Ubuntu下pyqt5使用opencv执行报错:

AttributeError: module 'cv2' has no attribute 'nameWindow'

解决：

pip3 install opencv-contrib-python

sudo apt-get install python3-opencv

附4种pip下opencv安装包

#主要模块
pip3 install opencv-python
#更多模块，包含contrib
pip3 install opencv-contrib-python
#不带GUI功能
pip3 install opencv-python-headless
#不带GUI功能，包含contrib
pip3 install opencv-contrib-python-headless