python 3.9 Building wheel for opencv-contrib-python (PEP 517)

问题：

python3.9安装airetest 一直卡在：Building wheel for opencv-contrib-python (PEP 517)。。。

解决办法：

降低opencv-contrib-python版本先安装opencv-contrib-python：

pip install opencv-contrib-python==3.4.11.45

安装成功，在执行安装airtest:

pip install airtest -i https://mirrors.aliyun.com/pypi/simple/

可成功安装，问题解决。