完整報錯如下：

objc[22334]: Class QMacAutoReleasePoolTracker is implemented in both /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/PyQt5/Qt/lib/QtCore.framework/Versions/5/QtCore (0x10a5e30f8) and /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/cv2/.dylibs/QtCore (0x114ab7700). One of the two will be used. Which one is undefined.
objc[22334]: Class QT_ROOT_LEVEL_POOL__THESE_OBJECTS_WILL_BE_RELEASED_WHEN_QAPP_GOES_OUT_OF_SCOPE is implemented in both /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/PyQt5/Qt/lib/QtCore.framework/Versions/5/QtCore (0x10a5e3170) and /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/cv2/.dylibs/QtCore (0x114ab7778). One of the two will be used. Which one is undefined.
objc[22334]: Class KeyValueObserver is implemented in both /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/PyQt5/Qt/lib/QtCore.framework/Versions/5/QtCore (0x10a5e3198) and /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/cv2/.dylibs/QtCore (0x114ab77a0). One of the two will be used. Which one is undefined.
objc[22334]: Class RunLoopModeTracker is implemented in both /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/PyQt5/Qt/lib/QtCore.framework/Versions/5/QtCore (0x10a5e31e8) and /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/cv2/.dylibs/QtCore (0x114ab77f0). One of the two will be used. Which one is undefined.
 

報錯原因：

mac版本下安裝的opencv包包含一些qt的標頭檔案與PyQt5衝突了，導致無法正確匯入相應的包。

解決方案

• 刪除原有的opencv（這裡看到有些部落格寫的是使用命令：pip uninstall opencv-contrib-python，但實際上我的pycharm中是沒有安裝opencv-contrib-python的，我安裝的是opencv-python，所以使用刪除命令前，先要看看自己安裝的是什麼opencv）

pip uninstall opencv-python

• 安裝opencv-headless版本：

pip install opencv-contrib-python-headless
 

這樣就可以正常執行opencv和PyQt5了。

參考文章：https://blog.csdn.net/qq_43444349/article/details/106602543