PyOpenGL problems are easier to solve when you stop treating them as one big error. The Python package, window toolkit, OpenGL context, driver, shaders and render loop can each fail for different reasons. A repeated reinstall rarely fixes a context or drawing problem.
Fix missing OpenGL imports
Check the interpreter used by your terminal and editor. Run python -m pip show PyOpenGL and print sys.executable so you know exactly where the package is installed and which Python is running the script.
Fix null or unavailable functions
Create the context before calling OpenGL functions, then query the active OpenGL version. A function may exist in the Python module but still be unavailable from the current driver or context.
print(sys.executable)
print(OpenGL.__version__)
# Create context, then query GL_VERSION and GL_RENDERER
Read shader errors instead of guessing
Print the complete shader compile and program link logs. Check the GLSL version, input and output names, attribute layout and data types, then test a very small shader pair.
Work through a black window
Set the viewport, choose a visible clear color, confirm the geometry coordinates, bind the expected objects, draw the correct number of vertices and present the frame. Temporarily disable depth testing or culling when they may hide the result.
Improve performance after measuring
Keep static data in GPU buffers, group draw calls, reduce repeated Python object creation and avoid unnecessary state changes. Profile the application first so you do not optimize the wrong part.