Debug | You might be loading two sets of Qt binaries into the same process.

完整的Bug是这样的：

You might be loading two sets of Qt binaries into the same process. Check that all plugins are compiled against the right Qt binaries. Export DYLD_PRINT_LIBRARIES=1 and check that only one set of binaries are being loaded.
qt.qpa.plugin: Could not load the Qt platform plugin “cocoa” in “” even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

这个bug的主要意思就是找不到插件。

排查了一晚上加一上午，最后应该是在装vtk的时候，把pythonpath链接到vtk的库里了，导致QT找不到需要的插件。
解决方法可以是重新设置PYTHONPATH
我的方法是直接把vtk和pyqt都卸载了，然后在anaconda里面装这两个库， 运行程序就在conda的环境下。Run like a charm.