build: Add a python script to test imports during the build

[cedrik-fuoco-adsk]

Add a python script to test imports during the build

Linked issues

n/a

Summarize your change.

Add build-time validation of Python package imports and clarify Python test purposes.

Describe the reason for the change.

When there are issues with package imports (ABI incompatibilities, missing dependencies, etc.), we often find them out at runtime. This change adds test_python_imports.py to detect import failures during the build.

Additionally, renamed test_python.py to test_python_distribution.py to better distinguish between:

• Import testing (validates pip-installed packages)
• Distribution testing (validates relocatability and environment setup)

Describe what you have tested and on which operating system.

MacOS

Add a list of changes, and note any that might need special attention during the review.

If possible, provide screenshots.

[rogernelson]

This is great, thank you!

[bernie-laberge]

Excellent initiative !
Thanks!

[cedrik-fuoco-adsk]

Address the PR comments, but I am stil having issues with OTIO and Windows in debug.

The first issue was avec the debug postfix of OTIO. OTIO uses "d" but python expects "_d". (See AcademySoftwareFoundation/OpenTimelineIO#1173). For now, I fixed (I think) that by manually renaming the files in the python script.

But now I'm having this issue:
error : ImportError: DLL load failed while importing _otio: A dynamic link library (DLL) initialization routine failed.

         Added to PATH for DLL loading: D:\a\OpenRV\OpenRV\_build\RV_DEPS_PYTHON3\install\bin, D:\a\OpenRV\OpenRV\_build\RV_DEPS_PYTHON3\install\DLLs
         ================================================================================
         Testing Python package imports at build time
         Python: 3.11.9 (remotes/pull/1057/merge-dirty:edb9cf1, Jan 13 2026, 21:03:38) [MSC v.1940 64 bit (AMD64)]
         Platform: win32
         Executable: D:\a\OpenRV\OpenRV\_build\RV_DEPS_PYTHON3\install\bin\python_d.exe
         Source: D:\a\OpenRV\OpenRV\src\build\requirements.txt.in
         Skipping: pip, setuptools, wheel
         Python bin directory: D:\a\OpenRV\OpenRV\_build\RV_DEPS_PYTHON3\install\bin
         Python bin is on PATH: Yes
         ================================================================================
         
         Testing numpy                                         (from requirements.txt)... OK
         Testing opentimelineio                                (from requirements.txt)... Fixed OTIO Debug extension: _opentimed.cp311-win_amd64.pyd -> _opentime_d.cp311-win_amd64.pyd
         Fixed OTIO Debug extension: _otiod.cp311-win_amd64.pyd -> _otio_d.cp311-win_amd64.pyd
         FAILED
    33>CUSTOMBUILD : error : ImportError: DLL load failed while importing _otio: A dynamic link library (DLL) initialization routine failed. [D:\a\OpenRV\OpenRV\_build\cmake\dependencies\RV_DEPS_PYTHON3-stage-target.vcxproj]
           Diagnostic info for OpenTimelineIO:
           Site-packages: ['D:\\a\\OpenRV\\OpenRV\\_build\\RV_DEPS_PYTHON3\\install', 'D:\\a\\OpenRV\\OpenRV\\_build\\RV_DEPS_PYTHON3\\install\\Lib\\site-packages']
           Found opentimelineio at: D:\a\OpenRV\OpenRV\_build\RV_DEPS_PYTHON3\install\Lib\site-packages\opentimelineio
           Contents: adapters, algorithms, console, core, exceptions.py, hooks.py, media_linker.py, opentime.py, plugins, schema
           _opentime files: ['_opentimed.cp311-win_amd64.pyd', '_opentime_d.cp311-win_amd64.pyd']
         Testing PyOpenGL                                      (from requirements.txt)... OK
         Testing PyOpenGL_accelerate                           (from requirements.txt)... OK
         Testing certifi                                       (from requirements.txt)... OK
         Testing six                                           (from requirements.txt)... OK
         Testing packaging                                     (from requirements.txt)... OK
         Testing requests                                      (from requirements.txt)... OK
         Testing cryptography                                  (from requirements.txt)... OK
         Testing pydantic                                      (from requirements.txt)... OK
         Testing cryptography.fernet                           (additional import)... OK
         Testing cryptography.hazmat.bindings._rust            (additional import)... OK
         
         ================================================================================
         Results: 11 passed, 1 failed
         ================================================================================

@rogernelson

[cedrik-fuoco-adsk]

Sorry for the bunch of commits since a couple days. It should be all good to review now. @eloisebrosseau @bernie-laberge @rogernelson

[cedrik-fuoco-adsk]

Before merging this PR, I will wait a bit more time for AcademySoftwareFoundation/OpenTimelineIO#1991 to be merged in OTIO. I might merged it sooner if it's taking more time than expected.