
 cmd = "cmake --build build-python"
 description = "Build ITK Python"