OpenGL导入pyqtgraph失败

Question

我有一个安装了Python3、pyopengl和pyqtgraph的conda环境。运行import OpenGL没有任何问题，但是当我尝试运行带有python -m pyqtgraph.examples的pyqtgraph示例时，大多数示例都可以运行，但是如果我运行一个需要OpenGL的3D示例，我会得到以下错误：

Using PyQt5 (default graphics system)
Traceback (most recent call last):
  File "/usr/local/Caskroom/miniconda/base/envs/mcdermott3/lib/python3.8/site-packages/OpenGL/platform/darwin.py", line 35, in GL
    return ctypesloader.loadLibrary(
  File "/usr/local/Caskroom/miniconda/base/envs/mcdermott3/lib/python3.8/site-packages/OpenGL/platform/ctypesloader.py", line 45, in loadLibrary
    return dllType( name, mode )
  File "/usr/local/Caskroom/miniconda/base/envs/mcdermott3/lib/python3.8/ctypes/__init__.py", line 381, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: ('dlopen(OpenGL, 10): image not found', 'OpenGL', None)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/Caskroom/miniconda/base/envs/mcdermott3/lib/python3.8/site-packages/pyqtgraph/examples/GLIsosurface.py", line 12, in <module>
    import pyqtgraph.opengl as gl
  File "/usr/local/Caskroom/miniconda/base/envs/mcdermott3/lib/python3.8/site-packages/pyqtgraph/opengl/__init__.py", line 1, in <module>
    from .GLViewWidget import GLViewWidget
  File "/usr/local/Caskroom/miniconda/base/envs/mcdermott3/lib/python3.8/site-packages/pyqtgraph/opengl/GLViewWidget.py", line 2, in <module>
    from OpenGL.GL import *
  File "/usr/local/Caskroom/miniconda/base/envs/mcdermott3/lib/python3.8/site-packages/OpenGL/GL/__init__.py", line 3, in <module>
    from OpenGL import error as _error
  File "/usr/local/Caskroom/miniconda/base/envs/mcdermott3/lib/python3.8/site-packages/OpenGL/error.py", line 12, in <module>
    from OpenGL import platform, _configflags
  File "/usr/local/Caskroom/miniconda/base/envs/mcdermott3/lib/python3.8/site-packages/OpenGL/platform/__init__.py", line 35, in <module>
    _load()
  File "/usr/local/Caskroom/miniconda/base/envs/mcdermott3/lib/python3.8/site-packages/OpenGL/platform/__init__.py", line 32, in _load
    plugin.install(globals())
  File "/usr/local/Caskroom/miniconda/base/envs/mcdermott3/lib/python3.8/site-packages/OpenGL/platform/baseplatform.py", line 92, in install
    namespace[ name ] = getattr(self,name,None)
  File "/usr/local/Caskroom/miniconda/base/envs/mcdermott3/lib/python3.8/site-packages/OpenGL/platform/baseplatform.py", line 14, in __get__
    value = self.fget( obj )
  File "/usr/local/Caskroom/miniconda/base/envs/mcdermott3/lib/python3.8/site-packages/OpenGL/platform/darwin.py", line 62, in GetCurrentContext
    return self.CGL.CGLGetCurrentContext 
  File "/usr/local/Caskroom/miniconda/base/envs/mcdermott3/lib/python3.8/site-packages/OpenGL/platform/baseplatform.py", line 14, in __get__
    value = self.fget( obj )
  File "/usr/local/Caskroom/miniconda/base/envs/mcdermott3/lib/python3.8/site-packages/OpenGL/platform/darwin.py", line 45, in CGL
    def CGL(self): return self.GL
  File "/usr/local/Caskroom/miniconda/base/envs/mcdermott3/lib/python3.8/site-packages/OpenGL/platform/baseplatform.py", line 14, in __get__
    value = self.fget( obj )
  File "/usr/local/Caskroom/miniconda/base/envs/mcdermott3/lib/python3.8/site-packages/OpenGL/platform/darwin.py", line 41, in GL
    raise ImportError("Unable to load OpenGL library", *err.args)
ImportError: ('Unable to load OpenGL library', 'dlopen(OpenGL, 10): image not found', 'OpenGL', None)

有没有办法解决这个问题？如果它是相关的，我在Mac OS Big Sur上运行它，并用conda安装了所有东西

编辑：我刚刚发现this关于一个类似的问题，但仍然不知道该怎么办

Answer 1

来自Paul McCarthy的电子邮件：

“这可能是由于Big-Sur的变化影响了Python查找共享库的方式，这导致PyOpenGL崩溃，实际上与您发现的FSLeyes github问题无关。Big-Sur现在从文件系统中删除某些共享动态库文件，并将其放入内存缓存中。然后，它拦截引用完整文件路径的dlopen调用，并从缓存加载文件。这与Python以前用于在macOS上加载共享库的方法不兼容。Python人员已经实现了一个解决方案，但我不确定修复程序是否已经发布（我认为它只是针对Python3.8和更高版本发布的）。”

Thislink对此问题有一些修复方法