Build Qt5 environment
1. Check the installed version of Python
2. Download Qt5 image (use watercress is a mirror image)
pip install PyQt5 -i https://pypi.douban.com/simple # (- i https://pypi.douban.com/simple) mirror watercress
3. Install Qt5 graphic design tools
pip install PyQt5-tools -i https://pypi.douban.com/simple # Tools included (GUI development tools qt designer, translation tools liguist tools, etc.)
4. Add the environment variable pyqt5
