python3.6安装opencv遇到报错。如下所示：
pip install opencv-python报错。
Please check the install target is valid and see CMake's output for more information. ---------------------------------------- ERROR: Failed building wheel for opencv-pythonFailed to build opencv-pythonERROR: Could not build wheels for opencv-python, which is required to install pyproject.toml-based projects原因是使用pip install opencv-python命令安装的是最新版本，python3.6不支持。所以找一个python3.6支持的版本。如opencv-python==4.3.0.38。
pip install -i https://pypi.douban.com/simple/ pip install opencv-python==4.3.0.38来源地址：https://blog.csdn.net/qq_41821678/article/details/128913990
