sass-loader 出现 gyp verb which failed Error:not found: python2 错误

 在使用 npm rebuild sass-loader 出现 gyp verb which failed Error:not found: python2 错误，通过设置 npm 环境变量

•   $ npm set SKIP_SASS_BINARY_DOWNLOAD_FOR_CI = true
• $ npm set SKIP_NODE_SASS_TESTS = true

然后重新npm rebuild sass-loader既可

来源：https://my.oschina.net/jamesview/blog/3131783