参考了论坛里面有关的帖子：
按照上面的步骤一步一来的，现在还是构建失败。是不是应为的python2 没有安装好
电脑系统：
报错信息：
Build Failed: Error: Can’t find python, please install python or check your environment
at ChildProcess. (/Applications/CocosCreator/Creator/2.4.5/CocosCreator.app/Contents/Resources/app.asar/editor/core/native-utils.ccc:1:3836)
at ChildProcess.emit (events.js:315:20)
at ChildProcess.emit (domain.js:483:12)
at Process.onexit (internal/child_process.js:273:12)
at onErrorNT (internal/child_process.js:469:16)
at processTicksAndRejections (internal/process/task_queues.js:84:21)
at /Applications/CocosCreator/Creator/2.4.5/CocosCreator.app/Contents/Resources/app.asar/editor/lib/builder/index.ccc:1:3950
at wrapper (/Applications/CocosCreator/Creator/2.4.5/CocosCreator.app/Contents/Resources/app.asar/node_modules/async/dist/async.js:272:20)
at next (/Applications/CocosCreator/Creator/2.4.5/CocosCreator.app/Contents/Resources/app.asar/node_modules/async/dist/async.js:4584:24)
at /Applications/CocosCreator/Creator/2.4.5/CocosCreator.app/Contents/Resources/app.asar/node_modules/async/dist/async.js:325:20
at /Applications/CocosCreator/Creator/2.4.5/CocosCreator.app/Contents/Resources/app.asar/editor/core/gulp-build.ccc:1:5879
at Gulp. (/Applications/CocosCreator/Creator/2.4.5/CocosCreator.app/Contents/Resources/app.asar/editor/core/gulp-build.ccc:1:26733)
at Object.onceWrapper (events.js:422:26)
at Gulp.emit (events.js:315:20)
at Gulp.emit (domain.js:483:12)