Blender 2.82 doesn't capture numpy path when WITH_PYTHON_INSTALL_NUMPY=OFF #74304

New Issue

veprbl · 2020-02-28T19:53:02+01:00

veprbl commented

2020-02-28 19:53:02 +01:00

System Information
Operating system: Linux, macOS
Graphics card:

Blender Version
Broken: v2.82
Worked: v2.81a

Short description of error
https://developer.blender.org/D6598 causes a regression for WITH_PYTHON_INSTALL_NUMPY=OFF
Downstream bug: https://github.com/NixOS/nixpkgs/issues/81218

Exact steps for others to reproduce the error

Build blender with numpy installation outside of PYTHONHOME and options

DWITH_PYTHON_INSTALL=OFF
DWITH_PYTHON_INSTALL_NUMPY=OFF

Launch blender, go to "Scripting" tab, execute "import numpy"
Observe:

Traceback (most recent call last):
  File "<blender_console>", line 1, in <module>
ModuleNotFoundError: No module named 'numpy'

Workaround

Use blender with --python-use-system-env

OR

Use blender with --python-expr "import sys; sys.path.append("${python3Packages.numpy}/${python.sitePackages}")"

**System Information** Operating system: Linux, macOS Graphics card: **Blender Version** Broken: v2.82 Worked: v2.81a **Short description of error** https://developer.blender.org/D6598 causes a regression for WITH_PYTHON_INSTALL_NUMPY=OFF Downstream bug: https://github.com/NixOS/nixpkgs/issues/81218 **Exact steps for others to reproduce the error** 1) Build blender with numpy installation outside of PYTHONHOME and options - DWITH_PYTHON_INSTALL=OFF - DWITH_PYTHON_INSTALL_NUMPY=OFF 2) Launch blender, go to "Scripting" tab, execute "import numpy" 3) Observe: ``` Traceback (most recent call last): File "<blender_console>", line 1, in <module> ModuleNotFoundError: No module named 'numpy' ``` **Workaround** 1) Use blender with --python-use-system-env OR 2) Use blender with --python-expr "import sys; sys.path.append(\"${python3Packages.numpy}/${python.sitePackages}\")"

veprbl commented

2020-02-28 19:53:02 +01:00

Added subscriber: @veprbl

Ankit Meel commented

2020-02-28 21:33:59 +01:00

Added subscriber: @ankitm

Ankit Meel commented

2020-02-28 21:33:59 +01:00

Changed status from 'Needs Triage' to: 'Archived'

Ankit Meel closed this issue

2020-02-28 21:33:59 +01:00

Ankit Meel self-assigned this 2020-02-28 21:33:59 +01:00

Ankit Meel commented

2020-02-28 21:33:59 +01:00

your workaround 1 is the way to do it.
D6598
https://devtalk.blender.org/t/python-imports-in-2-82-are-not-working/11380/7
https://blender.stackexchange.com/questions/5287/using-3rd-party-python-modules
https://docs.blender.org/manual/en/latest/editors/preferences/file_paths.html?highlight=scripts%20python%20preferences#scripts-path

your workaround 1 is *the* way to do it. [D6598](https://archive.blender.org/developer/D6598) https://devtalk.blender.org/t/python-imports-in-2-82-are-not-working/11380/7 https://blender.stackexchange.com/questions/5287/using-3rd-party-python-modules https://docs.blender.org/manual/en/latest/editors/preferences/file_paths.html?highlight=scripts%20python%20preferences#scripts-path

Ankit Meel commented

2020-02-28 21:35:53 +01:00

Added subscriber: @ideasman42

Ankit Meel commented

2020-02-28 21:35:53 +01:00

poking @ideasman42 in case there's a regression in WITH_PYTHON_INSTALL_NUMPY.

poking @ideasman42 in case there's a regression in `WITH_PYTHON_INSTALL_NUMPY`.

veprbl commented

2020-02-29 19:13:10 +01:00

I guess, the issue is not that blender stopped interpreting PYTHONPATH, but that WITH_PYTHON_INSTALL=OFF keeps blender linked to a specific python library, but WITH_PYTHON_INSTALL_NUMPY doesn't link to a specific installation of numpy. And this is normal in the python world where things are commonly left to the late binding and downstream distributions know how to handle this in a uniform way. But you disable some of the standard late binding mechanisms in https://developer.blender.org/D6598 and leave no suggested way to bind blender and a specific installation of numpy.

Overall, this is non-issue, really. Of course downstream can overcome this with some hacks. I'm only reporting just in case this may be considered a bug. Thank you for looking into this.

I guess, the issue is not that blender stopped interpreting PYTHONPATH, but that WITH_PYTHON_INSTALL=OFF keeps blender linked to a specific python library, but WITH_PYTHON_INSTALL_NUMPY doesn't link to a specific installation of numpy. And this is normal in the python world where things are commonly left to the late binding and downstream distributions know how to handle this in a uniform way. But you disable some of the standard late binding mechanisms in https://developer.blender.org/D6598 and leave no suggested way to bind blender and a specific installation of numpy. Overall, this is non-issue, really. Of course downstream can overcome this with some hacks. I'm only reporting just in case this may be considered a bug. Thank you for looking into this.

veprbl commented

2020-03-14 21:45:39 +01:00

We recently learned that the second workaround is not working well https://github.com/NixOS/nixpkgs/issues/82337

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Blender 2.82 doesn't capture numpy path when WITH_PYTHON_INSTALL_NUMPY=OFF #74304