py-opengl: OpenGL.error.Error: Attempt to retrieve context when no valid context

[krotalias]

Python opengl used to work with freeglut. However, now there is a problem getting the context. Editing

/opt/local/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/OpenGL/platform/ctypesloader.py

and replacing

fullName = util.find_library( name ) for

fullName = "/System/Library/Frameworks/{}.framework/{}".format(name,name)

as discussed here -- ​https://github.com/PixarAnimationStudios/OpenUSD/issues/1372 -- fixes the problem.

The monkeypatch_ctypes approach also works, and one must import it before opengl in any code using pyopengl:

# ​https://github.com/PixarAnimationStudios/OpenUSD/issues/1372

# /opt/local/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/site-packages/OpenGL/platform/ctypesloader.py

def monkeypatch_ctypes():
    import os
    import ctypes.util
    uname = os.uname()
    if uname.sysname == "Darwin" and uname.release >= "20.":
        real_find_library = ctypes.util.find_library
        def find_library(name):
            if name in {"OpenGL", "GLUT"}:  # add more names here if necessary
                return f"/System/Library/Frameworks/{name}.framework/{name}"
            return real_find_library(name)
        ctypes.util.find_library = find_library
    return

monkeypatch_ctypes()

---

The version of the python used is irrelevant. The bug also appears for python 3.13 I tested on macos Catalina and Monterey, because I do not have access to a newer Mac.

Thank you.