解决Unity安装Firebase后找不到Python的问题

Unity提示：

Could not find a working python interpreter. Please make sure one of the following is in your PATH: python3 python3.8 python3.7 python2.7 python2 python

安装了python后，还要把所有Unity编辑器关闭，最好Hud也关了。再重新打开就好了。