yarn install 安装依赖报错如下：

　　gyp ERR! find Python
　　gyp ERR! find Python Python is not set from command line or npm configuration

　　gyp ERR! find Python Python is not set from environment variable PYTHON
　　gyp ERR! find Python checking if \"python\" can be used
　　gyp ERR! find Python - executable path is \"C:\\Program Files\\Python37\\python.exe\"
　　gyp ERR! find Python - version is \"3.7.0\"
　　gyp ERR! find Python - version is 3.7.0 - should be >=2.6.0 <3.0.0

解决方法：

　　　　下载python2.7 安装即可